Submission #502086

#	Time	Username	Problem	Language	Result	Execution time	Memory
502086		mbfibat	Race (IOI11_race)	C++17	Compilation error	0 ms	0 KiB

race

#include <bits/stdc++.h>

using namespace std;

typedef pair<int, int> ii;

vector<ii> adj[200001];

int h[200001], d[200001];
map<int, int> mp[200001];

int dfs(int u, int p, int k) {
	int ans = 1e9;
	mp[u][d[u]] = h[u];
	for (auto& [v, w] : adj[u]) {
		if (v == p) continue;
		h[v] = h[u] + 1;
		d[v] = d[u] + w;
		ans = min(ans, dfs(v, u, k));

		if (mp[v].size() > mp[u].size()) swap(mp[v], mp[u]);
		for (auto& [dis, height] : mp[v])
			if (mp[u].count(k - (dis - d[u]) + d[u]))
				ans = min(ans, mp[u][k - (dis - d[u]) + d[u]] + height - 2 * h[u]);
		for (auto& [dis, height] : mp[v]) {
			if (!mp[u].count(dis)) mp[u][dis] = height;
			else mp[u][dis] = min(mp[u][dis], height);
		}			
		mp[v].clear();
	}
	return ans;
}

int best_path(int n, int k, int **h, int *l) {
	for (int i = 0; i < n - 1; i++) {
		int u = h[i][0], v = h[i][1], w = l[i];
		adj[u].push_back(ii(v, w));
		adj[v].push_back(ii(u, w));
	}
	int ans = dfs(0, -1, k);
	if (ans == 1e9) ans = -1;
	return ans;
}

Compilation message (stderr)

/usr/bin/ld: /tmp/ccCIErtQ.o: in function `main':
grader.cpp:(.text.startup+0x28): undefined reference to `best_path(int, int, int (*) [2], int*)'
collect2: error: ld returned 1 exit status