https://pintia.cn/problem-sets/17/problems/260

 

#include 
     
      using namespace std;int main(){    int N;    char sign;    cin >> N >> sign;    int count = 1;    while (2 * count * count - 1 <= N)    {        count++;    }    count--;    for (int i = 0; i < 2 * count - 1; i++)    {        for (int j = 0; j < count - 1 - abs(count - 1 - i); j++)        {            printf(" ");        }        for (int j = 0; j < 2 * abs(count - 1 - i) + 1; j++)        {            printf("%c", sign);        }        printf("\n");    }    printf("%d", N - (2 * count * count - 1));    return 0;}