Submission #907416

#	Time	Username	Problem	Language	Result	Execution time	Memory
907416		Pikachu	Stations (IOI20_stations)	C++17	76 / 100	572 ms	1532 KiB

stations

#include <bits/stdc++.h>
#include "stations.h"
 
using namespace std;
 
vector<int> label(int n, int k, vector<int> u, vector<int> v) 
{
	vector<int> labels(n);
    vector<vector<int> > adj(n);
    
    for (int i = 0; i < n - 1; i++) {
        adj[u[i]].push_back(v[i]);
        adj[v[i]].push_back(u[i]);
    }
	
    vector<int> ti(n), to(n);
    int T = 0;
    auto DFS = [&] (auto DFS, int u, int par, int h) -> void
    {
        ti[u] = ++T;
        for (int i = 0; i < (int)adj[u].size(); i++) {
            if (adj[u][i] == par) {
                adj[u].erase(adj[u].begin() + i); 
                break;
            }
        }
        if (adj[u].size()) {
            for (int i = 0; i < (int)adj[u].size() - 1; i++) {
                DFS(DFS, adj[u][i], u, h + 1);
            }
            DFS(DFS, adj[u].back(), u, h + 1);
        }
        to[u] = ++T;
        if (h & 1) labels[u] = ti[u];
        else labels[u] = to[u];
    };
    DFS(DFS, 0, -1, 0);
 
	return labels;
}
 
int find_next_station(int s, int t, vector<int> c) 
{
    if (s > c.back()) {
        for (int i = 1; i < (int)c.size() - 1; i++) {
            if (c[i] <= t && t < c[i + 1]) return c[i];
        }
        if (c.back() <= t && t < s) return c.back();
        return c.front();
    }
    else {
        for (int i = 1; i < (int)c.size() - 1; i++) {
            if (c[i - 1] < t && t <= c[i]) return c[i];
        }
        if (s <= t && t <= c.front()) return c.front();
        return c.back();
    }
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 8
• Subtask 3: 16 / 16
• Subtask 4: 10 / 10
• Subtask 5: 50 / 61