• 復健-搜索（10/14）

    代碼水平下降嚴重，注意：Simple is Beautiful

    10/14

    缺：POJ 3984 HDU 1241 HDU 1495 HDU 2612

    ---POJ1321（n皇后衍生）

    模板題 1A

     1 #define LOCAL
 2 #include <cstring>
 3 #include <iostream>
 4 #include <sstream>
 5 #include <fstream>
 6 #include <string>
 7 #include <vector>
 8 #include <deque>
 9 #include <queue>
10 #include <stack>
11 #include <set>
12 #include <map>
13 #include <algorithm>
14 #include <functional>
15 #include <utility>
16 #include <bitset>
17 #include <cmath>
18 #include <cstdlib>
19 #include <ctime>
20 #include <cstdio>
21 using namespace std;
22 #define X_mem(x,y,z) (X_mem[x][y][z] ? X_mem[x][y][z] :X_mem[x][y][z]=mem(x,y,z))
23 // X_INIT=0  mem_Macro
24 #define INF (1<<29)
25 #define MOD 1000000007ll
26 #define FOR(i,j,k) for(int i=j;i<=k;i++)
27 #define FORD(i,j,k) for(int i=j;i>=k;i--)
28 #define LL long long
29 #define SZ(x) int(x.size())
30 #define pb push_back
31 #define maxn 10
32 char a[maxn][maxn];
33 int n,k,sum; 
34 int vis[maxn];
35 void dfs(int depth,int num){
36     if(n-depth+1<num) return;    
37     if(num==0) {sum++; return;}
38     FOR(i,1,n)
39     if(a[depth][i]=='#'&&vis[i]==0) {vis[i]=1;dfs(depth+1,num-1);vis[i]=0;}    
40     dfs(depth+1,num);
41     return;
42 }
43 int main(){
44 #ifdef LOCAL
45 freopen("input.txt","r",stdin);
46 freopen("output.txt","w",stdout);
47 #endif
48 while(true){
49     
50     cin>>n>>k;
51     //cout<<n<<k;
52     if(n==-1&&k==-1) break; 
53     FOR(i,1,n)
54     FOR(j,1,n)
55     cin>>a[i][j];
56     FOR(i,1,n)
57     vis[i]=0;
58     sum=0;
59     dfs(1,k);
60     cout<<sum<<endl;
61 }
62 #ifdef LOCAL
63 fclose(stdin);
64 fclose(stdout);
65 #endif
66 //system(pause);
67 return 0;
68 }
    原始ac碼

    改進：

    定義個char[][]然後讀入時候可以直接%s，char[]。一次讀一行

    ---POJ2251（三維走迷宮）

    模板題 3OLE 1A

    *「將bfs的深度與棧分離，以便進行剪枝，用vis儲存（要初始化區別0與未賦值！！！），一舉兩用」

      1 //#define LOCAL
  2 #include <cstring>
  3 #include <iostream>
  4 #include <sstream>
  5 #include <fstream>
  6 #include <string>
  7 #include <vector>
  8 #include <deque>
  9 #include <queue>
 10 #include <stack>
 11 #include <set>
 12 #include <map>
 13 #include <algorithm>
 14 #include <functional>
 15 #include <utility>
 16 #include <bitset>
 17 #include <cmath>
 18 #include <cstdlib>
 19 #include <ctime>
 20 #include <cstdio>
 21 using namespace std;
 22 #define X_mem(x,y,z) (X_mem[x][y][z] ? X_mem[x][y][z] :X_mem[x][y][z]=mem(x,y,z))
 23 // X_INIT=0  mem_Macro
 24 #define INF (1<<29)
 25 #define MOD 1000000007ll
 26 #define FOR(i,j,k) for(int i=j;i<=k;i++)
 27 #define FORD(i,j,k) for(int i=j;i>=k;i--)
 28 #define LL long long
 29 #define SZ(x) int(x.size())
 30 #define pb push_back
 31 #define maxn 40
 32 #define maxm 40
 33 #define maxd 40
 34 char a[maxd][maxn][maxm];
 35 //int vis[maxd][maxn][maxm];
 36 int dd[]={0,0,0,0,1,-1};
 37 int di[]={1,-1,0,0,0,0};
 38 int dj[]={0,0,1,-1,0,0};
 39 int n,m,k,si,sj,sd,ans;
 40 bool flag;
 41 struct dot{
 42     int d1,d2,d3,d4;
 43 };
 44 void bfs(int de,int i,int j){
 45     queue<dot> Q;
 46     dot kkk;
 47     kkk.d1=de;
 48     kkk.d2=i;
 49     kkk.d3=j;
 50     kkk.d4=0;
 51     Q.push(kkk);
 52     int xx,yy,zz;
 53     int xx1,yy1,zz1,dd1;
 54     while(!Q.empty()){
 55     xx1=(Q.front()).d1;
 56     yy1=(Q.front()).d2;
 57     zz1=(Q.front()).d3;
 58     dd1=(Q.front()).d4;
 59     Q.pop();
 60     FOR(i,0,5){
 61         xx=xx1+dd[i];
 62         yy=yy1+di[i];
 63         zz=zz1+dj[i];
 64         if(1<=xx&&xx<=k)
 65         if(1<=yy&&yy<=n)
 66         if(1<=zz&&zz<=m){
 67             if(a[xx][yy][zz]=='E'){flag=true;ans=dd1+1;return;}
 68             if(a[xx][yy][zz]=='.'){
 69                 a[xx][yy][zz]='#';
 70                 kkk.d1=xx;
 71                 kkk.d2=yy;
 72                 kkk.d3=zz;
 73                 kkk.d4=dd1+1;
 74                 //cout<<xx<<' '<<yy<<' '<<zz<<' '<<dd1+1<<endl;
 75                 //0system("pause");    
 76                 Q.push(kkk);
 77             }
 78         }
 79     }
 80     }
 81     return;
 82 }
 83 int main(){
 84 #ifdef LOCAL
 85 freopen("input.txt","r",stdin);
 86 freopen("output.txt","w",stdout);
 87 #endif
 88 char sp;
 89 while(true){
 90     //scanf("%d%d%d",&k,&n,&m);
 91     cin>>k>>n>>m;
 92     if(k==0) return 0;
 93     //cout<<'*'<<k<<n<<m;
 94     FOR(p,1,k){
 95         FOR(i,1,n)
 96         FOR(j,1,m)
 97         {/*vis[p][i][j]=0;*//*scanf("%c",&a[p][i][j]);*/cin>>a[p][i][j]; if(a[p][i][j]=='S'){sd=p;si=i;sj=j;}}
 98     //cin>>sp;    
 99     }
100     flag=false;
101     a[sd][si][sj]='#'; bfs(sd,si,sj);
102     //if(flag) printf("Escaped in %d minute(s).
",ans); else printf("Trapped!
");
103     if(flag)
104      cout << "Escaped in " << ans << " minute(s)." << endl;
105         else
106             cout << "Trapped!" << endl;
107 }
108 #ifdef LOCAL
109 fclose(stdin);
110 fclose(stdout);
111 #endif
112 //system(pause);
113 return 0;
114 }
    ys

