oj.uz

Submission #495144

# Submission time Handle Problem Language Result Execution time Memory
495144 2021-12-18T05:39:00 Z Ierus Chessboard (IZhO18_chessboard) C++17
16 / 100
 32 ms 6676 KB 
#include<bits/stdc++.h>
/*
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
*/
using namespace std;
#pragma GCC optimize ("unroll-loops,Ofast,O3")
#pragma GCC target("avx,avx2,fma")
#define F first
#define S second
#define sz(x) (int)x.size()
#define pb push_back
#define int long long
#define eb emplace_back
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
#define NFS ios_base::sync_with_stdio(0) , cin.tie(0) , cout.tie(0) ;
#define file(s) if (fopen(s".in", "r")) freopen(s".in", "r", stdin), freopen(s".out", "w", stdout)
//#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
typedef long long ll;
const int E = 1e6+777;
const long long inf = 1e18+777;
const int N = 1e5+777;
const int MOD = 1e9+7;
vector<int> div(int x){
	vector<int> res = {1};
	for(int i = 2; i * i <= x; ++i){
		if(x % i == 0){
			res.pb(i);
			if(x / i != i)	
				res.pb(x/i);
		}
	}
	sort(all(res));
	return res;
}
struct block{
	int x1, y1, x2, y2;
	void read(){
		cin >> x1 >> y1 >> x2 >> y2;
	}
}a[N];
int n, k;
int get1(){
	int b[N][2]{};
	for(int i = 1; i <= k; ++i){
		++b[a[i].x1][a[i].y1&1];
	}
	int cnt1 = n * n / 2 + (n & 1);
	int cnt2 = n * n - cnt1;
	int sum1 = 0, sum2 = 0;
	for(int i = 1; i <= n; ++i){
		if(i & 1){
			sum1 += b[i][1];
			sum2 += b[i][0];
		}else{
			sum1 += b[i][0];
			sum2 += b[i][1];
		}
	}
	return min(cnt1 - sum1 + sum2, cnt2 - sum2 + sum1);
}
int pref[1111][1111], ar[1111][1111];
void precalc(){
	for(int l = 1; l <= k; ++l){
		ar[a[l].x1][a[l].y1] = 1;
	}
    for(int i = 1; i <= n; i++) {
        pref[i][1] = pref[i-1][1] + ar[i][1];
    }
    for(int i = 1; i <= n; i++) {
        pref[1][i] = pref[1][i-1] + ar[1][i];
    }
    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] + ar[i][j];
        }
    }
//    cerr << "array\n";
//    for(int i = 1; i <= n; ++i){
//    	for(int j = 1; j <= n; ++j){
//    		cerr << ar[i][j] << ' ';
//		}cerr << '\n';
//	}cerr << '\n';
//	cerr << "pref\n";
//    for(int i = 1; i <= n; ++i){
//    	for(int j = 1; j <= n; ++j){
//    		cerr << pref[i][j] << ' ';
//		}cerr << '\n';
//	}cerr << '\n';
}
long long query(int x1, int y1, int x2, int y2) {
    return pref[x2][y2] - pref[x1 - 1][y2] - pref[x2][y1 - 1] + pref[x1 - 1][y1 - 1];
}
int get2(vector<int> &d, int res = INT_MAX){
	precalc();
	for(auto x : d){
		int sum1 = 0, sum2 = 0, cnt1 = 0, cnt2 = 0;
		bool ok = 1;
		for(int i = 1; i <= n; i += x){
			for(int j = 1; j <= n; j += x, ok ^= 1){
				int x1 = i, y1 = j, x2 = i + x - 1, y2 = j + x - 1;
				int cur = query(x1, y1, x2, y2);
				if(ok & 1){
					sum1 += cur;
					cnt1 += x * x;
				}else{
					sum2 += cur;
					cnt2 += x * x;
				}
			}
		}
//		cerr << "X: " << x << " cnt1: " << cnt1 << " sum1: " << sum1 <<  " cnt2: " << cnt2 << " sum2: " << sum2 << '\n';
		res = min({res, cnt1 - sum1 + sum2, cnt2 - sum2 + sum1});
	}
	return res;
}
signed main(){auto solve=[&](){
	cin >> n >> k;
	for(int i = 1; i <= k; ++i){
		a[i].read();
	}
	vector<int> d = div(n);
//	cerr << "D: ";for(auto it : d){
//		cerr << it << ' ';
//	}cerr << '\n';
	if(sz(d) == 1){
		cout << get1() << '\n';	
	}else{
		cout << get2(d);
	}
};NFS;solve();}

