Make It Connected

https://codeforces.com/contest/1095/problem/F

题解：并查集+最小生成树

TLE，WA，RE搞死中，就因为数组开小了，23333

/*
*@Author:   STZG
*@Language: C++
*/
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int N=410000;
const int MOD=1e9+7;
const double PI = acos(-1.0);
const double EXP = 1E-8;
const int INF = 0x3f3f3f3f;
int t,n,m,k,q,v,u;
ll  a[N],w;
int pre[N];
struct node{int u,v;ll w;node(){};node(int _u,int _v,ll _w){u=_u;v=_v;w=_w;}bool operator <(const node&S)const{return w<S.w;}
}e[N];
int find(int x){int rt=x;while(pre[rt]!=rt){rt=pre[rt];}pre[x]=rt;//并查集路径压缩return rt;
}
int main()
{
#ifdef DEBUGfreopen("input.in", "r", stdin);//freopen("output.out", "w", stdout);
#endifscanf("%d%d",&n,&m);int id=1;for(int i=1;i<=n;i++){pre[i]=i;scanf("%I64d",&a[i]);if(a[i]<=a[id])id=i;}int tot=0;for(int i=1;i<=n;i++){//if(i!=id)e[++tot]=node(i,id,a[i]+a[id]);}for(int i=1;i<=m;i++){scanf("%d%d%I64d",&u,&v,&w);e[++tot]=node(u,v,w);}sort(e+1,e+tot+1);ll ans=0;for(int i=1;i<=tot;i++){int x=find(e[i].u);int y=find(e[i].v);if(x!=y){pre[x]=pre[y];ans+=e[i].w;}}cout << ans << endl;//cout << "Hello world!" << endl;return 0;
}

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