mirror of
https://github.com/Kiritow/OJ-Problems-Source.git
synced 2024-03-22 13:11:29 +08:00
84 lines
2.2 KiB
C++
84 lines
2.2 KiB
C++
#include<iostream>
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#include<cstdio>
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#include<algorithm>
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#include<cstring>
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using namespace std;
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typedef long long ll;
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#define MAXN 2222
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#define MAXM 2222222
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struct Edge{
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int v,next;
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ll cap;
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}edge[MAXM];
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int head[MAXN];
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int pre[MAXN];
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int cur[MAXN];
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int level[MAXN];
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int gap[MAXN];
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int NV,NE,n,m,vs,vt;
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void Insert(int u,int v,ll cap,ll cc=0){
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edge[NE].v=v;edge[NE].cap=cap;
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edge[NE].next=head[u];head[u]=NE++;
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edge[NE].v=u;edge[NE].cap=cc;
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edge[NE].next=head[v];head[v]=NE++;
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}
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ll SAP(int vs,int vt){
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memset(pre,-1,sizeof(pre));
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memset(level,0,sizeof(level));
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memset(gap,0,sizeof(gap));
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for(int i=0;i<=NV;i++)cur[i]=head[i];
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int u=pre[vs]=vs;
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ll aug=-1,maxflow=0;
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gap[0]=NV;
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while(level[vs]<NV){
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loop:
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for(int &i=cur[u];i!=-1;i=edge[i].next){
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int v=edge[i].v;
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if(edge[i].cap&&level[u]==level[v]+1){
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aug==-1?aug=edge[i].cap:aug=min(aug,edge[i].cap);
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pre[v]=u;
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u=v;
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if(v==vt){
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maxflow+=aug;
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for(u=pre[u];v!=vs;v=u,u=pre[u]){
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edge[cur[u]].cap-=aug;
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edge[cur[u]^1].cap+=aug;
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}
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aug=-1;
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}
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goto loop;
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}
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}
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int minlevel=NV;
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for(int i=head[u];i!=-1;i=edge[i].next){
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int v=edge[i].v;
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if(edge[i].cap&&minlevel>level[v]){
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cur[u]=i;
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minlevel=level[v];
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}
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}
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if(--gap[level[u]]==0)break;
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level[u]=minlevel+1;
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gap[level[u]]++;
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u=pre[u];
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}
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return maxflow;
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}
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int main(){
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int _case,u,v,w,flag,t=1;
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scanf("%d",&_case);
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while(_case--){
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scanf("%d%d",&n,&m);
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vs=0,vt=n-1,NV=n,NE=0;
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memset(head,-1,sizeof(head));
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for(int i=1;i<=m;i++){
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scanf("%d%d%d%d",&u,&v,&w,&flag);
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Insert(u,v,(ll)w*MAXM+1);
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if(flag)Insert(v,u,(ll)w*MAXM+1);
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}
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ll ans=SAP(vs,vt);
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printf("Case %d: %d\n",t++,ans%MAXM);
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}
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return 0;
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}
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