    改進：輸入輸出一律同標準，最好scanf

    ---POJ 3278（一個遞歸）

    加强模板 1TLE 3MLE 4WA 1A

     1 //#define LOCAL
 2 #include <cstring>
 3 #include <iostream>
 4 #include <sstream>
 5 #include <fstream>
 6 #include <string>
 7 #include <vector>
 8 #include <deque>
 9 #include <queue>
10 #include <stack>
11 #include <set>
12 #include <map>
13 #include <algorithm>
14 #include <functional>
15 #include <utility>
16 #include <bitset>
17 #include <cmath>
18 #include <cstdlib>
19 #include <ctime>
20 #include <cstdio>
21 using namespace std;
22 #define maxn 100010
23 #define X_mem(x,y,z) (X_mem[x][y][z] ? X_mem[x][y][z] :X_mem[x][y][z]=mem(x,y,z))
24 // X_INIT=0  mem_Macro
25 #define INF (1<<29)
26 #define MOD 1000000007ll
27 #define FOR(i,j,k) for(int i=j;i<=k;i++)
28 #define FORD(i,j,k) for(int i=j;i>=k;i--)
29 #define LL long long
30 #define SZ(x) int(x.size())
31 #define pb push_back
32 //int a[maxn];
33 int n,k;
34 int vis[maxn];
35 void bfs(){
36     queue< pair<int,int> > Q;
37     pair<int,int> kkk;
38     kkk.first=n;
39     kkk.second=0;
40     Q.push(kkk);
41     while(true){
42         int o=(Q.front()).first;
43         int p=(Q.front()).second;
44         Q.pop();
45         if(!vis[o]){
46             vis[o]=1;
47         if(o==k){cout<<p; return;}
48         if(o*2<=maxn){kkk.first=o*2;kkk.second=p+1;    Q.push(kkk);}
49         if(o+1<=maxn){kkk.first=o+1;kkk.second=p+1;    Q.push(kkk);}
50         if(o-1>=0){kkk.first=o-1;kkk.second=p+1;    Q.push(kkk);}}
51     }
52     return;
53 }
54 int main(){
55 #ifdef LOCAL
56 freopen("input.txt","r",stdin);
57 freopen("output.txt","w",stdout);
58 #endif
59 cin>>n>>k;
60 bfs();
61 #ifdef LOCAL
62 fclose(stdin);
63 fclose(stdout);
64 #endif
65 //system(pause);
66 return 0;
67 }
    ys

     改進：先要確定我們需要剪枝的是那一部分，再下if 而這題我們需要剪掉的是賦值部分，應在賦值部分對vis[]進行判斷

    *偶然看到的神仙代碼：https://vjudge.net/solution/22398005

    ---POJ 3279（奶牛黑白棋）

      1 //#define LOCAL
  2 #include <cstring>
  3 #include <iostream>
  4 #include <sstream>
  5 #include <fstream>
  6 #include <string>
  7 #include <vector>
  8 #include <deque>
  9 #include <queue>
 10 #include <stack>
 11 #include <set>
 12 #include <map>
 13 #include <algorithm>
 14 #include <functional>
 15 #include <utility>
 16 #include <bitset>
 17 #include <cmath>
 18 #include <cstdlib>
 19 #include <ctime>
 20 #include <cstdio>
 21 using namespace std;
 22 #define X_mem(x,y,z) (X_mem[x][y][z] ? X_mem[x][y][z] :X_mem[x][y][z]=mem(x,y,z))
 23 // X_INIT=0  mem_Macro
 24 #define INF (1<<29)
 25 #define MOD 1000000007ll
 26 #define FOR(i,j,k) for(int i=j;i<=k;i++)
 27 #define FORD(i,j,k) for(int i=j;i>=k;i--)
 28 #define LL long long
 29 #define SZ(x) int(x.size())
 30 #define pb push_back
 31 #define maxn 20
 32 int m,n; int ansx;
 33 int dx[]={-1,1,0,0,0};
 34 int dy[]={0,0,-1,1,0};
 35 bool a[maxn][maxn],c[maxn][maxn];
 36 bool tmp[maxn];
 37 int tmp2[maxn][maxn];
 38 int sum,ans;
 39 void color(int xx,int yy){
 40     int xxx,yyy;
 41     FOR(i,0,4){
 42         xxx=xx+dx[i];
 43         yyy=yy+dy[i];
 44         if(1<=xxx&&xxx<=m)    
 45         if(1<=yyy&&yyy<=n)
 46         {if(a[xxx][yyy])a[xxx][yyy]=0; else a[xxx][yyy]=1;}    
 47     }
 48     
 49 }
 50 int check(){
 51     FOR(i,1,n)
 52     if(a[m][i]==1) return 0;
 53     return 1;
 54 }
 55 
 56 int dfs(int depth){
 57     if (depth==m) return check();
 58     int sum=0;
 59     FOR(i,1,n)
 60     if(a[depth-1][i]==1) {color(depth,i);sum++;tmp2[depth][i]=1;}
 61      int ans=dfs(depth+1);
 62     FOR(i,1,n)
 63     if(tmp2[depth][i]) color(depth,i);
 64     if (ans==-1) return -1; else return ans+sum;    
 65 }
 66 void pri(int x){
 67     FOR(j,0,n-1)
 68     tmp[n-j]=(x>>j)&1;
 69     FOR(i,1,n-1)
 70     cout<<tmp[i]<<' ';
 71     cout<<tmp[n]<<endl;
 72     FOR(j,1,n)
 73     if(tmp[j]) color(1,j);
 74          
 75     FOR(i,2,m){
 76     FOR(j,1,n-1) if (a[i-1][j]) {color(i,j);cout<<1<<' ';} else cout<<0<<' ';
 77     if (a[i-1][n]) {color(i,n);cout<<1<<endl;} else cout<<0<<endl;
 78     }
 79     //FOR(i,1,n-1)
 80     //cout<<0<<' ';
 81     //cout<<0<<endl;
 82 }
 83 int main(){
 84 #ifdef LOCAL
 85 freopen("input.txt","r",stdin);
 86 freopen("output.txt","w",stdout);
 87 #endif
 88 cin>>m>>n;
 89 FOR(i,1,m)
 90 FOR(j,1,n)
 91 cin>>c[i][j];
 92 int s=(1<<n)-1;
 93 int min=1000000000;
 94 int minn;
 95 bool flag=false;
 96 FOR(i,0,s){
 97     sum=0;
 98     FOR(j,0,n-1)
 99     tmp[n-j]=(i>>j)&1;
100     FOR(j,1,m)
101      FOR(k,1,n)
102      a[j][k]=c[j][k];
103     //FOR(j,1,n)
104     //cout<<tmp[j];
105     //cout<<"********";
106     //cout<<endl;
107     
108     FOR(j,1,n)    if(tmp[j]==1) {color(1,j);sum++;}
109     FOR(j,2,m) 
110     FOR(k,1,n)
111     if(a[j-1][k])  {color(j,k);sum++;}
112 
113     //ansx=sum+dfs(2);
114     //cout<<i<<' '<<ansx-sum<<endl;
115     
116     if(check()){
117         if(min>sum) {min=sum; minn=i;}
118         flag=true;
119     }
120     //FOR(j,1,n)
121     //if(tmp[j]) color(1,j);
122     /*FOR(j,1,m)
123     {
124     FOR(k,1,n)
125     cout<<a[j][k];
126     cout<<endl;}*/
127     //if(flag) pri(minn);
128 }
129     FOR(j,1,m)
130      FOR(k,1,n)
131      a[j][k]=c[j][k];
132 //cout<<min<<' '<<minn;
133 if(flag) pri(minn);
134 else cout<<"IMPOSSIBLE"<<endl;
135 #ifdef LOCAL
136 fclose(stdin);
137 fclose(stdout);
138 #endif
139 //system(pause);
140 return 0;
141 }
    ys

