59 lines
1.3 KiB
C++
59 lines
1.3 KiB
C++
#include<iostream>
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#include<cstdio>
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#include<algorithm>
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#include<cstring>
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#define INF 1000000
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using namespace std;
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int city,road;
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int mapp[205][205];
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int spand[205];
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int select[205];
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void dij(int city)
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{
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int minn,k,i,j;
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memset(select,0,sizeof(select));
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for(i=1;i<=city;i++)
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spand[i]=mapp[1][i];
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spand[1]=0;select[1]=1;
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for(i=2;i<=city;i++)
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{
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minn=INF;k=-1;
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for(j=1;j<=city;j++)
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{
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if(!select[j]&&spand[j]<minn)
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{
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k=j;minn=spand[j];
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}
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}
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if(k==-1)break;
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select[k]=1;
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for(j=1;j<=city;j++)
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{
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if(spand[j]>spand[k]+mapp[k][j]&&!select[j])
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spand[j]=spand[k]+mapp[k][j];
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}
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}
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printf("%d\n",spand[city]);
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}
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int main()
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{
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int i;int x,y,z;
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while(scanf("%d%d",&city,&road)!=EOF)
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{
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if(city==0||road==0)
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break;
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memset(mapp,INF,sizeof(mapp));
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memset(spand,INF,sizeof(spand));
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for(i=1;i<=road;i++)
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{
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scanf("%d%d%d",&x,&y,&z);
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if(mapp[x][y]>z||mapp[y][x]>z)
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{
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mapp[x][y]=z;mapp[y][x]=z;
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}
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}
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dij(city);
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}
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return 0;
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}
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