Submission #238368

#	Time	Username	Problem	Language	Result	Execution time	Memory
238368		oscarsierra12	Friend (IOI14_friend)	C++14	27 / 100	10 ms	6016 KiB

friend

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

#define pb    push_back

using namespace std ;

// Find out best sample

const int N = 100010 ;

int confi[N] ;
int dp [N][2];
vector <int> G[N][2] ;

int go ( int u, int flag ) {
    auto &rf = dp[u][flag];
    if ( rf!=-1 ) return rf ;
    if ( flag ) {
        ///take
        int x = confi[u] ;
        for ( auto v:G[u][0] ) x += go( v, 0 ) ;
        for ( auto v:G[u][1] ) x += go( v, 1 ) ;
        rf = x ;
        ///dont take
        x = 0 ;
        for ( auto v:G[u][0] ) x += go(v,1 ) ;
        for ( auto v:G[u][1] ) x += go(v, 1) ;
        rf = max ( rf, x ) ;
    }
    else {
        int x = 0 ;
        for ( auto v:G[u][1] ) x += go ( v, 0 ) ;
        for ( auto v:G[u][0] ) x += go ( v, 1 ) ;
        rf = x ;
    }
    return rf ;
}

int findSample(int n,int confidence[],int host[],int protocol[]){
    for ( int i = 0 ; i < n ; ++i ) confi[i] = confidence[i] ;
    for ( int i = 1 ; i < n ; ++i ) G[host[i]][protocol[i]].push_back ( i ) ;
    memset ( dp,-1,sizeof dp ) ;
    return go(0,1) ;
}

• Subtask 1: 0 / 11
• Subtask 2: 8 / 8
• Subtask 3: 0 / 8
• Subtask 4: 19 / 19
• Subtask 5: 0 / 23
• Subtask 6: 0 / 31