oj.uz

Submission #495058

# Submission time Handle Problem Language Result Execution time Memory
495058 2021-12-18T04:06:31 Z Ziel Chessboard (IZhO18_chessboard) C++17
39 / 100
 82 ms 5964 KB 
/**
 * LES GREATEABLES BRO TEAM
**/

#include <bits/stdc++.h>

using namespace std;

using ll = long long;
#define sz(x) (int)x.size()
const bool FLAG = false;
void setIO(const string &f = "");

string to_string(const string s) {
	return '"' + s + '"';
}
string to_string(const char c) {
 	return char(39) + string(1, c) + char(39);
}
string to_string(const char* s) {
 	return to_string(string(s));
}
string to_string(bool f) {
	return (f ? "true" : "false");
}
template<class A, class B>
string to_string(const pair<A, B> x) {
	return "(" + to_string(x.first) + ", " + to_string(x.second) + ")";
}
template<class A, class B, class C>
string to_string(const tuple<A, B, C> x) {
	return "(" + to_string(get<0>(x)) + ", " + to_string(get<1>(x)) + ", " + to_string(get<2>(x)) + ")";
}
template<class A, class B, class C, class D>
string to_string(const tuple<A, B, C, D> x) {
	return "(" + to_string(get<0>(x)) + ", " + to_string(get<1>(x)) + ", " + to_string(get<2>(x)) + ", " + to_string(get<3>(x)) + ")";
}
template<class T>
string to_string(const T v) {
	string res = "{"; bool f = true;
	for (auto x: v)
		res += (f ? to_string(x) : ", " + to_string(x)), f = false;
	return res + "}";
}
void debug_args() { cerr << "]\n"; }
template<class H, class... T>
void debug_args(H x, T... y) {
	cerr << to_string(x);
	if (sizeof... (y))
	cerr << ", ";
	debug_args(y...);
}

#ifdef LOCAL
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]: [", debug_args(__VA_ARGS__);
#else
#define debug(...) 47
#endif

bool is_prime(int x) {
	if (x <= 1)
		return false;
	for (int i = 2; i * i <= x; i++)
		if (x % i == 0)
			return false;
	return true;
}

void solve() {
    int n, k;
    cin >> n >> k;
    vector<int> up(k + 1), left(k + 1), down(k + 1), right(k + 1);
    bool flag = 1;
    vector<vector<int>> a(1020, vector<int>(1020));
    for (int i = 1; i <= k; i++) {
    	cin >> up[i] >> left[i] >> down[i] >> right[i];
    	if (up[i] != down[i] || left[i] != right[i])
    		flag = 0;
    	if (n <= 1000) {
    		for (int ii = up[i]; ii <= down[i]; ii++)
    			for (int jj = left[i]; jj <= right[i]; jj++)
    				a[ii][jj] = 1;
    	}
    }

    if (n <= 1000) {
    	int ans = n * n * 3;
    	for (int len = 1; len * len <= n; len++) {
    		if (n % len == 0) {
    			int turn = 0, cur = 0, st_turn = 0;
    			for (int i = 1; i <= n; i += len) {
    				turn = st_turn;
 					st_turn ^= 1;
    				for (int j = 1; j <= n; j += len) {
    					for (int ii = i; ii < i + len; ii++) {
    						for (int jj = j; jj < j + len; jj++) {
    							if (a[ii][jj] != turn)
    								cur++;
    						}
    					}
    					turn ^= 1;
    				}
    			}
    			ans = min(ans, cur);

    			cur = 0, st_turn = 1;
    			for (int i = 1; i <= n; i += len) {
    				turn = st_turn;
 					st_turn ^= 1;
    				for (int j = 1; j <= n; j += len) {
    					for (int ii = i; ii < i + len; ii++) {
    						for (int jj = j; jj < j + len; jj++) {
    							if (a[ii][jj] != turn)
    								cur++;
    						}
    					}
    					turn ^= 1;
    				}
    			}
    			ans = min(ans, cur);


				if (len != 1) {
	    			int len2 = n / len;
    				st_turn = 0, cur = 0;
    				for (int i = 1; i <= n; i += len2) {
    					turn = st_turn;
 						st_turn ^= 1;
    					for (int j = 1; j <= n; j += len2) {
    						for (int ii = i; ii < i + len2; ii++) {
    							for (int jj = j; jj < j + len2; jj++) {
    								if (a[ii][jj] != turn)
    									cur++;
	    						}
    						}
    						turn ^= 1;
    					}
    				}
	    			ans = min(ans, cur);

    				cur = 0, st_turn = 1;
    				for (int i = 1; i <= n; i += len2) {
    					turn = st_turn;
 						st_turn ^= 1;
    					for (int j = 1; j <= n; j += len2) {
    						for (int ii = i; ii < i + len2; ii++) {
    							for (int jj = j; jj < j + len2; jj++) {
    								if (a[ii][jj] != turn)
    									cur++;
	    						}
    						}
    						turn ^= 1;
    					}
    				}
	    			ans = min(ans, cur);
				}
    		}
    	}
    	cout << ans;
    }

    else if (is_prime(n)) {
    	assert(flag);
    	vector<ll> v(2);
    	for (int i = 1; i <= k; i++) {
    		v[(up[i] + left[i]) % 2]++;
    	}
    	cout << min(v[0] + ((n * n) / 2 - v[1]), v[1] + ((n * n + 1) / 2 - v[0]));
    }

