摘要： 题目：Remove the minimum number of invalid parentheses in order to make the input string valid. Return all possible results.Note: The input string may co... 阅读全文

摘要： 题目：Given an Iterator class interface with methods: next() and hasNext(), design and implement a PeekingIterator that support the peek() operation -- i... 阅读全文

摘要： 题目：Given an array nums, write a function to move all 0's to the end of it while maintaining the relative order of the non-zero elements.For example, g... 阅读全文