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求解为什么W ,在其他题库上已经A了#include<iostream> #include<cstdio> #include<algorithm> #include<cstring> using namespace std; const int maxn=990; int n,m,shu[maxn][maxn],heng[maxn][maxn],head[maxn<<1]; int match[maxn]; int cntn=0,cntm=0; char s[maxn][maxn]; bool v[maxn]; struct Node { int to,next; }edge[maxn<<1]; int tot=0; void Addedge(int x,int y) { edge[++tot].to=y; edge[tot].next=head[x]; head[x]=tot; } bool dfs(int y) { for(int i=head[y];i!=-1;i=edge[i].next) { int p=edge[i].to; if(!v[p]) { v[p]=1; if( !match[p] || dfs( match[p] ) ) { match[p]=y; return true; } } } return false; } int main() { memset(head,-1,sizeof(head)); memset(match,0,sizeof(match)); scanf("%d%d",&n,&m); for(int i=0;i<n;i++) { scanf("%s",s[i]); } cntn=1; cntm=1; for(int i=0;i<n;i++) { int j; for(j=0;j<m;j++) { if(s[i][j]=='*') { while(s[i][j]=='*') { shu[i][j++]=cntn; } j--; cntn++; } } } for(int j=0;j<m;j++) { int i; for(i=0;i<n;i++) { if(s[i][j]=='*') { while(s[i][j]=='*') { heng[i++][j]=cntm; } i--; cntm++; } } } for(int i=0;i<n;i++) { for(int j=0;j<m;j++) { if(s[i][j]=='*') { Addedge(shu[i][j],heng[i][j]); } } } int ans=0; for(int i=0;i<n*m;i++) { memset(v,0,sizeof(v)); if( dfs(i) )ans++; } printf("%d\n",ans); //system("pause"); } Followed by: Post your reply here: |
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