题目描述

blablabla

样例

#include <iostream>
using namespace std;
int main()
{
    int a;
    cin >> a;

    for (int b = 1; b <= (a + 1) / 2 ;b++)
    {
        for (int c = 0; c < (a + 1) / 2 - b; c++)
        {
            cout << " ";

        }
        for (int d = 0; d < 2*b-1; d++)
        {
            cout <<"*";
        }
        cout << endl;
    }
    for (int e = 1; e <=(a-1)/2; e++)
    {
        for (int f = 1; f<= e; f++)
        {
            cout << " ";
        }
        for (int g = 1; g <= 2 * ((a + 1) / 2 - e) - 1; g++)
        {
            cout << "*";
        }
        cout << endl;
    }

    return 0;
}

算法1

(暴力枚举) $O(n^2)$

blablabla

时间复杂度

参考文献

C++ 代码

blablabla

算法2

(暴力枚举) $O(n^2)$

blablabla

时间复杂度

参考文献

C++ 代码

blablabla