Submission #32216

#	Time	Username	Problem	Language	Result	Execution time	Memory
32216		chonka	K blocks (IZhO14_blocks)	C++98	0 / 100	139 ms	87572 KiB

blocks

#include<iostream>
#include<stdio.h>
#include<stack>
using namespace std ;

#define inf 1000000007
#define MAXN 100007
#define MAXK 107

int n , k ;
int a[ MAXN ] ;

long long dp[ MAXN ][ MAXK ] ;

long long vals[ MAXN ] ;
long long pref[ MAXN ] ;

void input ( ) {
    scanf ( "%d%d" , &n , &k ) ;
    int i ;
    for ( i = 1 ; i <= n ; i ++ ) {
        scanf ( "%d" , &a[ i ] ) ;
    }
}

void solve ( ) {
    stack < int > s ;
    int sz ;
    int i , j ;
    for ( i = 1 ; i <= n ; i ++ ) {
        dp[ i ][ 1 ] = max ( dp[ i - 1 ][ 1 ] , 1LL * a[ i ] ) ;
    }
    pref[ 0 ] = inf ;
    for ( j = 2 ; j <= k ; j ++ ) {
        while ( s.empty ( ) == false ) { s.pop ( ) ; }
        a[ j - 1 ] = inf ;
        s.push ( j - 1 ) ;
        sz = 1 ;
        for ( i = j ; i <= n ; i ++ ) {
            while ( s.empty ( ) == false && a[ s.top ( ) ] <= a[ i ] ) {
                sz -- ;
                s.pop ( ) ;
            }
            vals[ sz ] = dp[ s.top ( ) ][ j - 1 ] + a[ i ] ;
            pref[ sz ] = min ( pref[ sz - 1 ] , vals[ sz ] ) ;
            dp[ i ][ j ] = pref[ sz ] ;
            s.push ( i ) ;
            sz ++ ;
        }
    }
    printf ( "%lld\n" , dp[ n ][ k ] ) ;
}


int main ( ) {
    input ( ) ;
    solve ( ) ;
    return 0 ;
}

Compilation message (stderr)

blocks.cpp: In function 'void input()':
blocks.cpp:19:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf ( "%d%d" , &n , &k ) ;
                                ^
blocks.cpp:22:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf ( "%d" , &a[ i ] ) ;
                                  ^

• Subtask 1: 0 / 14
• Subtask 2: 0 / 18
• Subtask 3: 0 / 21
• Subtask 4: 0 / 47