Submission #171121

#	Time	Username	Problem	Language	Result	Execution time	Memory
171121		donentseto	Red-blue table (IZhO19_stones)	C++14	11 / 100	30 ms	1400 KiB

stones

#include <bits/stdc++.h>
using namespace std;
int main (){

    ios::sync_with_stdio (false);
    cin.tie (0);

    int t;
    cin >> t;
    while (t --){
        int n, m;
        cin >> n >> m;
        if (n <= 2 && m >= n){
            cout << m << '\n';
            for (int i = 0; i < n; i ++){
                for (int j = 0; j < m; j ++) cout << '-';
                cout << '\n';
            }
        }
        else if (m <= 2){
            cout << n << '\n';
            for (int i = 0; i < n; i ++){
                for (int j = 0; j < m; j ++) cout << '+';
                cout << '\n';
            }
        }
        else if (n == 3 || n == 4){
            cout << m + 1 << '\n';
            for (int i = 0; i < m; i ++) cout << '+';
            cout << '\n';
            for (int i = 1; i < n; i ++){
                for (int i = 0; i < m; i ++) cout << '-';
                cout << '\n';
            }
        }
        else if (m == 3 || m == 4){
            cout << n + 1 << '\n';
            for (int i = 0; i < n; i ++){
                cout << '-';
                for (int j = 1; j < m; j ++) cout << '+';
                cout << '\n';
            }
        }
        else{
            cout << n - 2 + n % 2 + m - 2 + m % 2 << '\n';
            for (int i = 0; i < n; i ++){
                for (int j = 0; j < m; j ++){
                    if (i <= n >> 1 && j < m - 1 >> 1) cout << '-';
                    else if (i >= n - 1 >> 1 && j > m >> 1) cout << '-';
                    else cout << '+';
                }
                cout << '\n';
            }
        }
    }

}

Compilation message (stderr)

stones.cpp: In function 'int main()':
stones.cpp:48:46: warning: suggest parentheses around '-' inside '>>' [-Wparentheses]
                     if (i <= n >> 1 && j < m - 1 >> 1) cout << '-';
                                            ~~^~~
stones.cpp:49:37: warning: suggest parentheses around '-' inside '>>' [-Wparentheses]
                     else if (i >= n - 1 >> 1 && j > m >> 1) cout << '-';
                                   ~~^~~

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