Binary Prefix Divisible By 5 找了半天规律，发现没意思。直接破解了。然后submit发现有overflow，看了下输入是个数组，那真是大。立刻想到取模。取模有分配律，对答案无影响 Date July 7, 2019 Category Leetcode Comments No Comments
Remove Outermost Parentheses 用一个count来计算”(“和”)”的差，0就是最外边的。 Date July 7, 2019 Category Leetcode Comments No Comments