摘要：
You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, the only constraint stopping yo 阅读全文
摘要：
Given a binary tree, return the vertical order traversal of its nodes' values. (ie, from top to bottom, column by column). If two nodes are in the sam 阅读全文
摘要：
Given an unsorted array return whether an increasing subsequence of length 3 exists or not in the array. Formally the function should: Your algorithm 阅读全文
摘要：
Given an unsorted array of integers, find the length of longest increasing subsequence. For example, Given [10, 9, 2, 5, 3, 7, 101, 18], The longest i 阅读全文
摘要：
You have a number of envelopes with widths and heights given as a pair of integers (w, h). One envelope can fit into another if and only if both the w 阅读全文