Submission #384997

#	Time	Username	Problem	Language	Result	Execution time	Memory
384997		ritul_kr_singh	Traffic (IOI10_traffic)	C++17	Compilation error	0 ms	0 KiB

traffic

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

const int MAXN = 1e6;
vector<vector<int>> g;
int sub[MAXN], sum = 0, curr = 0, ans = 1e18;

void dfs0(int u, int par){
	for(int v : g[u]) if(v != par){
			sub[u] += dfs0(v, u);
			curr = max(curr, sub[v]);
	}
	return sub[u];
}

void dfs1(int u, int par){
	ans = min(ans, curr);
	for(int v : g[u]){
		if(v==par) continue;
		int prev = curr;
		curr = max(curr, sum - sub[v]);
		dfs1(v, u);
		curr = prev;
	}
}

int LocateCentre(int n, int pop[], int S[], int D[]){
	for(int i=0; i<n; ++i) sum += (sub[i] = pop[i]);
	g.resize(n);
	for(int i=0; i<n-1; ++i){
		g[S[i]].push_back(D[i]);
		g[D[i]].push_back(S[i]);
	}
	dfs0(0, 0);
	dfs1(0, 0);
	return ans;
}

Compilation message (stderr)

traffic.cpp:7:41: warning: overflow in conversion from 'double' to 'int' changes value from '1.0e+18' to '2147483647' [-Woverflow]
    7 | int sub[MAXN], sum = 0, curr = 0, ans = 1e18;
      |                                         ^~~~
traffic.cpp: In function 'void dfs0(int, int)':
traffic.cpp:11:18: error: void value not ignored as it ought to be
   11 |    sub[u] += dfs0(v, u);
      |              ~~~~^~~~~~
traffic.cpp:14:14: error: return-statement with a value, in function returning 'void' [-fpermissive]
   14 |  return sub[u];
      |              ^