66 lines
1.7 KiB
C++
66 lines
1.7 KiB
C++
#include<stdio.h>
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#include<string.h>
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#include<stdlib.h>
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#define N 311
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int num[N][N];
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int len[N][N];
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int main()
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{
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int n,m;
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int i,l,k,t;
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int s,e,dis;
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int a,b,c,d;
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while(scanf("%d%d",&n,&m),n||m)
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{
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memset(num,0,sizeof(num));
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for(i=1;i<=n;i++)
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{
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for(l=1;l<=n;l++)
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{
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if(i==l) len[i][l]=0;
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else len[i][l]=22222222;
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}
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}
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for(i=0;i<m;i++)
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{
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scanf("%d%d%d",&s,&e,&dis);
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if(len[s][e]<dis) continue;
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len[s][e]=len[e][s]=dis;
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num[s][e]=num[e][s]=1;
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}
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for(k=1;k<=n;k++)
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{
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for(i=1;i<=n;i++)
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{
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for(l=1;l<=n;l++)
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{
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t=len[i][k]+len[k][l];
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if(t>len[i][l]) continue;
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if(t<len[i][l])
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{
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len[i][l]=t;
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num[i][l]=num[i][k]+num[k][l];
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}
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else if(num[i][k]+num[k][l]>num[i][l])
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num[i][l]=num[i][k]+num[k][l];
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}
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}
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}
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scanf("%d%d%d%d",&a,&b,&c,&d);
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int ans=-1;
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for(i=1;i<=n;i++)
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{
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for(l=1;l<=n;l++)
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{
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if(num[i][l]>ans
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&& (len[a][b]==len[a][i]+len[i][l]+len[l][b])
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&& (len[c][d]==len[c][i]+len[i][l]+len[l][d])
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)
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ans=num[i][l];
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}
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}
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printf("%d\n",ans+1);
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}
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return 0;
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}
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