Submission #556085

#	Time	Username	Problem	Language	Result	Execution time	Memory
556085		ngpin04	Red-blue table (IZhO19_stones)	C++14	15 / 100	40 ms	2564 KiB

stones

#include <bits/stdc++.h>
#define fi first
#define se second
#define mp make_pair
#define TASK ""
#define ALL(x) (x).begin(), (x).end() 
using namespace std;
template <typename T1, typename T2> bool mini(T1 &a, T2 b) {
	if (a > b) {a = b; return true;} return false;
}
template <typename T1, typename T2> bool maxi(T1 &a, T2 b) {
	if (a < b) {a = b; return true;} return false;
}
const int N = 2005;
const int oo = 1e9;
const long long ooo = 1e18;
const int mod = 1e9 + 7; // 998244353;
const long double pi = acos(-1);

int n,m;

char a[N][N];

int check(int cnt) {
	if (2 * cnt < m)
		return cnt + n;
	int x = (m / 2 + 1) - (m - cnt);
	int lef = (n - 1) >> 1;
	for (int i = n; i >= 0; i--) 
		if ((x * i + cnt - 1) / cnt <= lef)
			return i + cnt;
	assert(false);
	return -1;
}

void trace(int r, int c) {
	for (int i = 1; i <= n; i++)
	for (int j = 1; j <= m; j++)
		a[i][j] = 0;

	for (int i = 1; i <= n; i++)
	for (int j = c + 1; j <= m; j++)
		a[i][j] = '+';
	int x = (m / 2 + 1) - (m - c);

	if (x <= 0) {
		for (int j = 1; j <= c; j++)
		for (int i = 1; i <= n; i++) 
			a[i][j] = (i <= n / 2 + 1) ? '-' : '+';
		return;
	}

	for (int i = 1, cur = 1; i <= r; i++) {
		for (int t = 1; t <= x; t++) {
			a[i][cur] = '+';
			cur++;
			if (cur > c)
				cur = 1;
		}

		for (int j = 1; j <= c; j++)
			if (!a[i][j])
				a[i][j] = '-';
	}

	for (int j = 1; j <= c; j++) {
		int cnt = (n / 2 + 1);
		for (int i = 1; i <= r; i++) 
			cnt -= a[i][j] == '-';
		
		for (int i = r + 1; i <= n; i++) {
			if (cnt > 0) {
				a[i][j] = '-';
				cnt--;
			} else
				a[i][j] = '+';
		}
	}
}

void solve() {
	cin >> n >> m;

	int ans = 0;
	int res = 0;
	for (int i = 1; i <= m; i++)
		if (maxi(ans, check(i)))
			res = i;
	cout << ans << "\n";
	trace(ans - res, res);
	for (int i = 1; i <= n; i++, cout << "\n")
	for (int j = 1; j <= m; j++)
		cout << a[i][j];
}

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	#ifdef ONLINE_JUDGE
	// freopen(TASK".inp","r",stdin);
	// freopen(TASK".out","w",stdout);
	#endif
	int t; cin >> t;
	while (t--)
		solve();
	return 0;
}

• Subtask 1: 0 / 17
• Subtask 2: 0 / 10
• Subtask 3: 0 / 16
• Subtask 4: 0 / 11
• Subtask 5: 15 / 15
• Subtask 6: 0 / 31