128 lines
2.7 KiB
C++
128 lines
2.7 KiB
C++
#include<stdio.h>
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#include<string.h>
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#define clr(x)memset(x,0,sizeof(x))
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#define INF 0x1f1f1f1f
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#define min(a,b)(a)<(b)?(a):(b)
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#define max(a,b)(a)>(b)?(a):(b)
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struct node
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{
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int next,from,to,w,c;
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}e[1000010];
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int tot;
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int head[210];
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void add(int st,int u,int wi,int flow)
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{
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e[tot].from=st;
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e[tot].to=u;
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e[tot].w=wi;
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e[tot].c=flow;
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e[tot].next=head[st];
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head[st]=tot++;
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e[tot].from=u;
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e[tot].to=st;
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e[tot].w=-wi;
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e[tot].c=0;
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e[tot].next=head[u];
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head[u]=tot++;
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}
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int q[100010];
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int pre[2010];
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int dis[2010];
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int v[220];
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int s,t;
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int spfa()
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{
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int i,x,front,rear,k;
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front=rear=0;
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for(i=0;i<=t;i++)
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dis[i]=INF;
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clr(v);
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pre[s]=-1;
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q[rear++]=s;
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dis[s]=0;
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v[s]=1;
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while(front<rear)
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{
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x=q[front++];
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v[x]=0;
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for(i=head[x];i!=-1;i=e[i].next)
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{
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k=e[i].to;
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if(e[i].c&&dis[x]+e[i].w<dis[k])
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{
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dis[k]=dis[x]+e[i].w;
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pre[k]=i;
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if(!v[k])
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{
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v[k]=1;
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if(dis[k]<=dis[x]&&front>0)
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q[--front]=k;
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else q[rear++]=k;
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}
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}
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}
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}
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if(dis[t]!=INF)
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return 1;
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return 0;
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}
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int costflow()
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{
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int tt=0;
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int tot=0,flow=0,u,minf=INF;
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while(spfa())
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{
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for(u=pre[t];u!=-1;u=pre[e[u].from])
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minf=min(minf,e[u].c);
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for(u=pre[t];u!=-1;u=pre[e[u].from])
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{
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e[u].c-=minf;
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e[u^1].c+=minf;
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flow+=e[u].w*minf;
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}
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}
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return flow;
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}
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int g[105][105];
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int main()
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{
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int m,n,a,b,c,k,K,w,z,i,j;
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while(scanf("%d%d%d",&n,&m,&K)!=EOF)
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{
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if(n==0&&m==0&&K==0)
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break;
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memset(g,INF,sizeof(g));
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for(i=0;i<=n;i++)
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g[i][i]=0;
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while(m--)
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{
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scanf("%d%d%d",&a,&b,&w);
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if(w<g[a][b])
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g[a][b]=g[b][a]=w;
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}
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for(k=0;k<=n;k++)
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for(i=0;i<=n;i++)
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for(j=0;j<=n;j++)
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if(g[i][k]+g[k][j]<g[i][j])
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g[i][j]=g[i][k]+g[k][j];
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int res;
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s=2*n+1;
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t=2*n+2;
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tot=0;
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memset(head,-1,sizeof(head));
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add(s,0,0,K);
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add(0,t,0,w);
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for(i=1;i<=n;i++)
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{
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add(0,i,g[0][i],1);
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add(i,i+n,-1000000,1);
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add(i+n,t,g[0][i],1);
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}
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for(i=1;i<=n;i++)
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for(j=i+1;j<=n;j++)
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add(i+n,j,g[i][j],1);
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printf("%d\n",costflow()+1000000*n);
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}
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return 0;
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}
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