Submission #495085

#	Time	Username	Problem	Language	Result	Execution time	Memory
495085		vinnipuh01	Chessboard (IZhO18_chessboard)	C++17	16 / 100	93 ms	292 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;


/*
    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;

main () {
	int n, m;
	cin >> m >> n;
	prime_number = 1;
	int x, y, xx, yy;
	for ( int i = 2; i < m; i ++ ) {
		if ( m % i == 0 ) {
			prime_number = 0;
			break;
		}
	}
	num = m * m;
	ans = oo;
	for ( int i = 1; i < m; i ++ ) {
		if ( m % i == 0 ) {
			sum = i * i;
			mn = num / sum;
			mn = mn / 2;
			if ( ans > mn * sum ) {
				ans = mn * sum;
				pos = sum;
			}
		}
	}
	if ( !n || prime_number ) {
		if ( !n )
			cout << ans;
		else {
			num = ( num + 1 ) / 2;
			sum = mx = 0;
			for ( int i = 1; i <= n; i ++ ) {
				cin >> x >> y >> xx >> yy;
				if ( ( x + y ) % 2 ) {
					sum ++;
					ans --;
				}
				else {
					mx ++;
					num --;
				}
			}
			cout << min( ans + mx, num + sum );
		}
	}
	else {
		mn = ( num ) / pos;
		mn = ( mn + 1 ) / 2;
		num = mn * pos;
		pos = sqrt( pos );
		sum = mx = 0;
		for ( int i = 1; i <= n; i ++ ) {
			cin >> x >> y >> xx >> yy;
			x --;
			y --;
			xx --;
			yy --;
			x /= pos;
			y /= pos;
			if ( ( x + y ) % 2 == 1 ) {
				sum ++;
				ans --;
			}
			else {
				mx ++;
				num --;
			}
		}
		cout << min( ans + mx, num + sum );
	}
}

Compilation message (stderr)

chessboard.cpp:48:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   48 | main () {
      | ^~~~

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