shaer

摘要：Given a sorted array and a target value, return the index if the target is found. If not, return the index where it would be if it were inserted in or 阅读全文

摘要：Merge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes of the first two lists. Example: 阅读全文

摘要：这道题主要用栈来实现的。什么是栈呢，参照书上的后缀表达式的例子谈谈自己的理解，栈最明显的特征是先进后出。所以可以有效的结合题目中 （）对匹配问题，可以把从列表中获取的符号先存到栈中。 首先建个空列表用于映射栈中元素。然后挨个查询传递过来的列表的每个元素，不在栈中就压进栈，在的话再看看是不是栈顶元素。 阅读全文

摘要：Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would have ex 阅读全文