Submission #1119025

#	Time	Username	Problem	Language	Result	Execution time	Memory
1119025		PagodePaiva	Bridges (APIO19_bridges)	C++17	14 / 100	92 ms	10300 KiB

bridges

#include<bits/stdc++.h>

using namespace std;

const int N = 200010;
vector <array <int, 3>> mst;
vector <array <int, 3>> arestas;

int ordem_arestas[N];
struct DSU{
    int pai[N], sz[N];
    DSU(){
        for(int i = 1;i < N;i++){
            pai[i] = i;
            sz[i] = 1;
        }
    }
    int find(int x){
        return pai[x] = (pai[x] == x ? x : find(pai[x]));
    }
    void join(int a, int b, int w){
        a = find(a);
        b = find(b);
        if(a == b) return;
        mst.push_back({w, a, b});
        if(sz[a] > sz[b]) swap(a, b);
        pai[a] = b;
        sz[b] += sz[a];
        return;   
    }
} dsu;

vector <array<int, 3>> queries;
int res[N];

int main(){
    ios::sync_with_stdio(false); cin.tie(0);
    int n, m, q;
    cin >> n >> m;
    for(int i = 0;i < m;i++){
        int a, b, w;
        cin >> a >> b >> w;
        arestas.push_back({w, a, b});
    }
    sort(arestas.begin(), arestas.end());
    cin >> q;
    for(int i = 0;i < q;i++){
        int t, a, b;
        cin >> t >> a >> b;
        queries.push_back({b, a, i});
    }
    sort(queries.begin(), queries.end());
    while(queries.size() > 0){
        auto [ww, s, i] = queries.back();
        while(arestas.size() > 0){
            auto [w, a, b] = arestas.back();
            if(w < ww) break;
            dsu.join(a, b, w);
            arestas.pop_back();
        }
        res[i] = dsu.sz[dsu.find(s)];
        queries.pop_back();
    }
    for(int i = 0;i < q;i++){
        cout << res[i] << '\n';
    }
}

• Subtask 1: 0 / 13
• Subtask 2: 0 / 16
• Subtask 3: 0 / 17
• Subtask 4: 14 / 14
• Subtask 5: 0 / 13
• Subtask 6: 0 / 27