Submission #495216

#	Time	Username	Problem	Language	Result	Execution time	Memory
495216		vinnipuh01	Chessboard (IZhO18_chessboard)	C++17	70 / 100	2061 ms	3448 KiB

chessboard

#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, answer;


/*
    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 )
*/

bool prime_number;
int n, m, x[ 100001 ], y[ 100001 ], xx[ 100001 ], yy[ 100001 ];


int f( int o ) {
	num = m * m;
	sum = o * o;
	mn = num / sum;
	ans = mn / 2;
	num = mn / 2;
	if ( mn % 2 )
		num ++;
	ans = ans * sum;
	num = num * sum;
	sum = mx = 0;
	for ( int i = 1; i <= n; i ++ ) {
		for ( int j = x[ i ] / o; j <= xx[ i ] / o; j ++ ) {
			for ( int k = y[ i ] / o; k <= yy[ i ] / o; k ++ ) {
				if ( ( ( j ) + ( k ) ) % 2 ) {
					sum ++;
					ans --;
				}
				else {
					num --;
					mx ++;
				}	
			}
		}
		
	}
	return min( ans + mx, num + sum );
}

main () {
	cin >> m >> n;
	prime_number = 1;
	for ( int i = 2; i < m; i ++ ) {
		if ( m % i == 0 ) {
			prime_number = 0;
			break;
		}
	}
	for ( int i = 1; i <= n; i ++ ) {
		cin >> x[ i ] >> y[ i ] >> xx[ i ] >> yy[ i ];
		x[ i ] --;
		y[ i ] --;
		xx[ i ] --;
		yy[ i ] --;
	}
	answer = f( 1 );
	int sq = sqrt( m );
	for ( int i = 2; i <= sq; i ++ ) {
		if ( m % i == 0 ) {
			answer = min( answer, min( f( i ), f( m / i ) ) );
		}
	}
	cout << answer;
}

Compilation message (stderr)

chessboard.cpp:79:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   79 | main () {
      | ^~~~

• Subtask 1: 8 / 8
• Subtask 2: 8 / 8
• Subtask 3: 15 / 15
• Subtask 4: 16 / 16
• Subtask 5: 23 / 23
• Subtask 6: 0 / 30