#include<iostream>
#include<cstring>
#include<cstdio>
using namespace std;
int n,m,ans,lk[1001];
bool f[1001][1001],vis[1001];
inline int read(){
int x=0,f=1;char ch=getchar();
while(ch<'0'||ch>'9'){if(ch=='-')f=-1;ch=getchar();}
while(ch>='0'&&ch<='9'){x=x*10+ch-'0';ch=getchar();}
return x*f;
}
bool find(int x){
for(int i=0;i<=n-1;i++){
if(!vis[i]&&f[x][i]){
vis[i]=1;
if(!lk[i]||find(lk[i])){
lk[i]=x;return 1;
......
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