Submission #306148

#	Time	Username	Problem	Language	Result	Execution time	Memory
306148		SorahISA	Stations (IOI20_stations)	C++17	52.32 / 100	1006 ms	1304 KiB

stations

#include "stations.h"
#include <bits/stdc++.h>
using namespace std;

using pii = pair<int, int>;
template<typename T>
using Prior = priority_queue<T>;
template<typename T>
using prior = priority_queue<T, vector<T>, greater<T>>;

#define X first
#define Y second
#define ALL(x) (x).begin(), (x).end()
#define eb emplace_back
#define pb push_back

const int maxn = 1000 + 5;

vector<int> adj[maxn], lab, sz;
int tok = 0;

void dfs(int now, int lst) {
    lab[now] = tok++, sz[now] = 1;
    for (auto x : adj[now]) {
        if (x != lst) dfs(x, now), sz[now] += sz[x];
    }
}

vector<int> label(int n, int k, vector<int> u, vector<int> v) {
    for (int i = 0; i < maxn; ++i) adj[i].clear();
    lab.resize(n), sz.resize(n);
    tok = 0;
    
    for (int i = 0; i < n-1; ++i) {
        adj[u[i]].eb(v[i]), adj[v[i]].eb(u[i]);
    }
    dfs(0, -1);
    
    for (int i = 1; i < n; ++i) lab[i] += sz[i] * 1000;
    
    // cout << "lab : ";
    // for (int i = 0; i < n; ++i) cout << lab[i] << " \n"[i == n-1];
    
    return lab;
}

int find_next_station(int s, int t, vector<int> c) {
    sort(ALL(c), [](auto a, auto b) {return a%1000 < b%1000;});
    // cout << "c : "; for (auto x : c) cout << x << " "; cout << "\n";
    if (s != 0 and (s%1000 > t%1000 or s%1000 + s/1000 <= t%1000)) return c[0];
    for (int i = 1; i < c.size(); ++i) {
        if (c[i]%1000 > t%1000) return c[i - 1];
    }
    return c.back();
}

Compilation message (stderr)

stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:51:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   51 |     for (int i = 1; i < c.size(); ++i) {
      |                     ~~^~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 8
• Subtask 3: 16 / 16
• Subtask 4: 10 / 10
• Subtask 5: 26.3244 / 61