题目大意：这题跟HDOJ"非常可乐"那题很像，用状态空间搜索即可。
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1 #include <stdio.h> 2 #include <string.h> 3 #include <queue> 4 #define N 101 5 #define MIN(a,b) ((a)<(b)?(a):(b)) 6 using namespace std; 7 typedef struct node 8 { 9 int v[2],t; 10 }node; 11 node cur,next; 12 queue<node> Q; 13 int a[2],c; 14 char vis[N][N]; 15 node st_tran(node tmp,int i) 16 { 17 int d; 18 switch(i) 19 { 20 case 0: tmp.v[0]=a[0]; break; 21 case 1: tmp.v[1]=a[1]; break; 22 case 2: tmp.v[0]=0; break; 23 case 3: tmp.v[1]=0; break; 24 case 4: d=MIN(tmp.v[0],a[1]-tmp.v[1]),tmp.v[0]-=d,tmp.v[1]+=d; break; 25 case 5: d=MIN(tmp.v[1],a[0]-tmp.v[0]),tmp.v[1]-=d,tmp.v[0]+=d; break; 26 } 27 tmp.t++; 28 return tmp; 29 } 30 void bfs() 31 { 32 bool success=false; 33 int ans; 34 memset(vis,0,sizeof(vis)); 35 while(!Q.empty()) Q.pop(); 36 cur.v[0]=cur.v[1]=0; 37 cur.t=0; 38 vis[0][0]=1; 39 Q.push(cur); 40 while(!Q.empty() && !success) 41 { 42 cur=Q.front(),Q.pop(); 43 if(cur.v[0]==c || cur.v[1]==c) success=true,ans=cur.t; 44 for(int i=0;!success && i<6;i++) 45 { 46 next=st_tran(cur,i); 47 if(vis[next.v[0]][next.v[1]]) continue; 48 if(next.v[0]==c || next.v[1]==c) success=true,ans=next.t; 49 else vis[next.v[0]][next.v[1]]=1,Q.push(next); 50 } 51 } 52 if(success) printf("%d\n",ans); 53 else puts("-1"); 54 } 55 int main() 56 { 57 while(~scanf("%d%d%d",&a[0],&a[1],&c)) 58 { 59 bfs(); 60 } 61 return 0; 62 }