Submission #634312

#	Time	Username	Problem	Language	Result	Execution time	Memory
634312		tabr	Stations (IOI20_stations)	C++17	0 / 100	5 ms	888 KiB

stations

#include <bits/stdc++.h>
using namespace std;
#ifdef tabr
#include "library/debug.cpp"
#else
#define debug(...)
#endif

// editorial?

vector<int> label(int n, int k, vector<int> x, vector<int> y) {
    vector<vector<int>> g(n);
    for (int i = 0; i < n - 1; i++) {
        g[x[i]].emplace_back(y[i]);
        g[y[i]].emplace_back(x[i]);
    }
    vector<int> in(n), out(n), order;
    function<void(int, int)> Dfs = [&](int v, int p) {
        in[v] = (int) order.size();
        order.emplace_back(v);
        for (int to : g[v]) {
            if (to == p) {
                continue;
            }
            Dfs(to, v);
        }
        out[v] = (int) order.size();
    };
    Dfs(0, -1);
    vector<int> res(n);
    for (int i = 0; i < n; i++) {
        res[i] = out[i] * 1000 + in[i];
    }
    return res;
}

int find_next_station(int s, int t, vector<int> c) {
    int t_in = t % 1000;
    sort(c.begin(), c.end(), [&](int i, int j) {
        return i % 1000 > j % 1000;
    });
    for (int v : c) {
        int v_in = v % 1000;
        int v_out = v / 1000;
        if (v_in < t_in && t_in < v_out) {
            return v;
        }
    }
    assert(false);
    return -1;
}

#ifdef tabr
int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    return 0;
}
#endif

• Subtask 1: 0 / 5
• Subtask 2: 0 / 8
• Subtask 3: 0 / 16
• Subtask 4: 0 / 10
• Subtask 5: 0 / 61