/*
    else if (flag) {
    	for (int i = 1; i <= k; i++) {
    		a[up[i]][left[i]] = 1;
    	}
    }*/
}

signed main() {
    setIO();
    
    int tt = 1;
    if (FLAG) {
    	cin >> tt;
    }
    while (tt--) {
    	solve();
    }
    
    return 0;
}

void setIO(const string &f) {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    if (fopen((f + ".in").c_str(), "r")) {
        freopen((f + ".in").c_str(), "r", stdin);
        freopen((f + ".out").c_str(), "w", stdout);
    }
}

Compilation message

chessboard.cpp: In function 'void setIO(const string&)':
chessboard.cpp:197:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  197 |         freopen((f + ".in").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
chessboard.cpp:198:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  198 |         freopen((f + ".out").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4300 KB Output is correct
2 Correct 2 ms 4300 KB Output is correct
3 Correct 2 ms 4300 KB Output is correct
4 Correct 2 ms 4300 KB Output is correct
5 Correct 2 ms 4300 KB Output is correct
6 Correct 3 ms 4300 KB Output is correct
7 Correct 2 ms 4300 KB Output is correct
8 Correct 3 ms 4300 KB Output is correct

Subtask #2
0 / 8.0

# Verdict Execution time Memory Grader output
1 Incorrect 21 ms 5324 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4428 KB Output is correct
2 Correct 3 ms 4300 KB Output is correct
3 Correct 3 ms 4428 KB Output is correct
4 Correct 2 ms 4428 KB Output is correct
5 Correct 3 ms 4428 KB Output is correct
6 Correct 2 ms 4408 KB Output is correct
7 Correct 3 ms 4428 KB Output is correct
8 Correct 2 ms 4428 KB Output is correct
9 Correct 2 ms 4428 KB Output is correct
10 Correct 2 ms 4360 KB Output is correct
11 Correct 2 ms 4428 KB Output is correct
12 Correct 3 ms 4428 KB Output is correct
13 Correct 2 ms 4428 KB Output is correct
14 Correct 2 ms 4428 KB Output is correct
15 Correct 2 ms 4428 KB Output is correct

Subtask #4
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4428 KB Output is correct
2 Correct 3 ms 4300 KB Output is correct
3 Correct 3 ms 4428 KB Output is correct
4 Correct 2 ms 4428 KB Output is correct
5 Correct 3 ms 4428 KB Output is correct
6 Correct 2 ms 4408 KB Output is correct
7 Correct 3 ms 4428 KB Output is correct
8 Correct 2 ms 4428 KB Output is correct
9 Correct 2 ms 4428 KB Output is correct
10 Correct 2 ms 4360 KB Output is correct
11 Correct 2 ms 4428 KB Output is correct
12 Correct 3 ms 4428 KB Output is correct
13 Correct 2 ms 4428 KB Output is correct
14 Correct 2 ms 4428 KB Output is correct
15 Correct 2 ms 4428 KB Output is correct
16 Correct 15 ms 4812 KB Output is correct
17 Correct 26 ms 5780 KB Output is correct
18 Correct 35 ms 5964 KB Output is correct
19 Correct 82 ms 5832 KB Output is correct
20 Correct 78 ms 5964 KB Output is correct
21 Correct 35 ms 5708 KB Output is correct
22 Correct 36 ms 4428 KB Output is correct
23 Correct 27 ms 5068 KB Output is correct
24 Correct 32 ms 5836 KB Output is correct
25 Correct 17 ms 4556 KB Output is correct
26 Correct 24 ms 5324 KB Output is correct
27 Correct 30 ms 5508 KB Output is correct
28 Correct 41 ms 5836 KB Output is correct
29 Correct 13 ms 4940 KB Output is correct
30 Correct 10 ms 4428 KB Output is correct

Subtask #5
0 / 23.0

# Verdict Execution time Memory Grader output
1 Incorrect 21 ms 5324 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4300 KB Output is correct
2 Correct 2 ms 4300 KB Output is correct
3 Correct 2 ms 4300 KB Output is correct
4 Correct 2 ms 4300 KB Output is correct
5 Correct 2 ms 4300 KB Output is correct
6 Correct 3 ms 4300 KB Output is correct
7 Correct 2 ms 4300 KB Output is correct
8 Correct 3 ms 4300 KB Output is correct
9 Incorrect 21 ms 5324 KB Output isn't correct
10 Halted 0 ms 0 KB -