摘要：
Implement a basic calculator to evaluate a simple expression string. The expression string may contain open ( and closing parentheses ), the plus + or 阅读全文
摘要：
Divide two integers without using multiplication, division and mod operator. If it is overflow, return MAX_INT. 1. nagitive 2. overflow Another exampl 阅读全文
摘要：
You are given two jugs with capacities x and y litres. There is an infinite amount of water supply available. You need to determine whether it is poss 阅读全文
摘要：
Given a collection of intervals, find the minimum number of intervals you need to remove to make the rest of the intervals non-overlapping. Note: Exam 阅读全文
摘要：
There are a number of spherical balloons spread in two-dimensional space. For each balloon, provided input is the start and end coordinates of the hor 阅读全文
摘要：
A linked list is given such that each node contains an additional random pointer which could point to any node in the list or null. Return a deep copy 阅读全文
摘要：
Given two numbers represented as strings, return multiplication of the numbers as a string. Note: The numbers can be arbitrarily large and are non-neg 阅读全文
摘要：
Given an integer, write an algorithm to convert it to hexadecimal. For negative integer, two’s complementmethod is used. Note: Example 1: Example 2: 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 inc 阅读全文
摘要：
Given an 2D board, count how many different battleships are in it. The battleships are represented with 'X's, empty slots are represented with '.'s. Y 阅读全文