    *偶然看到的神仙代碼：https://vjudge.net/solution/21754430

    *改進：我們根據保存的路徑就可以直接推斷圖中反轉的狀態，省去了修改原圖的麻煩

    ---POJ 1426（01構造數（模意義））

    當帶模dp做了，wa到飛（必須保證每次轉移不能覆蓋當前操作）不然會無限風怒風怒，GG

    提前處理個10^n的模p

      1 //#define LOCAL
  2 #include <cstring>
  3 #include <iostream>
  4 #include <sstream>
  5 #include <fstream>
  6 #include <string>
  7 #include <vector>
  8 #include <deque>
  9 #include <queue>
 10 #include <stack>
 11 #include <set>
 12 #include <map>
 13 #include <algorithm>
 14 #include <functional>
 15 #include <utility>
 16 #include <bitset>
 17 #include <cmath>
 18 #include <cstdlib>
 19 #include <ctime>
 20 #include <cstdio>
 21 using namespace std;
 22 #define X_mem(x,y,z) (X_mem[x][y][z] ? X_mem[x][y][z] :X_mem[x][y][z]=mem(x,y,z))
 23 // X_INIT=0  mem_Macro
 24 #define INF (1<<29)
 25 #define MOD 1000000007ll
 26 #define FOR(i,j,k) for(int i=j;i<=k;i++)
 27 #define FORD(i,j,k) for(int i=j;i>=k;i--)
 28 #define LL long long
 29 #define SZ(x) int(x.size())
 30 #define pb push_back
 31 #define maxn 1000
 32 int n,j;
 33 int dp[maxn],q[maxn],m[maxn];
 34 void outr(int x){
 35     cout<<1;
 36     FOR(i,1,x-1)
 37     cout<<0;
 38     cout<<endl;
 39 }
 40 void outy(){
 41     //cout<<"*";
 42     int jj=0;
 43     int kk=0;
 44     vector<int> xx;
 45     //xx.pb(1);
 46     do{
 47         kk++;
 48         xx.pb(dp[jj]);
 49         //cout<<jj<<' '<<q[jj]<<' '<<dp[jj]<<endl;
 50         jj=q[jj];
 51     }while(jj!=0);
 52     //cout<<kk;
 53     //xx.pb(1);
 54     //kk++; 
 55     //FOR(i,0,kk-1)
 56     //cout<<xx[i]<<' ';
 57     //cout<<endl;
 58     //cout<<kk;
 59     FOR(i,0,kk-2){
 60         cout<<1;
 61         //cout<<xx[i]-xx[i+1]-1<<endl;
 62         FOR(jj,1,xx[i]-xx[i+1]-1)
 63             cout<<0;
 64     }
 65     if(xx[kk-1]!=1) {cout<<1; FORD(i,xx[kk-1]-1,1) cout<<0;} else cout<<1;
 66     cout<<endl;
 67 }
 68 void zy(int aa,int bb,int cc){
 69     if(aa==0) if(j<=3) return;
 70     dp[aa]=bb;
 71     q[aa]=cc;
 72     return;
 73 }
 74 int main(){
 75 #ifdef LOCAL
 76 freopen("input.txt","r",stdin);
 77 freopen("output.txt","w",stdout);
 78 #endif
 79 n=201;
 80 while(true){
 81     cin>>n;
 82     //n--;
 83     if(n==0) return 0;
 84     m[1]=1;
 85     int f=-1;
 86     FOR(i,2,100)
 87     {m[i]=(m[i-1]*10)%n;if(m[i]==0&&i>3) {f=i;break;}}
 88     //cout<<f<<endl;
 89     if(f!=-1) outr(f);
 90     else{
 91     FOR(i,0,210)
 92     {dp[i]=0;q[i]=0;}
 93     j=0;
 94     while(true){
 95         j++;
 96         FORD(i,n,1)
 97         if(dp[i]!=0) if(dp[i]!=j) if(dp[(i+m[j])%n]==0) zy((i+m[j])%n,j,i);
 98         if(dp[m[j]]==0) if(dp[0]!=j) zy(m[j],j,0);
 99         if(q[0]!=0)     {outy();break;}
100         //if(dp[i]!=0) if(dp[(i+m[j])%n]==0){dp[(i+m[j])%n]=j;q[(i+m[j])%n]=i;}
101         //if(dp[m[j]]==0){dp[m[j]]=j;q[m[j]]=0;}
102         //if(q[0]!=0){     if(dp[0]>3){outy();break;}else{dp[0]=0;q[0]=0;}}
103     }}
104 }
105 
106 #ifdef LOCAL
107 fclose(stdin);
108 fclose(stdout);
109 #endif
110 //system(pause);
111 return 0;
112 }
    ys

