Submission #373486

#	Time	Username	Problem	Language	Result	Execution time	Memory
373486		eulerdesoja	Traffic (IOI10_traffic)	C++14	Compilation error	0 ms	0 KiB

traffic

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

#define int long long
#define pb push_back
#define sz(x) int(x.size())

typedef pair<int,int>ii;
typedef vector<int> vi;

const int mxn=1e6+6;
//maximum of congestion in a road
vi g[mxn];	
int ma[mxn],sum[mxn];
void dfs(int i,int p,int a[]){
	for(int j:g[i])if(j!=p){
		dfs(j,i,a);
		sum[i]+=sum[j];
		ma[i]=max(ma[i],max(ma[j],sum[j]));
	}
	sum[i]+=a[i];
}
int LocateCentre(int n,int a[],int s[],int d[]){
	
	for(int i=0;i<n-1;i++){
		g[s[i]].pb(d[i]);
		g[d[i]].pb(s[i]);
	}
	int ans=1e18,res;
	for(int i=0;i<n;i++){
		memset(sum,0,sizeof(sum));
		memset(ma,0,sizeof(ma));
		dfs(i,-1,a);
		if(ma[i]<ans){
			ans=ma[i];
			res=i;
		}
	}
	return res;
}

Compilation message (stderr)

traffic.cpp: In function 'long long int LocateCentre(long long int, long long int*, long long int*, long long int*)':
traffic.cpp:40:9: warning: 'res' may be used uninitialized in this function [-Wmaybe-uninitialized]
   40 |  return res;
      |         ^~~
/tmp/ccmiGtr0.o: In function `main':
grader.cpp:(.text.startup+0xd9): undefined reference to `LocateCentre(int, int*, int*, int*)'
collect2: error: ld returned 1 exit status