oj.uz

Submission #618121

# Submission time Handle Problem Language Result Execution time Memory
618121 2022-08-01T23:34:07 Z chonka Candies (JOI18_candies) C++
0 / 100
 1 ms 468 KB 
#include<bits/stdc++.h>
using namespace std ;
typedef long long ll ;

const int MAXN = 2e5 + 7 ;

int n ;
int a[ MAXN ] ;

int prv[ MAXN ] ;
ll sm[ MAXN ] ;
int st[ MAXN ] , en[ MAXN ] ;

priority_queue < pair < ll , int > > q ;

int get ( int x ) {
    if ( prv[ x ] == -1 ) { return x ; }
    int y = get ( prv[ x ] ) ;
    prv[ x ] = y ;
    return y ;
}

void unite ( int x , int y ) {
    int k1 = get ( x ) ;
    int k2 = get ( y ) ;
    if ( k1 != k2 ) {
        sm[ k1 ] -= sm[ k2 ] ;
        prv[ k2 ] = k1 ;
        st[ k1 ] = min ( st[ k1 ] , st[ k2 ] ) ;
        en[ k1 ] = max ( en[ k1 ] , en[ k2 ] ) ;
    }
}

void solve ( ) {
    cin >> n ;
    for ( int i = 1 ; i <= n ; ++ i ) {
        cin >> a[ i ] ;
        prv[ i ] = -1 , sm[ i ] = a[ i ] ;
        en[ i ] = st[ i ] = i ;

        q.push ( { sm[ i ] , i } ) ;
    }
    ll ans = 0 ;
    for ( int i = 1 ; i <= ( n + 1 ) / 2 ; ++ i ) {
        while ( q.empty ( ) == false ) { 
            auto [ aux , wh ] = q.top ( ) ;
            q.pop ( ) ;
            wh = get ( wh ) ;
            if ( sm[ wh ] != aux ) { continue ; }
            ans += aux ;
            cout << ans << "\n" ;
            if ( st[ wh ] != 1 ) {
                unite ( wh , st[ wh ] - 1 ) ;
            }
            if ( en[ wh ] != n ) {
                unite ( wh , en[ wh ] + 1 ) ;
            }
            sm[ wh ] = -sm[ wh ] ;
            q.push ( { sm[ wh ] , wh } ) ;
            break ;
        }
    }
}

int main ( ) {
    ios_base :: sync_with_stdio ( false ) ;
    cin.tie ( NULL ) ;
    int t = 1 ; // cin >> t ; 
    while ( t -- ) { solve ( ) ; }
    return 0 ;
}

Compilation message

candies.cpp: In function 'void solve()':
candies.cpp:46:18: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   46 |             auto [ aux , wh ] = q.top ( ) ;
      |                  ^

Subtask #1
0 / 8.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 468 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 92.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 468 KB Output isn't correct
2 Halted 0 ms 0 KB -