    *偶然看到的神仙代碼：https://vjudge.net/solution/22468052

    所以說哪來的這些神仙，慌都不慌直接搜索的。。。

    ---POJ 3126(改变数位从一个素数到另一个素数)

    BFS什麼時候都能直接跳出真方便

     1 #include<iostream>
 2 #include<algorithm>
 3 #include<set>
 4 #include<cstdio>
 5 #include<cstdlib>
 6 #include<cmath>
 7 #include<queue>
 8 using namespace std;
 9 #define FOR(i,j,k) for(int i=j;i<=k;i++)
10 #define FORD(i,j,k) for(int i=j;i>=k;i--)
11 #define LL long long
12 #define SZ(x) x.size()
13 int a[]={1009,1013,1019,1021,1031,1033,1039,1049,1051,1061,1063,1069,1087,1091,1093,1097,1103,1109,1117,1123,1129,1151,1153,1163,1171,1181,1187,1193,1201,1213,1217,1223,1229,1231,1237,1249,1259,1277,1279,1283,1289,1291,1297,1301,1303,1307,1319,1321,1327,1361,1367,1373,1381,1399,1409,1423,1427,1429,1433,1439,1447,1451,1453,1459,1471,1481,1483,1487,1489,1493,1499,1511,1523,1531,1543,1549,1553,1559,1567,1571,1579,1583,1597,1601,1607,1609,1613,1619,1621,1627,1637,1657,1663,1667,1669,1693,1697,1699,1709,1721,1723,1733,1741,1747,1753,1759,1777,1783,1787,1789,1801,1811,1823,1831,1847,1861,1867,1871,1873,1877,1879,1889,1901,1907,1913,1931,1933,1949,1951,1973,1979,1987,1993,1997,1999,2003,2011,2017,2027,2029,2039,2053,2063,2069,2081,2083,2087,2089,2099,2111,2113,2129,2131,2137,2141,2143,2153,2161,2179,2203,2207,2213,2221,2237,2239,2243,2251,2267,2269,2273,2281,2287,2293,2297,2309,2311,2333,2339,2341,2347,2351,2357,2371,2377,2381,2383,2389,2393,2399,2411,2417,2423,2437,2441,2447,2459,2467,2473,2477,2503,2521,2531,2539,2543,2549,2551,2557,2579,2591,2593,2609,2617,2621,2633,2647,2657,2659,2663,2671,2677,2683,2687,2689,2693,2699,2707,2711,2713,2719,2729,2731,2741,2749,2753,2767,2777,2789,2791,2797,2801,2803,2819,2833,2837,2843,2851,2857,2861,2879,2887,2897,2903,2909,2917,2927,2939,2953,2957,2963,2969,2971,2999,3001,3011,3019,3023,3037,3041,3049,3061,3067,3079,3083,3089,3109,3119,3121,3137,3163,3167,3169,3181,3187,3191,3203,3209,3217,3221,3229,3251,3253,3257,3259,3271,3299,3301,3307,3313,3319,3323,3329,3331,3343,3347,3359,3361,3371,3373,3389,3391,3407,3413,3433,3449,3457,3461,3463,3467,3469,3491,3499,3511,3517,3527,3529,3533,3539,3541,3547,3557,3559,3571,3581,3583,3593,3607,3613,3617,3623,3631,3637,3643,3659,3671,3673,3677,3691,3697,3701,3709,3719,3727,3733,3739,3761,3767,3769,3779,3793,3797,3803,3821,3823,3833,3847,3851,3853,3863,3877,3881,3889,3907,3911,3917,3919,3923,3929,3931,3943,3947,3967,3989,4001,4003,4007,4013,4019,4021,4027,4049,4051,4057,4073,4079,4091,4093,4099,4111,4127,4129,4133,4139,4153,4157,4159,4177,4201,4211,4217,4219,4229,4231,4241,4243,4253,4259,4261,4271,4273,4283,4289,4297,4327,4337,4339,4349,4357,4363,4373,4391,4397,4409,4421,4423,4441,4447,4451,4457,4463,4481,4483,4493,4507,4513,4517,4519,4523,4547,4549,4561,4567,4583,4591,4597,4603,4621,4637,4639,4643,4649,4651,4657,4663,4673,4679,4691,4703,4721,4723,4729,4733,4751,4759,4783,4787,4789,4793,4799,4801,4813,4817,4831,4861,4871,4877,4889,4903,4909,4919,4931,4933,4937,4943,4951,4957,4967,4969,4973,4987,4993,4999,5003,5009,5011,5021,5023,5039,5051,5059,5077,5081,5087,5099,5101,5107,5113,5119,5147,5153,5167,5171,5179,5189,5197,5209,5227,5231,5233,5237,5261,5273,5279,5281,5297,5303,5309,5323,5333,5347,5351,5381,5387,5393,5399,5407,5413,5417,5419,5431,5437,5441,5443,5449,5471,5477,5479,5483,5501,5503,5507,5519,5521,5527,5531,5557,5563,5569,5573,5581,5591,5623,5639,5641,5647,5651,5653,5657,5659,5669,5683,5689,5693,5701,5711,5717,5737,5741,5743,5749,5779,5783,5791,5801,5807,5813,5821,5827,5839,5843,5849,5851,5857,5861,5867,5869,5879,5881,5897,5903,5923,5927,5939,5953,5981,5987,6007,6011,6029,6037,6043,6047,6053,6067,6073,6079,6089,6091,6101,6113,6121,6131,6133,6143,6151,6163,6173,6197,6199,6203,6211,6217,6221,6229,6247,6257,6263,6269,6271,6277,6287,6299,6301,6311,6317,6323,6329,6337,6343,6353,6359,6361,6367,6373,6379,6389,6397,6421,6427,6449,6451,6469,6473,6481,6491,6521,6529,6547,6551,6553,6563,6569,6571,6577,6581,6599,6607,6619,6637,6653,6659,6661,6673,6679,6689,6691,6701,6703,6709,6719,6733,6737,6761,6763,6779,6781,6791,6793,6803,6823,6827,6829,6833,6841,6857,6863,6869,6871,6883,6899,6907,6911,6917,6947,6949,6959,6961,6967,6971,6977,6983,6991,6997,7001,7013,7019,7027,7039,7043,7057,7069,7079,7103,7109,7121,7127,7129,7151,7159,7177,7187,7193,7207,7211,7213,7219,7229,7237,7243,7247,7253,7283,7297,7307,7309,7321,7331,7333,7349,7351,7369,7393,7411,7417,7433,7451,7457,7459,7477,7481,7487,7489,7499,7507,7517,7523,7529,7537,7541,7547,7549,7559,7561,7573,7577,7583,7589,7591,7603,7607,7621,7639,7643,7649,7669,7673,7681,7687,7691,7699,7703,7717,7723,7727,7741,7753,7757,7759,7789,7793,7817,7823,7829,7841,7853,7867,7873,7877,7879,7883,7901,7907,7919,7927,7933,7937,7949,7951,7963,7993,8009,8011,8017,8039,8053,8059,8069,8081,8087,8089,8093,8101,8111,8117,8123,8147,8161,8167,8171,8179,8191,8209,8219,8221,8231,8233,8237,8243,8263,8269,8273,8287,8291,8293,8297,8311,8317,8329,8353,8363,8369,8377,8387,8389,8419,8423,8429,8431,8443,8447,8461,8467,8501,8513,8521,8527,8537,8539,8543,8563,8573,8581,8597,8599,8609,8623,8627,8629,8641,8647,8663,8669,8677,8681,8689,8693,8699,8707,8713,8719,8731,8737,8741,8747,8753,8761,8779,8783,8803,8807,8819,8821,8831,8837,8839,8849,8861,8863,8867,8887,8893,8923,8929,8933,8941,8951,8963,8969,8971,8999,9001,9007,9011,9013,9029,9041,9043,9049,9059,9067,9091,9103,9109,9127,9133,9137,9151,9157,9161,9173,9181,9187,9199,9203,9209,9221,9227,9239,9241,9257,9277,9281,9283,9293,9311,9319,9323,9337,9341,9343,9349,9371,9377,9391,9397,9403,9413,9419,9421,9431,9433,9437,9439,9461,9463,9467,9473,9479,9491,9497,9511,9521,9533,9539,9547,9551,9587,9601,9613,9619,9623,9629,9631,9643,9649,9661,9677,9679,9689,9697,9719,9721,9733,9739,9743,9749,9767,9769,9781,9787,9791,9803,9811,9817,9829,9833,9839,9851,9857,9859,9871,9883,9887,9901,9907,9923,9929,9931,9941,9949,9967,9973};
14 int p[10000],vis[10000];
15 int k,n,m,s,ans;
16 int bfs()
17 {
18     queue<int> q1,q2;
19     q1.push(n);
20     q2.push(1);
21     while(q1.front()!=m)
22     {
23         int fr=q1.front();
24         int fv=q2.front();
25         int shi=1;
26         vis[fr]=1;
27         FOR(i,1,4)
28         {
29             ans=fr/(shi*10)*(shi*10)+fr%shi;
30             if(i!=4) s=0; else s=1;
31             FOR(j,s,9)    if(p[ans+shi*j]) if(!vis[ans+shi*j]) {q1.push(ans+shi*j); q2.push(fv+1);vis[ans+shi*j]=1;}
32             shi*=10;
33         }
34         q1.pop();
35         q2.pop();
36     }
37     return q2.front()-1;
38 }
39 int main()
40 {
41 FOR(i,0,1060)
42 p[a[i]]=1;
43 cin>>k;
44 FOR(i,1,k)
45 {
46 cin>>n>>m;
47 FOR(i,1000,9999)
48 vis[i]=0;
49 cout<<bfs()<<endl;
50 }
51 return 0;
52 }
    ys

