Submission #1203989

#	Time	Username	Problem	Language	Result	Execution time	Memory
1203989		PlayVoltz	Red-blue table (IZhO19_stones)	C++20	In queue	0 ms	0 KiB

stones

#include <cstdio>
#include <stdio.h>
#include <stdbool.h>
#include <iostream>
#include <map>
#include <vector>
#include <climits>
#include <stack>
#include <string>
#include <queue>
#include <algorithm>
#include <set>
#include <unordered_set>
#include <unordered_map>
#include <cmath>
#include <cctype>
#include <bitset>
#include <iomanip>
#include <cstring>
#include <numeric>
#include <cassert>
using namespace std;

#define int long long
#define pii pair<int, int>
#define mp make_pair
#define pb push_back
#define fi first
#define se second

int32_t main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	int t;
	cin>>t;
	while (t--){
		int n, m;
		cin>>n>>m;
		bool rotate=0;
		if (n<m)swap(n, m), rotate=1;
		vector<vector<char> > res(n, vector<char>(m, '+'));
		int ans=n, c=0, x=0, y=0;
		for (int i=0; i<n*((m-1)/2); ++i){
			res[x][y]='-', ++c;
			if (c>=(n-(n-1)/2))c=0, ++y, ++ans;
			x=(x+1)%n;
		}
		cout<<ans<<"\n";
		if (!rotate)for (int i=0; i<n; ++i, cout<<"\n")for (int j=0; j<m; ++j)cout<<res[i][j];
		else for (int i=0; i<m; ++i, cout<<"\n")for (int j=0; j<n; ++j)cout<<(res[j][i]=='+'?'-':'+');
	}
}