Submission #1296382

#	Time	Username	Problem	Language	Result	Execution time	Memory
1296382		kawhiet	Stations (IOI20_stations)	C++20	Compilation error	0 ms	0 KiB

stations

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

vector<int> a;
vector<vector<int>> g;

void dfs(int u, int p) {
	a.push_back(u);
	for (auto v : g[u]) {
		if (v != p) {
			dfs(v, u);
		}
	}
}

vector<int> label(int n, int k, vector<int> u, vector<int> v) {
	g.assign(n, {});
	for (int i = 0; i < n - 1; i++) {
		g[u[i]].push_back(v[i]);
		g[v[i]].push_back(u[i]);
	}
	int r = -1, mx = 0;
	for (int i = 0; i < n; i++) {
		if (g[i].size() > mx) {
			mx = g[i].size();
			r = i;
		}
	}
	vector<int> ret(n);
	ret[r] = 0;
	int cur = 1;
	for (auto u : g[r]) {
		int x = cur;
		int p = r;
		while (true) {
			ret[u] = x;
			x += g[r].size();
			bool has = 0;
			for (auto v : g[u]) {
				if (v != p) {
					has = 1;
					p = u;
					u = v;
					break;
				}
			}
			if (!has) break;
		}
		cur++;
	}
	return ret;
}

Compilation message (stderr)

/usr/bin/ld: /tmp/ccQ4XU41.o: in function `main':
stub.cpp:(.text.startup+0x4ce): undefined reference to `find_next_station(int, int, std::vector<int, std::allocator<int> >)'
collect2: error: ld returned 1 exit status