    ---POJ 3087(洗牌)

    爲啥有人會拿搜索過這題。。。絕了。。。顯然操作是個環，所以就直接模擬了

     1 //#define LOCAL
 2 #include <cstring>
 3 #include <iostream>
 4 #include <sstream>
 5 #include <fstream>
 6 #include <string>
 7 #include <vector>
 8 #include <deque>
 9 #include <queue>
10 #include <stack>
11 #include <set>
12 #include <map>
13 #include <algorithm>
14 #include <functional>
15 #include <utility>
16 #include <bitset>
17 #include <cmath>
18 #include <cstdlib>
19 #include <ctime>
20 #include <cstdio>
21 using namespace std;
22 #define X_mem(x,y,z) (X_mem[x][y][z] ? X_mem[x][y][z] :X_mem[x][y][z]=mem(x,y,z))
23 // X_INIT=0  mem_Macro
24 #define INF (1<<29)
25 #define MOD 1000000007ll
26 #define FOR(i,j,k) for(int i=j;i<=k;i++)
27 #define FORD(i,j,k) for(int i=j;i>=k;i--)
28 #define LL long long
29 #define SZ(x) int(x.size())
30 #define pb push_back
31 int n,c,l,flag,sum;
32 char s1[220],s2[220],s3[220],t[220];
33 bool check1(){
34     FOR(i,1,2*l)
35     if(s3[i]!=t[i]) return false;
36     return true;
37 } 
38 bool check2(){
39     FOR(i,1,2*l)
40     if(s1[i]!=t[i]) return false;
41     return true;
42 } 
43 int main(){
44 #ifdef LOCAL
45 freopen("input.txt","r",stdin);
46 freopen("output.txt","w",stdout);
47 #endif
48 cin>>n;
49 FOR(i,1,n){
50     cin>>l;
51     FOR(j,1,2*l)
52     cin>>s1[j];
53     FOR(j,1,2*l){
54     s2[j]=s1[j];t[j]=s2[j];}
55     FOR(j,1,2*l)
56     cin>>s3[j];
57     sum=0;
58     flag=true;
59     do{
60         FOR(j,1,2*l)
61         s2[j]=t[j];
62         sum++;
63         FOR(j,1,l){
64             t[2*j-1]=s2[l+j];
65             t[2*j]=s2[j];
66         }
67         //FOR(j,1,2*l)
68         //cout<<s2[j];
69         //cout<<endl;
70         //FOR(j,1,2*l)
71         //cout<<t[j];
72         //cout<<endl;
73         if(check1()) {flag=false;break;}
74         if(check2()) break;    
75     }while(true);
76     if(!flag) cout<<i<<' '<<sum<<endl;
77     else cout<<i<<' '<<-1<<endl;
78 }
79 #ifdef LOCAL
80 fclose(stdin);
81 fclose(stdout);
82 #endif
83 //system(pause);
84 return 0;
85 }
    ys

