Submission #495164

#	Time	Username	Problem	Language	Result	Execution time	Memory
495164		kingline	Chessboard (IZhO18_chessboard)	C++17	8 / 100	2 ms	716 KiB

chessboard

#include <bits/stdc++.h>
#define pb push_back
#define ios ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define all(data) data.begin() , data.end()
#define endl '\n'
//freopen("nenokku_easy.in", "r", stdin);
//freopen("nenokku_easy.out", "w", stdout);
#define int long long

using namespace std;

typedef long long ll;
const ll N = 1e3 + 5;

int n, k, pref[N][N];

main() {
    cin >> n >> k;
    for(int kk = 1; kk <= k; kk++) {
        int x, y, xx, yy;
        cin >> x >> y >> xx >> yy;
        for(int i = x; i <= xx; i++) {
            for(int j = y; j <= yy; j++) {
                pref[i][j] = 1;
            }
        }
    }
    for(int i = 1; i <= n; i++) {
        for(int j = 1; j <= n; j++) {
            pref[i][j] += pref[i - 1][j] + pref[i][j - 1] - pref[i - 1][j - 1];
        }
    }
    int ans = n * n;
    for(int z = 1; z < n; z++) {
        if(n % z == 0) {
            short type = 1;
            int res1 = 0, res2 = 0;
            for(int i = z; i <= n; i += z) {
                for(int j = z; j <= n; j += z) {
                    if(type) {
                        res1 += pref[i][j] - pref[i][j - z] - pref[i - z][j] + pref[i - z][j - z];
                        res2 += z * z - (pref[i][j] - pref[i][j - z] - pref[i - z][j] + pref[i - z][j - z]);
                    } else {
                        res1 += z * z - (pref[i][j] - pref[i][j - z] - pref[i - z][j] + pref[i - z][j - z]);
                        res2 += pref[i][j] - pref[i][j - z] - pref[i - z][j] + pref[i - z][j - z];
                    }
                    type = 1 - type;
                }
            }
            ans = min(ans, min(res1, res2));
        }
    }
    cout << ans;
}

/*
5
2 8 5 1 10
5
2 3 5 3
2 5 3 3
1 4 4
2 3 4 2
1 1 2
*/

Compilation message (stderr)

chessboard.cpp:17:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   17 | main() {
      | ^~~~

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