Luogu P1550 [USACO08OCT]打井Watering Hole

0号结点：农夫John山泉天然矿泉水（

by Luogu第一篇题解

#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;int n,cnt,tot,ans,fa[100005];struct edge{int u,v,w;
}e[100005];inline void add(int u,int v,int w){e[++cnt].v=v;e[cnt].u=u;e[cnt].w=w;
}inline int getfa(int v){if(fa[v]==v)return v;fa[v]=getfa(fa[v]);return fa[v];
}inline bool cmp(edge x,edge y){return x.w<y.w;
}int main(){scanf("%d",&n);for(int i=1;i<=n;i++){fa[i]=i;int x;scanf("%d",&x);add(0,i,x);}for(int i=1;i<=n;i++){for(int j=1;j<=n;j++){int x;scanf("%d",&x);add(i,j,x);}}sort(e+1,e+cnt+1,cmp);for(int i=1;i<=cnt;i++){int fx=getfa(e[i].u),fy=getfa(e[i].v);if(fx!=fy){fa[fx]=fy;tot++;ans+=e[i].w;}if(tot==n){printf("%d\n",ans);return 0;}}
}

转载于:https://www.cnblogs.com/Y15BeTa/p/11324972.html

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