70 lines
1.6 KiB
C++
70 lines
1.6 KiB
C++
#include<iostream>
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#include<cstdio>
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#include<cstdlib>
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#include<cstring>
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#include<algorithm>
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using namespace std;
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const int MAXN=400;
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const int INF=0x7fffffff;
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int N,M,S;
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int a[MAXN][MAXN],dis[MAXN];
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bool visit[MAXN],d[MAXN];
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int StoerWagner(int N)
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{
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int p=N,ans=INF,Max,t,s,k,i;
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memset(d,0,sizeof(d));
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while (--p>0)
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{
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memset(visit,0,sizeof(visit));
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memset(dis,0,sizeof(dis));
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i=1;
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while (d[i]) i++;
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visit[i]=1;
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for (int j=1;j<=N;j++)
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if (!d[j] && !visit[j])
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dis[j]=a[i][j];
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t=s=i;
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for (;i<=N;i++)
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{
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Max=0;
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for (int j=1;j<=N;j++)
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if (!d[j] && !visit[j] && Max<dis[j])
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Max=dis[k=j];
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if (!Max) break;
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visit[k]=1;
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for (int j=1;j<=N;j++)
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if (!d[j] && !visit[j])
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dis[j]+=a[k][j];
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s=t;
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t=k;
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}
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if (ans>dis[t]) ans=dis[t];
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d[t]=1;
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for (int j=1;j<=N;j++)
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if (!d[j])
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{
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a[s][j]+=a[t][j];
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a[j][s]+=a[j][t];
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}
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}
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return ans;
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}
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int main()
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{
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while (1)
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{
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scanf("%d%d%d",&N,&M,&S);
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if (!N && !M && !S) break;
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memset(a,0,sizeof(a));
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for (int i=1;i<=M;i++)
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{
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int x,y,d;
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scanf("%d%d%d",&x,&y,&d);
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a[x][y]+=d;
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a[y][x]+=d;
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}
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printf("%d\n",StoerWagner(N));
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}
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return 0;
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}
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