题解 | #杨辉三角的变形#
杨辉三角的变形
https://www.nowcoder.com/practice/8ef655edf42d4e08b44be4d777edbf43
num = int(input().strip()) import sys a = num a1 = [2, 3, 2, 4] if a <= 2: print("-1") sys.exit() else: re1 = (a-2)%4 if re1 == 0: print('4') else: print(a1[re1-1])