摘要：
本文还是总结自Jikai Tang的视频和个人主页 1. 相遇性问题 Leetcode 167. Two Sum II Leetcode 15. 3Sum. 注意如何避免取到重复的解。 阅读全文
摘要：
A peak element is an element that is greater than its neighbors. Given an input array where num[i] ≠ num[i+1], find a peak element and return its inde 阅读全文