关于#c++#的问题，请各位专家解答！

打印杨辉三角形
1
1 1
1 2 1
1 3 3 1
1 4 6 4 1
1 5 10 10 5 1

#include <stdio.h>
#define N 10
int main()
{
    int arr[N][N] = { 0 };
    int i = 0;
    for (i = 0; i < N; i++)
    {
        int m = 0;
        for (m = 0; m < N - i; m++)
        {
            printf("  ");
        }
        int j = 0;
        for (j = 0; j <= i; j++)
        {
            if ((0 == j) || (i == j))
            {
                arr[i][j] = 1;
            }
            else
            {
                arr[i][j] = arr[i - 1][j] + arr[i - 1][j - 1];
            }
            printf("%4d", arr[i][j]);
        }
        printf("\n");
    }
    return 0;
}