Submission #289677

#	Time	Username	Problem	Language	Result	Execution time	Memory
289677		Farrius	Traffic (IOI10_traffic)	C++11	Compilation error	0 ms	0 KiB

traffic

#include <bits/stdc++.h>

using namespace std;
const int MX = 1e6;
const int INF = 2e9 + 1;

int fans = 0;

vector<int> g[MX], nodes(MX), people(MX), children(MX);

int dfs (int v, int parent) {

	for (auto x: g[v]) {
		if (x == parent) continue;
		int k = dfs(x, v);
		children[v] += children[x];
		people[v] = max(people[v], k);
	}

	people[v] = max(people[v], fans - children[v] - nodes[v]);
	
	children[v] += nodes[v];
}

int LocateCentre (int n, vector<int>& p, vector<int>& s, vector<int>& d) {
	for (int i = 0; i < n; i++) {
		fans += p[i];
		nodes[i] = p[i];
	}
	
	for (int i = 0; i < n - 1; i++) {
		g[s[i]].push_back(d[i]);
		g[d[i]].push_back(s[i]);
	}

	dfs(0, -1);

	int sol = INF, res = -1;
	
	for (int i = 0; i < n; i++) {
		if (people[i] < sol) {
			res = i;
			sol = people[i];
		}
	}

	return res;
}

Compilation message (stderr)

traffic.cpp: In function 'int dfs(int, int)':
traffic.cpp:23:1: warning: no return statement in function returning non-void [-Wreturn-type]
   23 | }
      | ^
/tmp/ccGntPj9.o: In function `main':
grader.cpp:(.text.startup+0xad): undefined reference to `LocateCentre(int, int*, int*, int*)'
collect2: error: ld returned 1 exit status