Codeforces Beta Round #35 (Div. 2)
http://codeforces.com/contest/35
A
这场的输入输出是到文件中的，不是标准的输入输出。。。没注意看，RE了好久。。。
1 #include<bits/stdc++.h> 2 using namespace std; 3 #define lson l,mid,rt<<1 4 #define rson mid+1,r,rt<<1|1 5 #define sqr(x) ((x)*(x)) 6 #define pb push_back 7 #define eps 1e-8 8 #define PI acos(-1.0) 9 #define maxn 1000005 10 typedef long long ll; 11 typedef unsigned long long ull; 12 13 /*#ifndef ONLINE_JUDGE 14 freopen("1.txt","r",stdin); 15 #endif */ 16 17 ifstream cinn("input.txt"); 18 ofstream coutt("output.txt"); 19 20 int main(){ 21 #ifndef ONLINE_JUDGE 22 // freopen("1.txt","r",stdin); 23 #endif 24 std::ios::sync_with_stdio(false); 25 int u,v; 26 int b; 27 28 int a[15]; 29 memset(a,0,sizeof(a)); 30 cinn>>b; 31 a[b]=1; 32 for(int i=0;i<3;i++){ 33 cinn>>u>>v; 34 swap(a[u],a[v]); 35 } 36 for(int i=1;i<=3;i++){ 37 if(a[i]==1){ 38 coutt<<i; 39 return 0; 40 } 41 } 42 return 0; 43 }
B
模拟
1 #include<bits/stdc++.h> 2 using namespace std; 3 #define lson l,mid,rt<<1 4 #define rson mid+1,r,rt<<1|1 5 #define sqr(x) ((x)*(x)) 6 #define pb push_back 7 #define eps 1e-8 8 #define PI acos(-1.0) 9 #define maxn 1000005 10 typedef long long ll; 11 typedef unsigned long long ull; 12 13 /*#ifndef ONLINE_JUDGE 14 freopen("1.txt","r",stdin); 15 #endif */ 16 string s,t,x[31][31]; 17 int n,m,k,i,j,a,b,o,r; 18 19 int main(){ 20 // #ifndef ONLINE_JUDGE 21 freopen ("input.txt","r",stdin); 22 freopen ("output.txt","w",stdout); 23 // #endif 24 cin>>n>>m>>k; 25 for (o=1;o<=k;o++){ 26 cin>>s; 27 if (s[0]=='+'){ 28 cin>>a>>b>>t; 29 while (1){ 30 if (x[a][b]==""){ 31 x[a][b]=t; 32 break; 33 } 34 else { 35 b++; 36 if (b>m){ 37 a++; 38 b=1; 39 if (a>n) 40 break; 41 } 42 } 43 } 44 } 45 else { 46 cin>>t; 47 r=0; 48 for (i=1;i<=n;i++){ 49 if (r==1) 50 break; 51 for (j=1;j<=m;j++){ 52 if (x[i][j]==t){ 53 r=1; 54 break; 55 } 56 57 } 58 } 59 if (r==0){ 60 cout<<-1<<" "<<-1<<endl; 61 } 62 else { 63 cout<<i-1<<" "<<j<<endl; 64 x[i-1][j]=""; 65 } 66 } 67 } 68 }
C
bfs
1 #include<bits/stdc++.h> 2 using namespace std; 3 #define lson l,mid,rt<<1 4 #define rson mid+1,r,rt<<1|1 5 #define sqr(x) ((x)*(x)) 6 #define pb push_back 7 #define eps 1e-8 8 #define PI acos(-1.0) 9 #define maxn 1000005 10 typedef long long ll; 11 typedef unsigned long long ull; 12 13 /*#ifndef ONLINE_JUDGE 14 freopen("1.txt","r",stdin); 15 #endif */ 16 int book[2005][2005]; 17 int n,m,k; 18 struct sair{ 19 int x,y,step; 20 }; 21 int dir[4][2]={0,1,1,0,0,-1,-1,0}; 22 23 int main(){ 24 // #ifndef ONLINE_JUDGE 25 freopen ("input.txt","r",stdin); 26 freopen ("output.txt","w",stdout); 27 // #endif 28 cin>>n>>m>>k; 29 int x,y; 30 queue<sair>Q; 