Submission #1269287

#	Time	Username	Problem	Language	Result	Execution time	Memory
1269287		BlockOG	Stations (IOI20_stations)	C++20	0 / 100	3029 ms	2162688 KiB

stations

#include <bits/stdc++.h>

// mrrrow meeow :3
// go play vivid/stasis now! https://vividstasis.gay

#define fo(i, a, b) for (auto i = (a); i < (b); i++)
#define of(i, a, b) for (auto i = (b); i-- > (a);)
#define f first
#define s second
#define pb push_back
#define pob pop_back
#define lb lower_bound
#define ub upper_bound
#define be(a) a.begin(), a.end()
using namespace std;

int ____init = [] {
    ios::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    return 0;
}();

vector<int> adj[1000];
vector<int> labels;

int cnt = 0;

void dfs_end(int i, int p);

void dfs_start(int i, int p = -1) {
    labels[i] = cnt++;
    for (int j : adj[i]) {
        if (j == p) continue;
        dfs_end(j, i);
    }
}

void dfs_end(int i, int p = -1) {
    for (int j : adj[i]) {
        if (j == p) continue;
        dfs_start(j, i);
    }
    labels[i] = cnt++;
}

vector<int> label(int n, int k, vector<int> u, vector<int> v) {
    fo(i, 0, n - 1) adj[u[i]].pb(v[i]), adj[v[i]].pb(u[i]);
    labels.resize(n);
    dfs_start(0);
    return labels;
}

int find_next_station(int s, int t, vector<int> c) {
    if (s < c[0]) {
        if (t < s || t > c.back()) return c.back();
        return *lb(be(c), t);
    } else {
        if (t > s || t < c.front()) return c.front();
        return *--ub(be(c), t);
    }
}

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