http://acm.hdu.edu.cn/showproblem.php?pid=1102
题目大意:又是求最短路径的问题啦,只不过有些路已经建好了,现在要你计算连通所有点,还要花修路费,建好的就不用考虑了。
解题思路:已经做到麻木的类型题了,不说了。
int Graph[MaxSize][MaxSize];
long sum;
bool visited[MaxSize];
int NumOfVillage;
void Prim()
{
int i,j;
sum = 0;
int dist[MaxSize];
int min,locate;
memset(visited,0,sizeof(visited));
for(i=1;i<=NumOfVillage;i++)
dist[i] = Graph[1][i];
visited[1] = true;
for (j=1;j<=NumOfVillage;j++)
{
min = INIT;
for (i=1;i<=NumOfVillage;i++)
{
if(!visited[i]&&dist[i]<min)
{
min = dist[i];
locate = i;
}
}
visited[locate] = true;
for (i=1;i<=NumOfVillage;i++)
{
if (!visited[i]&&dist[i]>Graph[locate][i])
{
dist[i] = Graph[locate][i];
}
}
}
for (i=1;i<=NumOfVillage;i++)
{
sum+=dist[i];
}
}
int main()
{
int i,j,Q;
while (scanf("%d",&NumOfVillage)!=EOF)
{
for (i=1;i<=NumOfVillage;i++)
{
for(j=1;j<=NumOfVillage;j++)
scanf("%d",&Graph[i][j]);
}
scanf("%d",&Q);
while (Q--)
{
scanf("%d%d",&i,&j);
Graph[i][j] = 0;
Graph[j][i] = 0;
}
Prim();
printf("%ld/n",sum);
}
return 0;
}