Submission #1138668

#	Time	Username	Problem	Language	Result	Execution time	Memory
1138668		AHOKA	Red-blue table (IZhO19_stones)	C++20	15 / 100	66 ms	4676 KiB

stones

#pragma GCC optimize("O3") 

#include <bits/stdc++.h>

using namespace std;
 
#define threesum cin.tie(NULL); cout.tie(NULL); ios_base::sync_with_stdio(false)
#define all(a) a.begin(), a.end()
#define F first
#define S second
#define int long long
#define double long double
#define pii pair<int, int>
#define ppp pair<int, pii>
#define dout cout << fixed << setprecision(15)
#define mid ((l + r) / 2)
#define lc (2 * id)
#define rc (lc + 1)

const int maxn = 2e5 + 10, maxm = 5e3 + 10, oo = 1e18 + 10, lg = 18, sq = 350, mod = 998244353;

int n, m;

bool ans[maxm][maxm];

signed main()
{
	threesum;
    int t;
    cin >> t;
    while(t--){
        cin >> n >> m;

        if(n != m){
            cout << 1 / 0;
            exit(0);
        }

        for (int i = 1; i <= n;i++)
            for (int j = 1; j <= m;j++)
                ans[i][j] = 0;

        int k = n + ((n * ((n + 1) / 2 - 1)) / ((n / 2) + 1));

        cout << k << "\n";

        set<pii> s;

        for (int i = 1; i <= n;i++)
            s.insert({0, i});

        for (int j = 1; j <= k - n;j++){
            int x = n / 2 + 1;
            while(x--){
                auto [cnt, i] = *s.begin();
                s.erase({cnt, i});

                ans[i][j] = 1;

                s.insert({cnt + 1, i});
            }
        }

        for (int i = 1; i <= n;i++){
            for (int j = 1; j <= m;j++)
                cout << (ans[i][j] ? '-' : '+');
            cout << "\n";
        }
    }
}
/*
++-
++-
+++

++-+-
+++--
+++--
++--+
++-++

n*n = n + 
*/

Compilation message (stderr)

stones.cpp: In function 'int main()':
stones.cpp:35:23: warning: division by zero [-Wdiv-by-zero]
   35 |             cout << 1 / 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