    對了，還是要罵一句，傻逼題面，wqnmlgb

    ---POJ 3414(倒水問題)

    是大模擬誒，思路清晰就好了

      1 //#define LOCAL
  2 #include <cstring>
  3 #include <iostream>
  4 #include <sstream>
  5 #include <fstream>
  6 #include <string>
  7 #include <vector>
  8 #include <deque>
  9 #include <queue>
 10 #include <stack>
 11 #include <set>
 12 #include <map>
 13 #include <algorithm>
 14 #include <functional>
 15 #include <utility>
 16 #include <bitset>
 17 #include <cmath>
 18 #include <cstdlib>
 19 #include <ctime>
 20 #include <cstdio>
 21 using namespace std;
 22 #define X_mem(x,y,z) (X_mem[x][y][z] ? X_mem[x][y][z] :X_mem[x][y][z]=mem(x,y,z))
 23 // X_INIT=0  mem_Macro
 24 #define INF (1<<29)
 25 #define MOD 1000000007ll
 26 #define FOR(i,j,k) for(int i=j;i<=k;i++)
 27 #define FORD(i,j,k) for(int i=j;i>=k;i--)
 28 #define LL long long
 29 #define SZ(x) int(x.size())
 30 #define pb push_back
 31 #define maxn 110
 32 int a,b,c;
 33 int t,t1,t2;
 34 int vis[maxn+1][maxn+1];
 35 pair<int,int>pre[maxn+1][maxn+1];
 36 string doi[maxn+1][maxn+1];
 37 
 38 struct node{
 39     int l,r;
 40     int depth;
 41 };
 42 queue<node> Q;
 43 void putin(node x){
 44     x.depth++;
 45     Q.push(x);
 46     vis[x.l][x.r]=x.depth;
 47     x.depth--;
 48     return;
 49 }
 50 void prin(int xx,int yy){
 51     cout<<vis[xx][yy]<<endl;
 52     stack<string> SS;
 53     int pxx;
 54     int pyy;
 55     while(xx!=0||yy!=0){
 56         SS.push(doi[xx][yy]);
 57         pxx=pre[xx][yy].first;
 58         pyy=pre[xx][yy].second;
 59         xx=pxx;
 60         yy=pyy;
 61         //cout<<xx<<' '<<yy<<endl;
 62     }
 63     //int o;
 64     while(!SS.empty())
 65     {
 66         cout<<SS.top()<<endl;
 67         SS.pop();
 68         //cout<<++o;
 69     }
 70     return;
 71 }
 72 int check(){
 73     FOR(i,0,b)
 74     if(vis[c][i]!=INF){prin(c,i);return 1;}
 75     FOR(i,0,a)
 76     if(vis[i][c]!=INF){prin(i,c);return 1;}
 77     return 0;
 78 }
 79 void bfs(){
 80     node kkk;kkk.l=0;kkk.r=0;kkk.depth=0;
 81     vis[a][b]=0;
 82     while(!Q.empty())
 83     Q.pop();
 84     Q.push(kkk);
 85     while(!Q.empty()){
 86         kkk=Q.front();
 87         Q.pop();
 88         //fill
 89         if(kkk.l!=a){t=kkk.l;kkk.l=a;
 90         if(vis[kkk.l][kkk.r]==INF) {putin(kkk);pre[kkk.l][kkk.r].first=t;pre[kkk.l][kkk.r].second=kkk.r;doi[kkk.l][kkk.r]="FILL(1)";}
 91         kkk.l=t;}
 92         if(kkk.r!=b){t=kkk.r;kkk.r=b;
 93         if(vis[kkk.l][kkk.r]==INF) {putin(kkk);pre[kkk.l][kkk.r].first=kkk.l;pre[kkk.l][kkk.r].second=t;doi[kkk.l][kkk.r]="FILL(2)";}
 94         kkk.r=t;}
 95         //drop
 96         if(kkk.l!=0){t=kkk.l;kkk.l=0;
 97         if(vis[kkk.l][kkk.r]==INF) {putin(kkk);pre[kkk.l][kkk.r].first=t;pre[kkk.l][kkk.r].second=kkk.r;doi[kkk.l][kkk.r]="DROP(1)";}
 98         kkk.l=t;}
 99         if(kkk.r!=0){t=kkk.r;kkk.r=0;
100         if(vis[kkk.l][kkk.r]==INF) {putin(kkk);pre[kkk.l][kkk.r].first=kkk.l;pre[kkk.l][kkk.r].second=t;doi[kkk.l][kkk.r]="DROP(2)";}
101         kkk.r=t;}
102         //pour
103         if(kkk.r!=0)
104         {
105         if(kkk.l+kkk.r<=a){t1=kkk.l;t2=kkk.r;kkk.l+=kkk.r;kkk.r=0;
106         if(vis[kkk.l][kkk.r]==INF) {putin(kkk);pre[kkk.l][kkk.r].first=t1;pre[kkk.l][kkk.r].second=t2;doi[kkk.l][kkk.r]="POUR(2,1)";}
107         kkk.l=t1;kkk.r=t2;
108         }
109         else {t1=kkk.l;t2=kkk.r;kkk.l=a;kkk.r=t1+t2-a;
110         if(vis[kkk.l][kkk.r]==INF) {putin(kkk);pre[kkk.l][kkk.r].first=t1;pre[kkk.l][kkk.r].second=t2;doi[kkk.l][kkk.r]="POUR(2,1)";}
111         kkk.l=t1;kkk.r=t2;
112         }
113         }
114         if(kkk.l!=0)
115         {
116         if(kkk.l+kkk.r<=b){t1=kkk.l;t2=kkk.r;kkk.r+=kkk.l;kkk.l=0;
117         if(vis[kkk.l][kkk.r]==INF) {putin(kkk);pre[kkk.l][kkk.r].first=t1;pre[kkk.l][kkk.r].second=t2;doi[kkk.l][kkk.r]="POUR(1,2)";}
118         kkk.l=t1;kkk.r=t2;
119         }
120         else {t1=kkk.l;t2=kkk.r;kkk.r=b;kkk.l=t1+t2-b;
121         if(vis[kkk.l][kkk.r]==INF) {putin(kkk);pre[kkk.l][kkk.r].first=t1;pre[kkk.l][kkk.r].second=t2;doi[kkk.l][kkk.r]="POUR(1,2)";}
122         kkk.l=t1;kkk.r=t2;
123         }
124         }
125         //check
126         if(check()) return;
127     }
128     cout<<"impossible"<<endl;
129     return;
130 }
131 int main(){
132 #ifdef LOCAL
133 freopen("input.txt","r",stdin);
134 freopen("output.txt","w",stdout);
135 #endif
136 cin>>a>>b>>c;
137 FOR(i,0,maxn)
138 FOR(j,0,maxn)
139 //for(int i=0;i<=maxn;i++)
140 //for(int j=0;j<=maxn;j++)
141 vis[i][j]=INF;
142 bfs();
143 //cout<<vis[3][4];
144 #ifdef LOCAL
145 fclose(stdin);
146 fclose(stdout);
147 #endif
148 //system(pause);
149 return 0;
150 }
    ys

