Submission #1134135

#	Time	Username	Problem	Language	Result	Execution time	Memory
1134135		hamzabc	Red-blue table (IZhO19_stones)	C++20	100 / 100	44 ms	1608 KiB

stones

#include <bits/stdc++.h>
 
 
using namespace std;
 
 
#define all(x) x.begin(), x.end()
#define mod 1000000007
#define sp << " " <<
#define endl << '\n'

/*
row -> +
col -> -
*/


long long int row, col;


void solve(){
	cin >> row >> col;
	bool rotated = row < col;
	if (rotated){
		swap(row, col);
	}
	cout << row + (row * ((col - 1) / 2)) / (row - (row - 1) / 2) endl;
	vector<vector<bool>> table(row, vector<bool>(col, false));
	set<pair<long long int, long long int>> cl;
	for (int i = (row * ((col - 1) / 2)) / (row - (row - 1) / 2); i > 0; i--){
		cl.insert({ 0, i - 1 });
	}
	vector<pair<long long int, long long int>> del;
	for (int i = 0; i < row; i++){
		for (int o = (col - 1) / 2; o > 0; o--){
			table[i][cl.begin()->second] = true;
			del.push_back({ cl.begin()->first + 1, cl.begin()->second });
			cl.erase(cl.begin());
		}
		for (auto k : del){
			cl.insert(k);
		}
		del.clear();
	}
	if (rotated)
		swap(col, row);
	for (int i = 0; i < row; i++){
		for (int o = 0; o < col; o++){
			if (rotated){
				if (table[o][i]){
					cout << "+";
				}else{
					cout << "-";
				}
			}else{
				if (table[i][o]){
					cout << "-";
				}else{
					cout << "+";
				}
			}
		}
		cout endl;
	}
	cout endl;
}


signed main() {
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	long long int Q;
	cin >> Q;
	while (Q--){
		solve();
	}
	return 0;
}

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