Submission #434057

#	Time	Username	Problem	Language	Result	Execution time	Memory
434057		kwongweng	Stations (IOI20_stations)	C++17	Compilation error	0 ms	0 KiB

stations

#include "stations.h"
#include <bits/stdc++.h>
using namespace std;
typedef vector<int> vi;
#define pb push_back

vector<vi> g;
vi ans, sz, d, used;
int cur = 0;

void dfs1(int u = 0, int p = -1){
	for (int v : g[u]){
		if (v == p) continue;
		d[v] = d[u] + 1;
		dfs1(v, u);
		sz[u] += sz[v] + 1;
	}
}

void dfs2(int u = 0, int p = -1){
	if (d[u] % 2 == 0){
		used[cur] = 1;
		ans[u] = cur;
		while (used[cur]) cur++;
	}else{
		used[cur+sz[u]] = 1;
		ans[u] = cur+sz[u];
		while (used[cur]) cur++;
	}
	for (int v : g[u]){
		if (v == p) continue;
		dfs2(v, u);
	}
}

vi label(int n, int k, vi u, vi v) {
	g.resize(n);
	ans.resize(n); used.resize(n);
	d.resize(n); sz.resize(n);
	for (int i = 0; i < n-1; i++){
		g[u[i]].pb(v[i]);
		g[v[i]].pb(u[i]);
	}
	dfs1();
	dfs2();
	return ans;
}

Compilation message (stderr)

/usr/bin/ld: /tmp/ccmK7r9m.o: in function `main':
stub.cpp:(.text.startup+0x4cc): undefined reference to `find_next_station(int, int, std::vector<int, std::allocator<int> >)'
collect2: error: ld returned 1 exit status