北叶青藤

摘要： You are given several logs that each log contains a unique id and timestamp. Timestamp is a string that has the following format: Year:Month:Day:Hour: 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: You 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： Example : Infix : (A+B) * (C-D) ) Postfix: AB+CD-* 算法： 1. Scan the infix expression from left to right. 2. If the scanned character is an operand, app 阅读全文

摘要： Given a list of strings, output the most frequent characters that are in the same group as the letter. For example, for string "abc", a, b,c are in th 阅读全文

摘要： Your are given an array of positive integers nums. Count and print the number of (contiguous) subarrays where the product of all the elements in the s 阅读全文

摘要： You are given a string expression representing a Lisp-like expression to return the integer value of. The syntax for these expressions is given as fol 阅读全文

摘要： Implement FreqStack, a class which simulates the operation of a stack-like data structure. FreqStack has two functions: push(int x), which pushes an i 阅读全文

摘要： In a country popular for train travel, you have planned some train travelling one year in advance. The days of the year that you will travel is given 阅读全文

摘要： Given an array of integers A sorted in non-decreasing order, return an array of the squares of each number, also in sorted non-decreasing order. Examp 阅读全文