Submission #208594

#	Time	Username	Problem	Language	Result	Execution time	Memory
208594		DodgeBallMan	Traffic (IOI10_traffic)	C++14	0 / 100	17 ms	23804 KiB

traffic

#include<bits/stdc++.h>
#include "traffic.h"

using namespace std;
 
const int N = 1e6 + 10;
bool vis[N];
long long val[N], sum;
vector<int> g[N];
 
long long dfs( int u, int p ) {
    for( int v : g[u] ) if( v != p ) val[u] += dfs( v, u );
    return val[u];
}
 
int LocateCentre(int N, int pp[], int S[], int D[])
{
    for ( int i = 0 ; i < N ; i++ ) val[i] = pp[i], sum += val[i];
    for ( int i = 0 ; i < N - 1 ; i++ ) g[S[i]].emplace_back( D[i] ), g[D[i]].emplace_back( S[i] );
    dfs( 0, -1 );
    int ret;
    long long mn = 1e18;
    for ( int i = 0 ; i < N ; i++ ) {
        long long mx = sum - val[i];
        for( int v : g[i] ) mx = max( mx, val[v] );
        if( mn > mx ) mn = mx, ret = i;
    }
    return ret;
}

Compilation message (stderr)

traffic.cpp: In function 'int LocateCentre(int, int*, int*, int*)':
traffic.cpp:28:12: warning: 'ret' may be used uninitialized in this function [-Wmaybe-uninitialized]
     return ret;
            ^~~

• Subtask 1: 0 / 25
• Subtask 2: 0 / 25
• Subtask 3: 0 / 25
• Subtask 4: 0 / 25