题解 | #杨辉三角的变形#
杨辉三角的变形
https://www.nowcoder.com/practice/8ef655edf42d4e08b44be4d777edbf43
import sys
row=int(input())
if row==1 or row==2:
print(-1)
else:
if (row-2)%4==1:
print(2)
if (row-2)%4==2:
print(3)
if (row-2)%4==3:
print(2)
if (row-2)%4==0:
print(4)
