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WA的同学进,这题太恶心了!!In the next k lines, there is a pair of integers (x, y) in each line, which represents a hole in the y-th row, the x-th column. 注意这句话……汗…… 附16MS代码: #include<iostream> #define SIZE 33 using namespace std; int t[SIZE][SIZE][2]; bool a[SIZE][SIZE][SIZE][SIZE],v[SIZE][SIZE]; int n,m,k,x,y; int go[4][2]={{1,0},{-1,0},{0,1},{0,-1}}; bool canGo(int x,int y) { return (x>=0&&y>=0)&&(x<n&&y<m); } bool find(int x,int y) { for(int i=0;4-i>0;i++) { int xx=x+go[i][0]; int yy=y+go[i][1]; if(canGo(xx,yy)) if(v[xx][yy]==false&&a[x][y][xx][yy]==true) { v[xx][yy]=true; if((t[xx][yy][0]==-1&&t[xx][yy][1]==-1)||find(t[xx][yy][0],t[xx][yy][1])) { t[xx][yy][0]=x; t[xx][yy][1]=y; return true; } } } return false; } int findMatch(void) { int count=0; for(int i=0;n-i>0;i++) { for(int j=0;m-j>0;j++) { if((i+j)%2==0) continue; else { memset(v,false,sizeof(v)); if(find(i,j)) count++; } } } return count; } int main() { while(scanf("%d %d %d",&n,&m,&k)!=EOF) { memset(t,-1,sizeof(t)); memset(a,true,sizeof(a)); for(int i=0;k-i>0;i++) { scanf("%d %d",&y,&x); x--; y--; if((x+y)%2==0) { for(int i=0;4-i>0;i++) { int xx=x+go[i][0]; int yy=y+go[i][1]; if(canGo(xx,yy)) a[xx][yy][x][y]=false; } } else { for(int i=0;4-i>0;i++) { int xx=x+go[i][0]; int yy=y+go[i][1]; if(canGo(xx,yy)) a[x][y][xx][yy]=false; } } } if(k%2==1) { printf("NO\n"); continue; } if((2*findMatch()+k)==(m*n)) printf("YES\n"); else printf("NO\n"); } return 0; } Followed by:
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