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1868 KB Output is correct
2 Correct 1 ms 716 KB Output is correct
3 Correct 1 ms 716 KB Output is correct
4 Correct 1 ms 716 KB Output is correct
5 Correct 1 ms 1868 KB Output is correct
6 Correct 1 ms 716 KB Output is correct
7 Correct 1 ms 716 KB Output is correct
8 Correct 1 ms 716 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 19 ms 3776 KB Output is correct
2 Correct 7 ms 2752 KB Output is correct
3 Correct 14 ms 3932 KB Output is correct
4 Correct 15 ms 4176 KB Output is correct
5 Correct 19 ms 4804 KB Output is correct
6 Correct 13 ms 3676 KB Output is correct
7 Correct 4 ms 2248 KB Output is correct
8 Correct 13 ms 3780 KB Output is correct
9 Correct 32 ms 6676 KB Output is correct
10 Correct 16 ms 4576 KB Output is correct

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 972 KB Output is correct
2 Correct 1 ms 716 KB Output is correct
3 Correct 1 ms 972 KB Output is correct
4 Correct 1 ms 972 KB Output is correct
5 Correct 1 ms 972 KB Output is correct
6 Incorrect 1 ms 972 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #4
0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 972 KB Output is correct
2 Correct 1 ms 716 KB Output is correct
3 Correct 1 ms 972 KB Output is correct
4 Correct 1 ms 972 KB Output is correct
5 Correct 1 ms 972 KB Output is correct
6 Incorrect 1 ms 972 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #5
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 19 ms 3776 KB Output is correct
2 Correct 7 ms 2752 KB Output is correct
3 Correct 14 ms 3932 KB Output is correct
4 Correct 15 ms 4176 KB Output is correct
5 Correct 19 ms 4804 KB Output is correct
6 Correct 13 ms 3676 KB Output is correct
7 Correct 4 ms 2248 KB Output is correct
8 Correct 13 ms 3780 KB Output is correct
9 Correct 32 ms 6676 KB Output is correct
10 Correct 16 ms 4576 KB Output is correct
11 Correct 1 ms 972 KB Output is correct
12 Correct 1 ms 716 KB Output is correct
13 Correct 1 ms 972 KB Output is correct
14 Correct 1 ms 972 KB Output is correct
15 Correct 1 ms 972 KB Output is correct
16 Incorrect 1 ms 972 KB Output isn't correct
17 Halted 0 ms 0 KB -

Subtask #6
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1868 KB Output is correct
2 Correct 1 ms 716 KB Output is correct
3 Correct 1 ms 716 KB Output is correct
4 Correct 1 ms 716 KB Output is correct
5 Correct 1 ms 1868 KB Output is correct
6 Correct 1 ms 716 KB Output is correct
7 Correct 1 ms 716 KB Output is correct
8 Correct 1 ms 716 KB Output is correct
9 Correct 19 ms 3776 KB Output is correct
10 Correct 7 ms 2752 KB Output is correct
11 Correct 14 ms 3932 KB Output is correct
12 Correct 15 ms 4176 KB Output is correct
13 Correct 19 ms 4804 KB Output is correct
14 Correct 13 ms 3676 KB Output is correct
15 Correct 4 ms 2248 KB Output is correct
16 Correct 13 ms 3780 KB Output is correct
17 Correct 32 ms 6676 KB Output is correct
18 Correct 16 ms 4576 KB Output is correct
19 Correct 1 ms 972 KB Output is correct
20 Correct 1 ms 716 KB Output is correct
21 Correct 1 ms 972 KB Output is correct
22 Correct 1 ms 972 KB Output is correct
23 Correct 1 ms 972 KB Output is correct
24 Incorrect 1 ms 972 KB Output isn't correct
25 Halted 0 ms 0 KB -