Submission #934112

#	Time	Username	Problem	Language	Result	Execution time	Memory
934112		EJIC_B_KEDAX	Stations (IOI20_stations)	C++17	100 / 100	548 ms	1416 KiB

stations

#include <bits/stdc++.h>

using ll = long long;

using namespace std;

vector<vector<int>> g;
vector<int> res;

void dfs(int s, int p = -1, int d = 0) {
    if (~d & 1) {
        res.push_back(s);
    }
    for (int i : g[s]) {
        if (i != p) {
            dfs(i, s, d + 1);
        }
    }
    if (d & 1) {
        res.push_back(s);
    }
}

vector<int> label(int n, int k, vector<int> u, vector<int> v) {
    g.resize(n);
    for (int i = 0; i < n; i++) {
        g[i].clear();
    }
    res.clear();
    for (int i = 0; i < n - 1; i++) {
        g[u[i]].push_back(v[i]);
        g[v[i]].push_back(u[i]);
    }
    dfs(0);
    vector<int> lb(n);
    for (int i = 0; i < n; i++) {
        lb[res[i]] = i;
    }
    return lb;
}

int find_next_station(int s, int t, vector<int> c) {
    if (c[0] > s) {
        if (t < s) {
            return c.back();
        }
        for (int i = 0; i < c.size(); i++) {
            if (c[i] >= t) {
                return c[i];
            }
        }
        return c.back();
    } else {
        if (t > s) {
            return c[0];
        }
        for (int i = c.size() - 1; i >= 0; i--) {
            if (c[i] <= t) {
                return c[i];
            }
        }
        return c[0];
    }
}

Compilation message (stderr)

stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:47:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |         for (int i = 0; i < c.size(); i++) {
      |                         ~~^~~~~~~~~~

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