Submission #348415

#	Time	Username	Problem	Language	Result	Execution time	Memory
348415		Kevin_Zhang_TW	Red-blue table (IZhO19_stones)	C++17	11 / 100	40 ms	2028 KiB

stones

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define pb emplace_back
#define AI(i) begin(i), end(i)
template<class T> bool chmin(T &a, T b) { return b < a && (a = b, true); }
template<class T> bool chmax(T &a, T b) { return a < b && (a = b, true); }
#ifdef KEV
#define DE(args...) kout("[ " + string(#args) + " ] = ", args)
void kout() { cerr << endl; }
template<class T, class ...U> void kout(T a, U ...b) { cerr << a << ' ', kout(b...); }
template<class T> void debug(T L, T R) { while (L != R) cerr << *L << " \n"[next(L) == R], ++L; }
#else
#define DE(...) 0
#define debug(...) 0
#endif

const int MAX_N = 1010;

int n, m;
char w[MAX_N][MAX_N];
#define rev(w) (w == '+' ? '-' : '+')
void solve() {
	cin >> n >> m;

	bool rot = false;

	if (n > m) rot = true, swap(n, m);

	auto gen = [&]() {
		for (int i = 0;i < n;++i) for (int j = 0;j < m;++j)
			w[i][j] = '-';

		int res = m;

		vector<int> cnt(m);

		// height should < mxh
		int filwid = (m + 1) / 2, mxh = (n + 1) / 2;

		for (int i = 0, H = 0;i < n;++i) {
			bool todo = true;
			for (int j = 0;j < filwid;++j) 
				if (++cnt[ (H + j) % m ] == mxh)
					todo = false;
			if (!todo) break;

			for (int j = 0;j < filwid;++j) 
				w[i][ (H + j) % m ] = '+';

			H += filwid, H %= m;
			++res;

		}

		return res;
	};

	int cnt = gen();

	cout << cnt << '\n';

	if (rot) {
		swap(n, m);
		for (int i = 0;i < n;++i) {
			for (int j = 0;j < m;++j) 
				cout << rev(w[j][i]);
			cout << '\n';
		}
	}
	else {
		for (int i = 0;i < n;++i) {
			for (int j = 0;j < m;++j)
				cout << w[i][j] ;
			cout << '\n';
		}
	}
}
int32_t main() {
	ios_base::sync_with_stdio(0), cin.tie(0);
	int T;
	cin >> T;
	while (T--)
		solve();
}

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