随笔分类 - online judge：leetcode
摘要：Table holds the x coordinate of some points on x axis in a plane, which are all integers. Write a query to find the shortest distance between two poin
阅读全文
摘要：There is a robot starting at position (0, 0), the origin, on a 2D plane. Given a sequence of its moves, judge if this robot ends up at (0, 0) after it
阅读全文
摘要：There is a table A country is big if it has an area of bigger than 3 million square km or a population of more than 25 million. Write a SQL solution t
阅读全文
摘要：A binary tree is univalued if every node in the tree has the same value. Return if and only if the given tree is univalued. Example 1: Example 2: Note
阅读全文
摘要：In a array of size , there are unique elements, and exactly one of these elements is repeated N times. Return the element repeated times. Example 1: E
阅读全文
摘要：Given a binary matrix , we want to flip the image horizontally, then invert it, and return the resulting image. To flip an image horizontally means th
阅读全文
摘要：905. Sort Array By Parity Given an array of non negative integers, return an array consisting of all the even elements of , followed by all the odd el
阅读全文
摘要：709. To Lower Case Implement function ToLowerCase() that has a string parameter str, and returns the same string in lowercase. Example 1: Example 2: E
阅读全文
摘要：804. Unique Morse Code Words International Morse Code defines a standard encoding where each letter is mapped to a series of dots and dashes, as follo
阅读全文
摘要：929. Unique Email Addresses Every email consists of a local name and a domain name, separated by the @ sign. For example, in , is the local name, and
阅读全文
摘要：771. Jewels and Stones You're given strings representing the types of stones that are jewels, and representing the stones you have. Each character in
阅读全文