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吃屎吧,数组要开到2000,血试出来的,唉#include<cstdio> #include<cstring> const int N=2000+5; using namespace std; int cnt[N][N],tag[N][N],g[N][N],link[N]; int n,m,x,y,k,ans,cntx; bool vis[N]; void init(){ ans=0;cntx=0; memset(link,0,sizeof(link)); memset(cnt,0,sizeof(cnt)); memset(tag,0,sizeof(tag)); memset(g,0,sizeof(g)); } bool find(int x){ int v; for(int j=1;j<=cntx;j++){ if((!vis[j]) && g[x][j]){ vis[j]=true; if((!link[j]) || (find(link[j]))){ link[j]=x; return true; } } } return false; } int main(){ freopen("test.in","r",stdin); while(scanf("%d%d%d",&m,&n,&k)==3){ init(); for(int i=1;i<=k;i++){ scanf("%d%d",&y,&x); tag[x][y]=1; } for(int i=1;i<=m;i++) for(int j=1;j<=n;j++) if(!tag[i][j]) cnt[i][j]=++cntx; for(int i=1;i<=m;i++) for(int j=1;j<=n;j++) if(!tag[i][j]){ if(j>1 && !tag[i][j-1]) g[cnt[i][j]][cnt[i][j-1]]=1; if(j<n && !tag[i][j+1]) g[cnt[i][j]][cnt[i][j+1]]=1; if(i>1 && !tag[i-1][j]) g[cnt[i][j]][cnt[i-1][j]]=1; if(i<m && !tag[i+1][j]) g[cnt[i][j]][cnt[i+1][j]]=1; } for(int i=1;i<=cntx;i++){ memset(vis,false,sizeof(vis)); if(find(i)) ans++; } if(ans==cntx) printf("YES\n"); else printf("NO\n"); } return 0; } Followed by:
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