mirror of
https://github.com/Kiritow/OJ-Problems-Source.git
synced 2024-03-22 13:11:29 +08:00
106 lines
2.1 KiB
C++
106 lines
2.1 KiB
C++
#include"stdio.h"
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#include"string.h"
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#pragma comment(linker, "/STACK:1024000000,1024000000")
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#define inf 99999999
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int min(int a,int b)
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{
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return a<b?a:b;
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}
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int e,head[100005];
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int level[100005];
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int q[100005];
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struct node
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{
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int to,val;
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int next;
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}edge[200005];
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void add_edge(int x,int y,int w)
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{
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edge[e].to=y;
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edge[e].val=w;
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edge[e].next=head[x];
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head[x]=e++;
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edge[e].to=x;
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edge[e].val=w;
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edge[e].next=head[y];
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head[y]=e++;
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}
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bool bfs(int s,int t)
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{
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int front=0,rear=0;
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int top,k;
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q[rear++]=s;
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memset(level,0,sizeof(level));
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level[s]=1;
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while(front<rear)
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{
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top=q[front++];
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if(top==t)
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return true;
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for(k=head[top];k!=-1;k=edge[k].next)
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{
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if(!level[edge[k].to]&&edge[k].val>0)
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{
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level[edge[k].to]=level[top]+1;
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q[rear++]=edge[k].to;
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}
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}
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}
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return false;
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}
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int dfs(int now,int maxf,int t)
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{
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int ret=0,f,k;
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if(now==t)
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return maxf;
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for(k=head[now];k!=-1;k=edge[k].next)
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{
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if(level[edge[k].to]==level[now]+1&&edge[k].val>0)
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{
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f=dfs(edge[k].to,min(maxf-ret,edge[k].val),t);
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edge[k].val-=f;
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edge[k^1].val+=f;
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ret+=f;
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if(ret==maxf)
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return ret;
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}
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}
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if(ret==0)
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level[now]=0;
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return ret;
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}
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int dinic(int s,int t)
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{
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int ans=0;
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while(bfs(s,t))
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ans+=dfs(s,inf,t);
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return ans;
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}
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int main( )
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{
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int T,i,n,m,s,t;
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int x,y,w,ps,pt;
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scanf("%d",&T);
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while(T--)
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{
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e=0;s=inf;t=0;
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memset(head,-1,sizeof(head));
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scanf("%d%d",&n,&m);
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for(i=1;i<=n;i++)
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{
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scanf("%d%d",&x,&y);
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if(s>x)
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{s=x;ps=i;}
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if(t<x)
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{t=x;pt=i;}
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}
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for(i=1;i<=m;i++)
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{
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scanf("%d%d%d",&x,&y,&w);
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add_edge(x,y,w);
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}
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printf("%d\n",dinic(ps,pt));
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}
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return 0;
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}
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