Submission #497884

#	Time	Username	Problem	Language	Result	Execution time	Memory
497884		vinnipuh01	Maxcomp (info1cup18_maxcomp)	C++17	100 / 100	378 ms	64120 KiB

maxcomp

#include <iostream>
#include <bits/stdc++.h>
#include <cmath>
#include <algorithm>
#include <vector>
#include <deque>
#include <set>
#include <stack>
#include <string>
#include <map>
#include <queue>
#define int long long

using namespace std;

const long long oo = 1000000000000000000;

long long sum, ans = 0, mx = 0, mn = 1000000000, num, pos;


/*
    ViHHiPuh

   (( `'-""``""-'` ))
     )-__-_.._-__-(
   / --- (o _ o) --- \
   \ .-* ( .0. ) *-. /
   _'-. ,_ '=' _, .-'_
  / `;#'#'# - #'#'#;` \
 \_)) -----'#'----- ((_/
      # --------- #
  '# ------- ------ #'
  /..-'# ------- #'-.\
  _\...-\'# -- #'/-.../_
  ((____)- '#' -(____))


    cout << fixed << setprecision(6) << x;

    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

    freopen ( "sum.in", "r", stdin )
*/

int a[ 1001 ][ 1001 ];
int dp[ 2001 ][ 2001 ], dp2[ 2001 ][ 2001 ], dp3[ 2001 ][ 2001 ], dp1[ 2001 ][ 2001 ];


main () {
	int n, m;
	cin >> n >> m;
	for ( int i = 1; i <= n; i ++ )
		dp[ i ][ 0 ] = dp1[ i ][ 0 ] = dp2[ i ][ 0 ] = dp3[ i ][ 0 ] = dp[ i ][ m + 1 ] = dp1[ i ][ m + 1 ] = dp2[ i ][ m + 1 ] = dp3[ i ][ m + 1 ] = oo;
	for ( int i = 1; i <= m; i ++ )
		dp[ 0 ][ i ] = dp1[ 0 ][ i ] = dp2[ 0 ][ i ] = dp3[ 0 ][ i ] = dp[ n + 1 ][ i ] = dp1[ n + 1 ][ i ] = dp2[ n + 1 ][ i ] = dp3[ n + 1 ][ i ] = oo;
	
	for ( int i = 1; i <= n; i ++ ) {
		for ( int j = 1; j <= m; j ++ ) {
			cin >> a[  i][ j ];
		}
	}
	for ( int i = 1; i <= n; i ++ ) {
		for ( int j = 1; j <= m; j ++ ) {
			dp[ i ][ j ] = min( dp[ i ][ j - 1 ] + 1, min( dp[ i - 1 ][ j ] + 1, a[ i ][ j ] + 1 ) );
		}
	}
	for ( int i = 1; i <= n; i ++ ) {
		for ( int j = m; j >= 1; j -- ) {
			dp1[ i ][ j ] = min( dp1[ i - 1 ][ j ] + 1, min( dp1[ i ][ j + 1 ] + 1, a[ i ][ j ] + 1 ) );
		}
	}
	
	for ( int i = n; i >= 1; i -- ) {
		for ( int j = 1; j <= m; j ++ ) {
			dp2[ i ][ j ] = min( dp2[ i ][ j - 1 ] + 1, min( dp2[ i + 1 ][ j ] + 1, a[ i ][ j ] + 1 ) );
		}
	}
	for ( int i = n; i >= 1; i -- ) {
		for ( int j = m; j >= 1; j -- ) {
			dp3[ i ][ j ] = min( dp3[ i + 1 ][ j ] + 1, min( dp3[ i ][ j + 1 ] + 1, a[ i ][ j ] + 1 ) );
		}
	}
	ans = -oo;
	for ( int i = 1; i <= n; i ++ ) {
		for ( int j = 1; j <= m; j ++ ) {
			ans = max( ans, a[ i ][ j ] - min( dp[ i ][ j ], min( dp1[ i ][ j ], min( dp2[ i ][ j ], dp3[ i ][ j ] ) ) ) + 0ll );
//			cout << i << " " << j << " - " << ans << "\n";
		}
	}
	cout << ans;
}

Compilation message (stderr)

maxcomp.cpp:50:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   50 | main () {
      | ^~~~

• Subtask 1: 15 / 15
• Subtask 2: 15 / 15
• Subtask 3: 30 / 30
• Subtask 4: 40 / 40