Problem - G - Codeforces

题意：

 

 Code：

#include <bits/stdc++.h>

#define int long long

using namespace std;

const int N=2e5+10;
const int mod=1e9+7;

int a[N];
struct node {
    int x, y, val;
    bool operator < (const node &k) const {
        return val < k.val;
    }
}b[N];
struct Que {
    int x, y, val;
    int pos;
    bool operator < (const Que &k) const {
        return val < k.val;
    }
}que[N];
bool ok[N];
int fa[N];
int getf(int x) {
    if (x == fa[x]) return x;
    return fa[x] = getf(fa[x]);
}
void solve(){
    int n, m;
    cin >> n >> m;
    for (int i = 1; i <= n; i++) {
        cin >> a[i];
    }
    for (int i = 1; i <= m; i++) {
        int x, y, val;
        cin >> x >> y;
        val = max(a[x], a[y]);
        b[i] = {x, y, val};
    }
    sort(b + 1, b + 1 + m);
    for (int i = 1; i <= n; i++) {
        fa[i] = i;
    }
    int q;
    cin >> q;
    for (int i = 1; i <= q; i++) {
        int x, y, val;
        cin >> x >> y >> val;
        que[i] = {x, y, val + a[x], i};
    }
    sort(que + 1, que + 1 + q);
    int r = 1;
    for (int i = 1; i <= q; i++) {
        while(r <= m && b[r].val <= que[i].val) {
            int fx = getf(b[r].x), fy = getf(b[r].y);
            r++;
            if (fx == fy) continue;
            fa[fx] = fy;
        }
        ok[que[i].pos] = (getf(que[i].x) == getf(que[i].y));
    }
    for (int i = 1; i <= q; i++) {
        if (ok[i]) cout << "YES\n";
        else cout << "NO\n";
    }
}
signed main(){
	ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
	int __=1;cin>>__;
	while(__--)solve();return 0;
}