题解 | #除自身以外数组的乘积#

#coding:utf-8
#
# 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
#
# 
# @param nums int整型一维数组 
# @return int整型一维数组
#
class Solution:
    def timesExceptSelf(self , nums ):
        # write code here
        #init
        n = len(nums)
        pres = [1 for i in range(n)]
        posts = [1 for i in range(n)]
        pre_pro = 1
        post_pro = 1
        for i in range(0, n):
            pre_pro = pre_pro * nums[i]
            pres[i] = pre_pro

            post_pro = post_pro * nums[n - 1  - i]
            posts[n - 1 - i] = post_pro
        res = [1 for i in range(n)]
        for i in range(0, n):
            if i == 0:
                pre_pro = 1
                post_pro = posts[i + 1]
            elif i == n - 1:
                pre_pro = pres[i - 1]
                post_pro = 1
            else:
                pre_pro = pres[i - 1]
                post_pro = posts[i + 1]
            pro = pre_pro *post_pro
            res[i] = pro
        print ("pres: ", pres)
        print ("posts: ", posts)
        print ("Res:", res)
        return res