mirror of
https://github.com/Kiritow/OJ-Problems-Source.git
synced 2024-03-22 13:11:29 +08:00
97 lines
2.2 KiB
C++
97 lines
2.2 KiB
C++
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#include<stdio.h>
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#include<string.h>
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#define INF 0x3f3f3f
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#define max 150+10
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int visit[max],map[max][max],dist[max];
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char str[max][max];
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int n;
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void dijkstra()
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{
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}
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int main()
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{
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int i,j,next,mindist;
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int t,x,y,c;
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char s[30],e[30];
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while(scanf("%d",&n)&&(n!=-1))
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{
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for(i=1;i<150;i++)
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{
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for(j=1;j<150;j++)
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{
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if(i==j)
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map[i][j]=0;
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else
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map[i][j]=INF;
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}
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}
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scanf("%s %s",s,e);
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strcpy(str[1],s);
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strcpy(str[2],e);
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t=2;
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for(j=1;j<=n;j++)
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{
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scanf("%s %s %d",s,e,&c);
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for(i=1,x=max,y=max;i<=t;i++)
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{
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if(strcmp(str[i],s)==0&&x==max)
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x=i;
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if(strcmp(str[i],e)==0&&y==max)
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y=i;
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if(x!=max&&y!=max)
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break;
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}
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if(x==max)
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{
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t++;
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x=t;
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strcpy(str[x],s);
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}
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if(y==max)
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{
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t++;
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y=t;
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strcpy(str[y],e);
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}
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if(map[x][y]>c)
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map[x][y]=map[y][x]=c;
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}
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if(strcmp(str[1],str[2])==0)
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{
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printf("0\n");
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continue;
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}
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for(i=1;i<150;i++)
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{
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visit[i]=0;
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dist[i]=map[1][i];
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}
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visit[1]=1;
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for(i=2;i<=t;i++)
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{
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mindist=INF;
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for(j=1;j<=t;j++)
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{
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if(!visit[j]&&mindist>dist[j])
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{
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mindist=dist[j];
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next=j;
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}
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}
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visit[next]=1;
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for(j=1;j<=t;j++)
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{
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if(!visit[j]&&dist[next]+map[next][j]<dist[j])
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{
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dist[j]=dist[next]+map[next][j];
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}
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}
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}
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if(dist[2]==INF)
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printf("-1\n");
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else
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printf("%d\n",dist[2]);
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}
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return 0;
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}
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