Submission #489712

#	Time	Username	Problem	Language	Result	Execution time	Memory
489712		mdn2002	Bali Sculptures (APIO15_sculpture)	C++14	71 / 100	141 ms	16108 KiB

sculpture

#include<bits/stdc++.h>
using namespace std;
int n , a , b , y [2003] , dp [2003][2003] , dpp [2003] , pre [2003];
long long mask;
bool f ( int x , int num )
{
    if ( x == n + 1 )
    {
        if ( a <= num && num <= b ) return 1;
        return 0;
    }
    if ( dp [x][num] != -1 ) return dp [x][num];
    bool ans = 0;
    long long sum = 0;
    for ( int i = x ; i <= n ; i ++ )
    {
        sum += y [i];
        if ( ( mask | sum ) > mask ) continue;
        ans = max ( ans , f ( i + 1 , num + 1 ) );
    }
    return dp [x][num] = ans;
}
long long ff ( )
{
    for ( int i = 1 ; i <= n ; i ++ ) dpp [i] = 1e10;
    for ( int i = 1 ; i <= n ; i ++ )
    {
        for ( int j = 1 ; j <= i ; j ++ )
        {
            long long sum = pre [i] - pre [ j - 1 ];
            if ( ( mask | sum ) > mask ) continue;
            dpp [i] = min ( dpp [i] , dpp [ j - 1 ] + 1 );
        }
    }
    return dpp [n];
}
bool ck ( )
{
    memset ( dp , -1 , sizeof dp );
    if ( n <= 100 ) return f ( 1 , 0 );
    else
    {
        int mn = ff ( );
        return ( mn <= b );
    }
}
int main()
{
    //freopen ( "fence8.in" , "r" , stdin );
    //freopen ( "fence8.out" , "w" , stdout );
    scanf ( "%d%d%d" , &n , &a , &b );
    for ( int i = 1 ; i <= n ; i ++ )
    {
        scanf ( "%d" , &y [i] );
        pre [i] = y [i] + pre [ i - 1 ];
    }
    mask = ( 1ll << 50 ) - 1;
    for ( int i = 49 ; i >= 0 ; i -- )
    {
        mask ^= ( 1ll << i );
        if ( ck ( ) == 0 ) mask ^= ( 1ll << i );
    }
    printf ( "%lld" , mask );
}

Compilation message (stderr)

sculpture.cpp: In function 'bool f(int, int)':
sculpture.cpp:21:24: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   21 |     return dp [x][num] = ans;
      |            ~~~~~~~~~~~~^~~~~
sculpture.cpp: In function 'long long int ff()':
sculpture.cpp:25:49: warning: overflow in conversion from 'double' to 'int' changes value from '1.0e+10' to '2147483647' [-Woverflow]
   25 |     for ( int i = 1 ; i <= n ; i ++ ) dpp [i] = 1e10;
      |                                                 ^~~~
sculpture.cpp: In function 'int main()':
sculpture.cpp:51:11: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   51 |     scanf ( "%d%d%d" , &n , &a , &b );
      |     ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
sculpture.cpp:54:15: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   54 |         scanf ( "%d" , &y [i] );
      |         ~~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 16 / 16
• Subtask 3: 21 / 21
• Subtask 4: 25 / 25
• Subtask 5: 0 / 29