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Submission #199368

# Submission time Handle Problem Language Result Execution time Memory
199368 2020-01-31T18:59:39 Z CaroLinda Skyscraper (JOI16_skyscraper) C++14
5 / 100
 2000 ms 171232 KB 
#include <bits/stdc++.h>

const int MOD = 1e9+7 ;
const int MAXL = 110 ;
const int MAXN = 15 ;

using namespace std ;

int n , l ;
int f[MAXN] ;
long long dp[ (1<<14)+100 ][ MAXL ][ MAXN ] ;

bool isOn(int mask, int i) { return ((1<<i)&mask) != 0 ; } 

long long solve(int mask, int left, int ant)
{
    
    if( dp[mask][left][ant] != -1 ) return dp[mask][left][ant] ;
    if( mask == ( 1<<n )-1 ) return 1 ;
    
    dp[mask][left][ant] = 0 ;
    
    for(int i = 0 ; i < n ; i++ )
        if( !isOn(mask, i) && left >= abs( f[i+1] - f[ant+1] ) )
            dp[mask][left][ant] = ( dp[mask][left][ant] + solve( mask|(1<<i) , left - abs(f[i+1]-f[ant+1]) , i ) ) % MOD ;
    
    return dp[mask][left][ant] ;
    
    
}

int main()
{
    
    scanf("%d%d", &n , &l ) ;
    for(int i = 1 ; i <= n ; i++ ) scanf("%d", &f[i]) ;
    
    if( n <= 8 )
    {
        
        sort( f+1, f+1+n ) ;
        
        int ans = 0 , soma = 0 ;
        
        for(int i = 1 ; i < n ; i++ )
                soma += abs( f[i] - f[i+1] ) ;
        if( soma <= l ) ans ++ ;
        while( next_permutation( f+1, f+1+n ) )
        {
            soma = 0;
            
            for(int i = 1 ; i < n ; i++ )
                soma += abs( f[i] - f[i+1] ) ;
            if( soma <= l ) ans ++ ;
        }
        
        printf("%d\n" , ans ) ;
        return 0 ;
        
    } 
    
    long long ans = 0LL ;
    memset(dp, -1, sizeof dp ) ;
    
    for( int i = 0 ; i < n ; i++  )
        ans = ( ans + solve( (1<<i) , l , i ) ) % MOD ;
    
    printf("%lld\n" , ans ) ;
    
}

Compilation message

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:35:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &n , &l ) ;
     ~~~~~^~~~~~~~~~~~~~~~~~
skyscraper.cpp:36:41: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for(int i = 1 ; i <= n ; i++ ) scanf("%d", &f[i]) ;
                                    ~~~~~^~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 256 KB Output is correct
2 Correct 5 ms 248 KB Output is correct
3 Correct 6 ms 376 KB Output is correct
4 Correct 5 ms 376 KB Output is correct
5 Correct 6 ms 256 KB Output is correct
6 Correct 6 ms 376 KB Output is correct
7 Correct 6 ms 376 KB Output is correct
8 Correct 6 ms 376 KB Output is correct
9 Correct 6 ms 376 KB Output is correct
10 Correct 6 ms 256 KB Output is correct

Subtask #2
0 / 15.0

# Verdict Execution time Memory Grader output
1 Execution timed out 2630 ms 171232 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #3
0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 256 KB Output is correct
2 Correct 5 ms 248 KB Output is correct
3 Correct 6 ms 376 KB Output is correct
4 Correct 5 ms 376 KB Output is correct
5 Correct 6 ms 256 KB Output is correct
6 Correct 6 ms 376 KB Output is correct
7 Correct 6 ms 376 KB Output is correct
8 Correct 6 ms 376 KB Output is correct
9 Correct 6 ms 376 KB Output is correct
10 Correct 6 ms 256 KB Output is correct
11 Execution timed out 2630 ms 171232 KB Time limit exceeded
12 Halted 0 ms 0 KB -