1006. Clumsy Factorial
Description
Intuition
Check Solution 2, Improve to O(1)
里面有个技巧helper((N - 2) % 4 + 2)
0 -> 0
1 -> 1
2 -> 2
3 -> 3
4 -> 4
5 -> 5
6 -> 2
7 -> 3
转化成从5开始的，4个一循环
Check Solution 2, Improve to O(1)
里面有个技巧helper((N - 2) % 4 + 2)
0 -> 0
1 -> 1
2 -> 2
3 -> 3
4 -> 4
5 -> 5
6 -> 2
7 -> 3
转化成从5开始的，4个一循环