"""
杨辉三角
1
1 1
1 2 1
1 3 3 1
1 4 6 4 1
1 5 10 10 5 1
"""
def yanghuisanjiao(i,j):
"""
:param i:行
:param j: 列
:return:
"""
if i==j or j==1:
return 1
return yanghuisanjiao(i-1,j)+yanghuisanjiao(i-1,j-1)
a=yanghuisanjiao(5,2)
print(a)