随笔分类 - LeetCode
摘要：Given a string, your task is to count how many palindromic substrings in this string. The substrings with different start indexes or end indexes are c
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摘要：Given a sorted array consisting of only integers where every element appears twice except for one element which appears once. Find this single element
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摘要：Given a binary tree, find the leftmost value in the last row of the tree. Example 1: Example 2: Note: You may assume the tree (i.e., the given root no
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摘要：Given an array of integers, 1 ≤ a[i] ≤ n (n = size of array), some elements appear twice and others appear once. Find all the elements that appear twi
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摘要：Suppose you have a random list of people standing in a queue. Each person is described by a pair of integers (h, k), where h is the height of the pers
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摘要：Given a non negative integer number num. For every numbers i in the range 0 ≤ i ≤ num calculate the number of 1's in their binary representation and r
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摘要：Given an 2D board, count how many battleships are in it. The battleships are represented with 'X's, empty slots are represented with '.'s. You may ass
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摘要：Given two strings representing two complex numbers. You need to return a string representing their multiplication. Note i2 = -1 according to the defin
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摘要：A string S of lowercase letters is given. We want to partition this string into as many parts as possible so that each letter appears in at most one p
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摘要：Given two integers L and R, find the count of numbers in the range [L, R] (inclusive) having a prime number of set bits in their binary representation
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摘要：Given an integer array with no duplicates. A maximum tree building on this array is defined as follow: Construct the maximum tree by the given array a
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摘要：Given two lists Aand B, and B is an anagram of A. B is an anagram of A means B is made by randomizing the order of the elements in A. We want to find
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摘要：Find the largest palindrome made from the product of two n-digit numbers. Since the result could be very large, you should return the largest palindro
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摘要：Given a text file file.txt that contains list of phone numbers (one per line), write a one liner bash script to print all valid phone numbers. You may
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摘要：You are a product manager and currently leading a team to develop a new product. Unfortunately, the latest version of your product fails the quality c
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摘要：Description: Count the number of prime numbers less than a non-negative number, n. 使用sieve of Eratosthenes方法对质数进行筛选。 题目要求就是写出这个算法。 原理是：给出要筛数值的范围n，找出出以
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摘要：Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases. For example,"A man, a plan, a canal: Pan
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摘要：Given a non-empty array of integers, return the third maximum number in this array. If it does not exist, return the maximum number. The time complexi
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摘要：Given an array of integers and an integer k, you need to find the number of unique k-diff pairs in the array. Here a k-diff pair is defined as an inte
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摘要：You are given a license key represented as a string S which consists only alphanumeric character and dashes. The string is separated into N+1 groups b
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