mirror of
https://github.com/Kiritow/OJ-Problems-Source.git
synced 2024-03-22 13:11:29 +08:00
120 lines
2.3 KiB
C++
120 lines
2.3 KiB
C++
#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <iostream>
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using namespace std;
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const int N=300;
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int head[N];
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const int MAXE=5000000;
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const int inf=1<<30;
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int n,m,k;
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int cnt,s,t;
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int H[]={1,3,5,7,9};
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int d[N],pre[N];
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int ans=0;
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bool vis[N];
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int q[MAXE];
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struct Edge
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{
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int u,v,c,w,next;
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}edge[MAXE];
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void addedge(int u,int v,int w,int c)
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{
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edge[cnt].u=u;
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edge[cnt].v=v;
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edge[cnt].w=w;
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edge[cnt].c=c;
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edge[cnt].next=head[u];
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head[u]=cnt++;
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edge[cnt].v=u;
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edge[cnt].u=v;
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edge[cnt].w=-w;
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edge[cnt].c=0;
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edge[cnt].next=head[v];
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head[v]=cnt++;
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}
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int SPFA()
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{
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int l,r;
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memset(pre,-1,sizeof(pre));
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memset(vis,0,sizeof(vis));
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for(int i=0;i<=t;i++) d[i]=inf;
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d[s]=0;
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l=0;r=0;
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q[r++]=s;
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vis[s]=1;
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while(l<r)
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{
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int u=q[l++];
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vis[u]=0;
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for(int j=head[u];j!=-1;j=edge[j].next)
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{
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int v=edge[j].v;
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if(edge[j].c>0&&d[u]+edge[j].w<d[v])
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{
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d[v]=d[u]+edge[j].w;
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pre[v]=j;
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if(!vis[v])
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{
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vis[v]=1;
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q[r++]=v;
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}
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}
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}
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}
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if(d[t]==inf)
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return 0;
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return 1;
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}
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void MCMF()
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{
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int flow=0;
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while(SPFA())
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{
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int u=t;
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int mini=inf;
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while(u!=s)
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{
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if(edge[pre[u]].c<mini)
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mini=edge[pre[u]].c;
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u=edge[pre[u]].u;
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}
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flow+=mini;
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ans+=d[t]*mini;
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u=t;
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while(u!=s)
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{
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edge[pre[u]].c-=mini;
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edge[pre[u]^1].c+=mini;
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u=edge[pre[u]].u;
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}
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}
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if (flow<k)
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printf("-1\n");
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else
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printf("%d\n",ans);
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}
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int main()
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{
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while (scanf("%d%d%d",&n,&m,&k)!=EOF)
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{
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int u,v,c,w;
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cnt=0;
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s=0;
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t=n;
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ans=0;
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memset(head,-1,sizeof(head));
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addedge(s,1,0,k);
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for (int i=1;i<=m;i++)
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{
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scanf("%d%d%d%d",&u,&v,&w,&c);
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for (int j=0;j<c;j++)
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{
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addedge(u,v,H[j]*w,1);
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}
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}
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addedge(n,t,0,inf);
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MCMF();
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}
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}
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