Submission #751646

#	Time	Username	Problem	Language	Result	Execution time	Memory
751646		JooDdae	버스 (JOI14_bus)	C++17	100 / 100	286 ms	22884 KiB

bus

#include <bits/stdc++.h>
using namespace std;
using ll = long long;

const int INF = 1e9;

int n, m, q, in[300300];
priority_queue<array<int, 3>, vector<array<int, 3>>, greater<>> pq;
vector<array<int, 2>> v[100100];

int main(){
    cin.tie(0)->sync_with_stdio(0);
    cin >> n >> m;
    for(int i=1;i<=m;i++) {
        int a, b, c, d; cin >> a >> b >> c >> d;
        pq.push({c, i, a}), pq.push({d, -i, b});
    }

    memset(in, -1, sizeof in);

    while(!pq.empty()) {
        auto [t, id, u] = pq.top(); pq.pop();

        if(id < 0) {
            id = -id;
            if(in[id] < 0 || (!v[u].empty() && v[u].back()[1] >= in[id])) continue;
            v[u].push_back({t, in[id]});
        } else {
            if(u == 1) in[id] = t;
            else if(!v[u].empty()) in[id] = v[u].back()[1];
        }
    }

    cin >> q;
    while(q--) {
        int x; cin >> x;

        auto it = lower_bound(v[n].begin(), v[n].end(), array<int, 2>({x, INF}));
        cout << (it == v[n].begin() ? -1 : (*prev(it))[1]) << "\n";
    }
}

• Subtask 1: 20 / 20
• Subtask 2: 15 / 15
• Subtask 3: 15 / 15
• Subtask 4: 50 / 50