    *偶然看到的神仙代碼： https://vjudge.net/solution/22126182 

    啊，系神仙，我愛了（

    ---FZU 2150（雙起點bfs）

      1 //#define LOCAL
  2 #include <cstring>
  3 #include <iostream>
  4 #include <sstream>
  5 #include <fstream>
  6 #include <string>
  7 #include <vector>
  8 #include <deque>
  9 #include <queue>
 10 #include <stack>
 11 #include <set>
 12 #include <map>
 13 #include <algorithm>
 14 #include <functional>
 15 #include <utility>
 16 #include <bitset>
 17 #include <cmath>
 18 #include <cstdlib>
 19 #include <ctime>
 20 #include <cstdio>
 21 using namespace std;
 22 #define X_mem(x,y,z) (X_mem[x][y][z] ? X_mem[x][y][z] :X_mem[x][y][z]=mem(x,y,z))
 23 // X_INIT=0  mem_Macro
 24 #define INF (1<<29)
 25 #define MOD 1000000007ll
 26 #define FOR(i,j,k) for(int i=j;i<=k;i++)
 27 #define FORD(i,j,k) for(int i=j;i>=k;i--)
 28 #define LL long long
 29 #define SZ(x) int(x.size())
 30 #define pb push_back
 31 #define maxn 200
 32 #define maxm 15
 33 int dx[]={0,0,1,-1};
 34 int dy[]={1,-1,0,0};
 35 int k,n,m,minn,ans; 
 36 char a[maxm][maxm],c[maxm][maxm];
 37 int vis[maxm][maxm];
 38 queue<pair<int,int> > Q;
 39 int check(){
 40     int max=0;/*
 41     FOR(i,1,n){
 42     FOR(j,1,m)
 43     cout<<c[i][j];
 44     cout<<endl;}
 45     FOR(i,1,n){
 46     FOR(j,1,m)
 47     cout<<vis[i][j];
 48     cout<<endl;}*/
 49     FOR(i,1,n)
 50     FOR(j,1,m)
 51     {
 52     if(c[i][j]=='#') return -1;
 53     if(max<vis[i][j]) max=vis[i][j];
 54     }
 55     return max;
 56     
 57 }
 58 void init(){
 59     FOR(i,1,n)
 60     FOR(j,1,m)
 61     c[i][j]=a[i][j];
 62     FOR(i,1,n)
 63     FOR(j,1,m)
 64     vis[i][j]=-1;
 65     while(!Q.empty()) Q.pop();
 66     return;
 67 }
 68 int pbb(pair<int,int> l){
 69     int xx,yy;
 70     FOR(i,0,3)
 71     {
 72         xx=l.first+dx[i];
 73         yy=l.second+dy[i];
 74         if(1<=xx&&xx<=n)
 75         if(1<=yy&&yy<=m)
 76         if(c[xx][yy]=='#')
 77         if(vis[xx][yy]==-1) {c[xx][yy]='.'; vis[xx][yy]=vis[l.first][l.second]+1;Q.push(make_pair(xx,yy));}
 78     }
 79 }
 80 int bfs(pair<int,int> x1,pair<int,int> x2){
 81     init();
 82     pair<int,int> kkk;
 83     Q.push(x1);
 84     Q.push(x2);
 85     vis[x1.first][x1.second]=0;
 86     vis[x2.first][x2.second]=0;
 87     c[x1.first][x1.second]='.';
 88     c[x2.first][x2.second]='.';
 89     while(!Q.empty()){
 90         kkk=Q.front();
 91         Q.pop();
 92         pbb(kkk);
 93     }
 94     return check();
 95 } 
 96 int main(){
 97 #ifdef LOCAL
 98 freopen("input.txt","r",stdin);
 99 freopen("output.txt","w",stdout);
100 #endif
101 cin>>k;
102 vector<pair<int,int> > aa;
103 
104 FOR(i,1,k){
105     cin>>n>>m;
106     aa.clear();
107     FOR(j,1,n)
108     FOR(k,1,m)
109     {
110         cin>>a[j][k];
111         if(a[j][k]=='#') aa.pb(make_pair(j,k));
112     }
113     minn=100010;
114     ans=-1;
115     if(aa.size()==1) {cout<<"Case "<<i<<": "<<0<<endl;continue;}
116     for(vector<pair<int,int> >::iterator i2=aa.begin();i2!=aa.end();i2++)
117     for(vector<pair<int,int> >::iterator i3=i2+1;i3!=aa.end();i3++){
118         //if(i3==i2) continue;
119         ans=bfs(*i2,*i3);
120         if(ans!=-1&&ans<minn) minn=ans;
121     }
122     //if(minn!=100010) printf("Case %d: %d
",i,minn); else printf("Case %d: %d
",i,-1);
123     if(minn!=100010) cout<<"Case "<<i<<": "<<minn<<endl; else cout<<"Case "<<i<<": "<<-1<<endl;
124 }
125 #ifdef LOCAL
126 fclose(stdin);
127 fclose(stdout);
128 #endif
129 //system(pause);
130 return 0;
131 }
    ys

