제출 #43746

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
43746		nickyrio	Chessboard (IZhO18_chessboard)	C++14	70 / 100	739 ms	46672 KiB

chessboard

#include <bits/stdc++.h>
#define FOR(i, a, b) for (int i = (a); i <= (b); ++i)
#define FORD(i, a, b) for (int i = (a); i >= (b); --i)
#define REP(i, a) for (int i = 0; i < (a); ++i)
#define DEBUG(x) { cerr << #x << '=' << x << endl; }
#define Arr(a, l, r) { cerr << #a << " = {"; FOR(_, l, r) cerr << ' ' << a[_]; cerr << "}\n"; }
#define N 1001000
#define pp pair<int, int>
#define endl '\n'
#define IO ios::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL)
#define taskname ""
#define bit(S, i) (((S) >> (i)) & 1)
using namespace std;
long long n, k, xx1[N], xx2[N], xy1[N], xy2[N];

long long solve(int l, int color) {// color = 0 -> Top-left is black
    long long ans = ((1ll * (n / l) * (n / l) + 1 - color) / 2) * l * l ;
    REP(i, k) {
        if (color ^ (((xx1[i] / l) % 2) == (xy1[i] / l) % 2)) ans--;
        else ans++;
    }
    return ans;
} 
int main() {
    #ifdef NERO
    freopen("test.inp","r",stdin);
    freopen("test.out","w",stdout);
    clock_t stime = clock();
    #endif //NERO
    IO;
    cin >> n >> k;
    long long ans = 1e18;
    REP(i, k) cin >> xx1[i] >> xy1[i] >> xx2[i] >> xy2[i];
    REP(i, k) xx1[i]--,xx2[i]--,xy1[i]--,xy2[i]--;
    FOR(i, 1, sqrt(n)) if (n % i == 0) {
        ans = min(ans, solve(i, 0));
        ans = min(ans, solve(i, 1));
        if (i != 1) ans = min(ans, solve(n / i, 0));
        if (i != 1) ans = min(ans, solve(n / i, 1));
    }
    cout << ans;
    #ifdef NERO
    clock_t etime = clock();
    cerr << "Execution time: " << (etime - stime) / CLOCKS_PER_SEC * 1000 << " ms.";
    #endif // NERO
}

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