求助，拟萌就假装我是个妹子吧

int dfs(int u,int flow){
	if(u==t)
	  return flow;
	int res=0;
	for(int &i=cur[u];i!=-1;i=nxt[i]){
		int v=to[i];
		if(depth[v]==depth[u]+1&&w[i]&&in[v]){
			int di=dfs(v,min(flow,w[i]));
			if(di){
				w[i]-=di;
				w[i^1]+=di;
				res+=di;
				if(res==flow)
				  break;
			}
		}
	}
	return res;
}

int dfs(int u,int flow){
	if(u==t)
	  return flow;
	for(int &i=cur[u];i!=-1;i=nxt[i]){
		int v=to[i];
		if(depth[v]==depth[u]+1&&w[i]&&in[v]){
			int di=dfs(v,min(flow,w[i]));
			if(di){
				w[i]-=di;
				w[i^1]+=di;
				return di;
			}
		}
	}
	return 0;
}