    可以提前處理掉需要燒掉的格子數，在搜索時記錄選定起點能夠燒掉格子的數量進行比對，這樣就可以把check()的環節剪掉

    ---Uva 11624 

      1 //#define LOCAL
  2 #include <cstring>
  3 #include <iostream>
  4 #include <sstream>
  5 #include <fstream>
  6 #include <string>
  7 #include <vector>
  8 #include <deque>
  9 #include <queue>
 10 #include <stack>
 11 #include <set>
 12 #include <map>
 13 #include <algorithm>
 14 #include <functional>
 15 #include <utility>
 16 #include <bitset>
 17 #include <cmath>
 18 #include <cstdlib>
 19 #include <ctime>
 20 #include <cstdio>
 21 using namespace std;
 22 #define X_mem(x,y,z) (X_mem[x][y][z] ? X_mem[x][y][z] :X_mem[x][y][z]=mem(x,y,z))
 23 // X_INIT=0  mem_Macro
 24 #define INF (1<<29)
 25 #define MOD 1000000007ll
 26 #define FOR(i,j,k) for(int i=j;i<=k;i++)
 27 #define FORD(i,j,k) for(int i=j;i>=k;i--)
 28 #define LL long long
 29 #define SZ(x) int(x.size())
 30 #define pb push_back
 31 #define maxn 1010 
 32 int dx[]={-1,1,0,0};
 33 int dy[]={0,0,1,-1};
 34 int k,n,m,xx,yy,ei,ej,si,sj,ans,cnn;
 35 bool flag;
 36 int vis[maxn][maxn],visj[maxn][maxn];
 37 char ma[maxn][maxn];
 38 struct node{
 39     int x,y,depth;
 40 };
 41 node kkk,t;
 42 queue<node> Q;
 43 void init(){
 44     FOR(i,0,n-1)
 45     FOR(j,0,m-1){
 46         vis[i][j]=-1;
 47         visj[i][j]=-1;
 48     }
 49     while(!Q.empty()) Q.pop(); 
 50     return;
 51 }
 52 void pbb(node cnt){
 53     FOR(i,0,3){
 54         //cout<<xx<<yy<<endl; 
 55     xx=cnt.x+dx[i];
 56     yy=cnt.y+dy[i];
 57     if(0<=xx&&xx<=n-1)
 58     if(0<=yy&&yy<=m-1)
 59     if(ma[xx][yy]=='.') 
 60     if(vis[xx][yy]==-1) {
 61         vis[xx][yy]=cnt.depth+1;
 62         t.x=xx;
 63         t.y=yy;
 64         t.depth=cnt.depth+1;
 65         Q.push(t);
 66     }
 67     }
 68 }
 69 void bfsf(){
 70     while(!Q.empty()){
 71         kkk=Q.front();
 72         Q.pop();
 73         pbb(kkk);
 74     }
 75 } 
 76 /*
 77 int check(){
 78     FOR(i,0,n-1)
 79     if(visj[i][0]!=-1) return visj[i][0];
 80     FOR(i,0,n-1)
 81     if(visj[i][m-1]!=-1) return visj[i][m-1];
 82     FOR(i,0,m-1)
 83     if(visj[0][i]!=-1) return visj[0][i];
 84     FOR(i,0,m-1)
 85     if(visj[n-1][i]!=-1) return visj[n-1][i];
 86     return -1;
 87 }*/
 88 void pbbj(node cnt){
 89     FOR(i,0,3){
 90     xx=cnt.x+dx[i];
 91     yy=cnt.y+dy[i];
 92     if(0<=xx&&xx<=n-1)
 93     if(0<=yy&&yy<=m-1)
 94     if(ma[xx][yy]=='.') 
 95     if(visj[xx][yy]==-1&&(cnt.depth+1<vis[xx][yy]||vis[xx][yy]==-1)) 
 96     {
 97         visj[xx][yy]=cnt.depth+1;
 98         t.x=xx;
 99         t.y=yy;
100         t.depth=cnt.depth+1;
101         if(xx==0||xx==n-1||yy==0||yy==m-1){flag=true;ei=xx;ej=yy;vis[xx][yy]=cnt.depth+1;} 
102         Q.push(t);
103     }
104     }
105 }
106 int bfsj(int a,int b){
107     kkk.x=a;kkk.y=b;kkk.depth=0;
108     flag=false;
109     visj[a][b]=0;
110     Q.push(kkk);
111     if(a==0||a==n-1||b==0||b==m-1) return 0;
112     while(!Q.empty()){
113         kkk=Q.front();
114         Q.pop();
115         pbbj(kkk);
116         //cnn=check();
117         if(flag) return visj[ei][ej];
118     }
119     return -1;
120 } 
121 
122 int main(){
123 #ifdef LOCAL
124 freopen("input.txt","r",stdin);
125 freopen("output.txt","w",stdout);
126 #endif
127 std::ios::sync_with_stdio(false);
128 //cin>>k;
129 scanf("%d",&k);
130 FOR(i,1,k){
131     //cin>>n>>m;
132     scanf("%d%d",&n,&m);
133     //cout<<n<<m;
134     init();    
135     FOR(j,0,n-1)
136         scanf("%s",&ma[j]);
137     FOR(j,0,n-1)
138     FOR(k,0,m-1){
139         //cin>>ma[j][k];
140         //ma[j][k]=getchar();
141         if(ma[j][k]=='F'){kkk.x=j;kkk.y=k;kkk.depth=0;Q.push(kkk);vis[j][k]=0;}
142         //{si=j;sj=k;}
143         if(ma[j][k]=='J') {si=j;sj=k;}
144     }
145     bfsf();
146     ans=bfsj(si,sj);
147     if(ans!=-1) cout<<ans+1<<endl; else cout<<"IMPOSSIBLE"<<endl;
148     /*FOR(i,0,n-1){
149     FOR(j,0,m-1)
150     cout<<visj[i][j];
151     cout<<endl;} */
152 }
153 #ifdef LOCAL
154 fclose(stdin);
155 fclose(stdout);
156 #endif
157 //system(pause);
158 return 0;
159 }
    ys

    可能有多個火點

    *偶然看到的神仙代碼：https://vjudge.net/solution/22247485

    非常自信的寫法，換了我是做不來的
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  • 原文地址：https://www.cnblogs.com/mukoiaoi/p/11605184.html
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