oj.uz

Submission #869955

# Submission time Handle Problem Language Result Execution time Memory
869955 2023-11-06T12:20:30 Z chonka Giraffes (JOI22_giraffes) C++
59 / 100
 7000 ms 600 KB 
#include<bits/stdc++.h>
using namespace std ;
typedef long long ll ;
typedef unsigned long long ull ;
typedef pair < int , int > pii ;
typedef vector < int > vi ;
#define fi first
#define se second
mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());

#define rep(i, a, b) for(int i = a; i < (b); ++i)
#define all(x) begin(x), end(x)
#define sz(x) (int)(x).size()

#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")

const int MAXN = 8007 ;

int n ;
int a[ MAXN ] ;

int dp[ MAXN ][ 4 ] ;
int nw[ MAXN ][ 4 ] ;

void solve ( ) {
    cin >> n ;
    for ( int i = 1 ; i <= n ; ++ i ) {
        cin >> a[ i ] ;
    }
    for ( int i = 1 ; i <= n ; ++ i ) {
        for ( int j = 0 ; j < 4 ; ++ j ) {
            dp[ i ][ j ] = 0 ;
            nw[ i ][ j ] = MAXN ; 
        }
    }
    for ( int len = 2 ; len <= n + 1 ; ++ len ) {
        bool done = true ;
        for ( int i = 1 ; i <= n ; ++ i ) {
            bool done1 = false , done2 = false ;
            for ( int t = i - 1 ; t >= 1 ; -- t ) {
                int id ;
                if ( i - t > a[ i ] - 1 ) { done2 = true ; }
                if ( i - t > n - a[ i ] ) { done1 = true ; }
                if ( done1 == true && done2 == true ) { break ; }
                if ( a[ t ] < a[ i ] ) {
                    id = 3 ;
                    if ( done2 == true ) { continue ; }
                }
                else {
                    id = 2 ;
                    if ( done1 == true ) { continue ; }
                }
                int dx = i - t , dy = abs ( a[ i ] - a[ t ] ) ;
                if ( dp[ t ][ id ^ 3 ] < min ( dx , dy ) ) {
                    nw[ i ][ id ] = min ( nw[ i ][ id ] , max ( dx , dy ) ) ;
                }
                if ( dp[ t ][ id ^ 2 ] < dx ) {
                    nw[ i ][ id ] = min ( nw[ i ][ id ] , max ( dx , dy + dp[ t ][ id ^ 2 ] ) ) ;
                }
                if ( dp[ t ][ id ^ 1 ] < dy ) {
                    nw[ i ][ id ] = min ( nw[ i ][ id ] , max ( dy , dx + dp[ t ][ id ^ 1 ] ) ) ;
                }
                nw[ i ][ id ] = min ( nw[ i ][ id ] , max ( dx , dy ) + dp[ t ][ id ] ) ;
                if ( dx > nw[ i ][ 2 ] && dx > nw[ i ][ 3 ] ) { break ; }
            }
            done1 = false , done2 = false ;
            for ( int t = i + 1 ; t <= n ; ++ t ) {
                int id ;
                if ( t - i > a[ i ] - 1 ) { done2 = true ; }
                if ( t - i > n - a[ i ] ) { done1 = true ; }
                if ( done1 == true && done2 == true ) { break ; }
                if ( a[ t ] < a[ i ] ) {
                    id = 1 ;
                    if ( done2 == true ) { continue ; }
                }
                else {
                    id = 0 ;
                    if ( done1 == true ) { continue ; }
                }
                int dx = t - i , dy = abs ( a[ i ] - a[ t ] ) ;
                if ( dp[ t ][ id ^ 3 ] < min ( dx , dy ) ) {
                    nw[ i ][ id ] = min ( nw[ i ][ id ] , max ( dx , dy ) ) ;
                }
                if ( dp[ t ][ id ^ 2 ] < dx ) {
                    nw[ i ][ id ] = min ( nw[ i ][ id ] , max ( dx , dy + dp[ t ][ id ^ 2 ] ) ) ;
                }
                if ( dp[ t ][ id ^ 1 ] < dy ) {
                    nw[ i ][ id ] = min ( nw[ i ][ id ] , max ( dy , dx + dp[ t ][ id ^ 1 ] ) ) ;
                }
                nw[ i ][ id ] = min ( nw[ i ][ id ] , max ( dx , dy ) + dp[ t ][ id ] ) ;
                if ( dx > nw[ i ][ 0 ] && dx > nw[ i ][ 1 ] ) { break ; }
            }
            if ( nw[ i ][ 0 ] > n - i || nw[ i ][ 0 ] > n - a[ i ] ) { nw[ i ][ 0 ] = MAXN ; }
            if ( nw[ i ][ 1 ] > n - i || nw[ i ][ 1 ] > a[ i ] - 1 ) { nw[ i ][ 1 ] = MAXN ; }
            if ( nw[ i ][ 2 ] > i - 1 || nw[ i ][ 2 ] > n - a[ i ] ) { nw[ i ][ 2 ] = MAXN ; }
            if ( nw[ i ][ 3 ] > i - 1 || nw[ i ][ 3 ] > a[ i ] - 1 ) { nw[ i ][ 3 ] = MAXN ; }
        }
        for ( int i = 1 ; i <= n ; ++ i ) {
            for ( int j = 0 ; j < 4 ; ++ j ) {
                dp[ i ][ j ] = nw[ i ][ j ] ;
                if ( dp[ i ][ j ] != MAXN ) { done = false ; }
                nw[ i ][ j ] = MAXN ; 
            }
        }
        if ( done == true ) {
            cout << n - ( len - 1 ) << "\n" ;
            return ;
        }
    }
}

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

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 516 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 344 KB Output is correct

Subtask #2
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 516 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 344 KB Output is correct
11 Correct 0 ms 344 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 344 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct

Subtask #3
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 516 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 344 KB Output is correct
11 Correct 0 ms 344 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 344 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 1 ms 344 KB Output is correct
22 Correct 2 ms 344 KB Output is correct
23 Correct 8 ms 348 KB Output is correct
24 Correct 16 ms 484 KB Output is correct
25 Correct 29 ms 468 KB Output is correct
26 Correct 23 ms 348 KB Output is correct
27 Correct 25 ms 488 KB Output is correct
28 Correct 24 ms 348 KB Output is correct
29 Correct 25 ms 344 KB Output is correct
30 Correct 28 ms 348 KB Output is correct

Subtask #4
0 / 41.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 516 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 344 KB Output is correct
11 Correct 0 ms 344 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 344 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 1 ms 344 KB Output is correct
22 Correct 2 ms 344 KB Output is correct
23 Correct 8 ms 348 KB Output is correct
24 Correct 16 ms 484 KB Output is correct
25 Correct 29 ms 468 KB Output is correct
26 Correct 23 ms 348 KB Output is correct
27 Correct 25 ms 488 KB Output is correct
28 Correct 24 ms 348 KB Output is correct
29 Correct 25 ms 344 KB Output is correct
30 Correct 28 ms 348 KB Output is correct
31 Correct 4400 ms 536 KB Output is correct
32 Execution timed out 7096 ms 600 KB Time limit exceeded
33 Halted 0 ms 0 KB -