Submission

Score: 100

User: Fifaxmb

Problemset: เดินทางข้ามชุมชน

Language: cpp

Time: 0.153 second

Submitted On: 2026-04-12 14:01:16

#include<bits/stdc++.h>
using namespace std;
using ti3 = tuple<int,int,int>;
using ti4 = tuple<int,int,int,int>;
#define Fifa67king ios::sync_with_stdio(0);cin.tie(0);
using i64 = long long;
const int mxn = 2e5 + 5;
vector<int> head(mxn);
int find(int x){
    if(head[x] == x) return x;
    head[x] = find(head[x]);
    return head[x];
}
bool chk(int u,int v){
    u = find(u);
    v = find(v);
    if(u == v) return 0;
    return 1;
}
int main(){
    Fifa67king;
    // priority_queue<ti3> pq;
    int n,m,q;cin >> n >> m >> q;;
    vector<ti3> p(m);
    vector<vector<ti3>> adj(n + 1);
    for(int i =0;i < m;i++){
        int u,v,w;cin >> u >> v >> w;
        p[i] = {w,u,v};
    }
    vector<ti4> e(q);
    for(int i = 0; i < q; i++){
        int a,b,k;
        cin >> a >> b >> k;
        e[i] = {k,a,b,i};
    }
    int j = 0;
    vector<string> ans(q);
    sort(e.begin(),e.end());
    sort(p.begin(),p.end());
    for(int i = 1;i <= n;i++) head[i] = i;
    for(auto[k,a,b,i] : e){
        while(j < m){
            auto[w,u,v] = p[j];
            if(w > k) break;
            if(chk(u,v)){
                head[find(u)] = find(v);
            }
            j ++;
        }
        if(find(a) == find(b)) ans[i] = "Yes";
        else ans[i] = "No";
    }
    for(auto &s : ans) cout << s <<'\n';
    // i64 sum = 0;
    // while(!pq.empty()){
    //     auto[w,u,v] = pq.top();pq.pop();
    //     if(chk(u,v)){
    //         head[find_head(u)] = find_head(v);
    //         sum += w - 1;
    //     }
    // }
    // cout << sum;
}