Submission #463690

#	Time	Username	Problem	Language	Result	Execution time	Memory
463690		Khizri	Traffic (IOI10_traffic)	C++17	100 / 100	1152 ms	182468 KiB

traffic

#include "traffic.h"
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pb push_back		 
#define F first																 
#define S second 															 
#define INF 1e18
#define all(v) (v).begin(),(v).end()
#define rall(v) (v).rbegin(),(v).rend()
#define pii pair<int,int>
#define pll pair<ll,ll>
#define OK cout<<"Ok"<<endl;
#define MOD (ll)(1e9+7)
#define endl "\n"
const int mxn=1e6+5;
int a[mxn],b[mxn],node,dis[mxn],len[mxn],SUM;
vector<int>vt[mxn];
ll dfs(int u,int p,int sum,int arr[]){
	int ans=0;
	for(int v:vt[u]){
		if(v!=p){
			int k=dfs(v,u,sum+arr[u],arr);
			dis[u]=max(dis[u],k);
			ans+=k;
		}
	}
	dis[u]=max(dis[u],SUM-ans-arr[u]);
	return ans+arr[u];
}
int LocateCentre(int n, int arr[], int S[], int D[]) {
	for(int i=0;i<n;i++){
		SUM+=arr[i];
	}
	for(int i=0;i<n-1;i++){
		vt[S[i]].pb(D[i]);
		vt[D[i]].pb(S[i]);
	}
	dfs(0,-1,0,arr);
	ll maxs=INF,ind;
	for(int i=0;i<n;i++){
		if(dis[i]<maxs){
			maxs=dis[i];
			ind=i;
		}
	}
	return ind;
}

Compilation message (stderr)

traffic.cpp: In function 'int LocateCentre(int, int*, int*, int*)':
traffic.cpp:47:9: warning: 'ind' may be used uninitialized in this function [-Wmaybe-uninitialized]
   47 |  return ind;
      |         ^~~

• Subtask 1: 25 / 25
• Subtask 2: 25 / 25
• Subtask 3: 25 / 25
• Subtask 4: 25 / 25