31 sair s,e; 32 for(int i=1;i<=k;i++){ 33 cin>>x>>y; 34 s.x=x,s.y=y,s.step=1; 35 book[x][y]=1; 36 Q.push(s); 37 } 38 int last=1; 39 while(!Q.empty()){ 40 s=Q.front(); 41 Q.pop(); 42 for(int i=0;i<4;i++){ 43 e.x=s.x+dir[i][0]; 44 e.y=s.y+dir[i][1]; 45 if(e.x>=1&&e.x<=n&&e.y>=1&&e.y<=m&&!book[e.x][e.y]){ 46 e.step=s.step+1; 47 if(e.step>last) last=e.step; 48 // cout<<last<<endl; 49 book[e.x][e.y]=e.step; 50 Q.push(e); 51 } 52 } 53 } 54 for(int i=1;i<=n;i++){ 55 for(int j=1;j<=m;j++){ 56 if(book[i][j]==last){ 57 cout<<i<<" "<<j<<endl; 58 return 0; 59 } 60 } 61 } 62 }
D
贪心
1 #include<bits/stdc++.h> 2 using namespace std; 3 #define lson l,mid,rt<<1 4 #define rson mid+1,r,rt<<1|1 5 #define sqr(x) ((x)*(x)) 6 #define pb push_back 7 #define eps 1e-8 8 #define PI acos(-1.0) 9 #define maxn 1000005 10 typedef long long ll; 11 typedef unsigned long long ull; 12 13 /*#ifndef ONLINE_JUDGE 14 freopen("1.txt","r",stdin); 15 #endif */ 16 17 int n,x; 18 int a[105]; 19 20 int main(){ 21 // #ifndef ONLINE_JUDGE 22 freopen ("input.txt","r",stdin); 23 freopen ("output.txt","w",stdout); 24 // #endif 25 cin>>n>>x; 26 for(int i=1;i<=n;i++){ 27 cin>>a[i]; 28 a[i]=a[i]*(n-i+1); 29 } 30 sort(a+1,a+n+1); 31 for(int i=1;i<=n;i++){ 32 x-=a[i]; 33 if(x<0){ 34 cout<<i-1<<endl; 35 return 0; 36 } 37 38 } 39 cout<<n<<endl; 40 }
E
扫瞄线，可以用线段树写，不过我是用类似模拟的方法写的
1 #include<bits/stdc++.h> 2 using namespace std; 3 #define lson l,mid,rt<<1 4 #define rson mid+1,r,rt<<1|1 5 #define sqr(x) ((x)*(x)) 6 #define pb push_back 7 #define eps 1e-8 8 #define PI acos(-1.0) 9 #define maxn 1000005 10 typedef long long ll; 11 typedef unsigned long long ull; 12 13 /*#ifndef ONLINE_JUDGE 14 freopen("1.txt","r",stdin); 15 #endif */ 16 17 int n; 18 multiset<int>ms; 19 vector<pair<int,int> >ve,ans; 20 21 22 int main(){ 23 // #ifndef ONLINE_JUDGE 24 freopen ("input.txt","r",stdin); 25 freopen ("output.txt","w",stdout); 26 // #endif 27 std::ios::sync_with_stdio(false); 28 cin>>n; 29 int l,r,h; 30 for(int i=0;i<n;i++){ 31 cin>>h>>l>>r; 32 ve.push_back(make_pair(l,h)); 33 ve.push_back(make_pair(r,-h)); 34 } 35 sort(ve.begin(),ve.end()); 36 int i=0,j; 37 h=0; 38 ms.insert(h); 39 while(i<ve.size()){ 40 j=i; 41 do{ 42 if(ve[j].second>0){ 43 ms.insert(ve[j].second); 44 } 45 else{ 46 ms.erase(ms.find(-ve[j].second)); 47 } 48 j++; 49 50 }while(j<ve.size()&&ve[i].first==ve[j].first); 51 if(h!=*ms.rbegin()){ 52 ans.push_back(make_pair(ve[i].first,h)); 53 ans.push_back(make_pair(ve[i].first,h=*ms.rbegin())); 54 } 55 i=j; 56 } 57 cout<<ans.size()<<endl; 58 for(int i=0;i<ans.size();i++){ 59 cout<<ans[i].first<<" "<<ans[i].second<<endl; 60 } 61 }