Submission #468364

#	Time	Username	Problem	Language	Result	Execution time	Memory
468364		kessido	Stations (IOI20_stations)	C++17	Compilation error	0 ms	0 KiB

stations

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

#define ll long long int
#define vll vector<ll>
#define vi vector<int>
#define vvi vector<vi>
#define pi pair<int, int>
#define pll pair<ll, ll>
#define all(x) (x).begin(), (x).end()
#define fori(i,n) for(int i = 0; i < int(n); ++i)

vi label(int n, int k, const vi& u, const vi& v) {
    vvi e(n);
    fori(i,n-1){
        e[u[i]].push_back(v[i]);
        e[v[i]].push_back(u[i]);
    }
    int cur_label = 0;
    vi res(n, -1);
    auto dfs = [&](auto& self, int i, int parent) -> void {
        res[i] = cur_label++;
        for(int j : e[i]) {
            if(j==parent) continue;
            self(self, j, i);
        }
    };
    dfs(dfs, 0, -1);
    return res;
}

int find_next_station(int s, int t, vi c) {
    sort(all(c));
    if(t < s) return c[0]; // parent;
    int i = 1;
    while(i < c.size() && c[i] >= t) i++;
    return c[i-1];    
}

Compilation message (stderr)

stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:37:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |     while(i < c.size() && c[i] >= t) i++;
      |           ~~^~~~~~~~~~
/usr/bin/ld: /tmp/ccCyWPwG.o: in function `main':
stub.cpp:(.text.startup+0x2b5): undefined reference to `label(int, int, std::vector<int, std::allocator<int> >, std::vector<int, std::allocator<int> >)'
collect2: error: ld returned 1 exit status