oj.uz

Submission #495054

# Submission time Handle Problem Language Result Execution time Memory
495054 2021-12-18T04:02:13 Z Ziel Chessboard (IZhO18_chessboard) C++17
39 / 100
 85 ms 6320 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)) {
    	vector<int> v(2);
    	for (int i = 1; i <= k; i++) {
    		v[(up[i] + left[i]) % 2]++;
    	}
    	cout << min(v[1] + (n / 2 - v[0]), v[0] + ((n + 1) / 2 - v[1]));
    }

/*
    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 solve()':
chessboard.cpp:73:10: warning: variable 'flag' set but not used [-Wunused-but-set-variable]
   73 |     bool flag = 1;
      |          ^~~~
chessboard.cpp: In function 'void setIO(const string&)':
chessboard.cpp:196:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  196 |         freopen((f + ".in").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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 + ".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 4 ms 4364 KB Output is correct
3 Correct 2 ms 4404 KB Output is correct
4 Correct 2 ms 4300 KB Output is correct
5 Correct 2 ms 4428 KB Output is correct
6 Correct 4 ms 4428 KB Output is correct
7 Correct 3 ms 4300 KB Output is correct
8 Correct 2 ms 4300 KB Output is correct

Subtask #2
0 / 8.0

# Verdict Execution time Memory Grader output
1 Incorrect 22 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 2 ms 4404 KB Output is correct
3 Correct 2 ms 4428 KB Output is correct
4 Correct 3 ms 4428 KB Output is correct
5 Correct 2 ms 4428 KB Output is correct
6 Correct 2 ms 4428 KB Output is correct
7 Correct 3 ms 4428 KB Output is correct
8 Correct 3 ms 4416 KB Output is correct
9 Correct 3 ms 4428 KB Output is correct
10 Correct 3 ms 4428 KB Output is correct
11 Correct 3 ms 4404 KB Output is correct
12 Correct 2 ms 4416 KB Output is correct
13 Correct 2 ms 4428 KB Output is correct
14 Correct 3 ms 4416 KB Output is correct
15 Correct 3 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 2 ms 4404 KB Output is correct
3 Correct 2 ms 4428 KB Output is correct
4 Correct 3 ms 4428 KB Output is correct
5 Correct 2 ms 4428 KB Output is correct
6 Correct 2 ms 4428 KB Output is correct
7 Correct 3 ms 4428 KB Output is correct
8 Correct 3 ms 4416 KB Output is correct
9 Correct 3 ms 4428 KB Output is correct
10 Correct 3 ms 4428 KB Output is correct
11 Correct 3 ms 4404 KB Output is correct
12 Correct 2 ms 4416 KB Output is correct
13 Correct 2 ms 4428 KB Output is correct
14 Correct 3 ms 4416 KB Output is correct
15 Correct 3 ms 4428 KB Output is correct
16 Correct 16 ms 5104 KB Output is correct
17 Correct 33 ms 6028 KB Output is correct
18 Correct 61 ms 6236 KB Output is correct
19 Correct 85 ms 6300 KB Output is correct
20 Correct 82 ms 6320 KB Output is correct
21 Correct 40 ms 5936 KB Output is correct
22 Correct 31 ms 4548 KB Output is correct
23 Correct 36 ms 5392 KB Output is correct
24 Correct 41 ms 6192 KB Output is correct
25 Correct 19 ms 4676 KB Output is correct
26 Correct 24 ms 5652 KB Output is correct
27 Correct 37 ms 5772 KB Output is correct
28 Correct 48 ms 6268 KB Output is correct
29 Correct 24 ms 5244 KB Output is correct
30 Correct 11 ms 4508 KB Output is correct

Subtask #5
0 / 23.0

# Verdict Execution time Memory Grader output
1 Incorrect 22 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 4 ms 4364 KB Output is correct
3 Correct 2 ms 4404 KB Output is correct
4 Correct 2 ms 4300 KB Output is correct
5 Correct 2 ms 4428 KB Output is correct
6 Correct 4 ms 4428 KB Output is correct
7 Correct 3 ms 4300 KB Output is correct
8 Correct 2 ms 4300 KB Output is correct
9 Incorrect 22 ms 5324 KB Output isn't correct
10 Halted 0 ms 0 KB -