随笔分类 - LeetCode Solutions - Easy
摘要：Problem: Design a logger system that receive stream of messages along with its timestamps, each message should be printed if and only if it is not pri
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摘要：Problem: Count the number of prime numbers less than a non-negative number, n. Summary: 判断小于某非负数n的质数个数。 Solution: 用所谓的“刷质数表”的方式先用HashTable记录小于n的所有数是质数
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摘要：Problem: Given two strings s and t, determine if they are isomorphic. Two strings are isomorphic if the characters in s can be replaced to get t. All
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摘要：Problem: You are playing the following Bulls and Cows game with your friend: You write down a number and ask your friend to guess what the number is.
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摘要：Problem: Given a pattern and a string str, find if str follows the same pattern. Here follow means a full match, such that there is a bijection betwee
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摘要：Problem: Determine if a Sudoku is valid, according to: Sudoku Puzzles - The Rules. The Sudoku board could be partially filled, where empty cells are f
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摘要：Problem: Given a non-negative number represented as an array of digits, plus one to the number. The digits are stored such that the most significant d
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摘要：Problem: Given two sorted integer arrays nums1 and nums2, merge nums2 into nums1 as one sorted array. Note:You may assume that nums1 has enough space
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摘要：Problem: Given an array and a value, remove all instances of that value in place and return the new length. Do not allocate extra space for another ar
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摘要：Problem: Given a sorted array, remove the duplicates in place such that each element appear only once and return the new length. Do not allocate extra
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摘要：Problem: Given an array of integers where 1 ≤ a[i] ≤ n (n = size of array), some elements appear twice and others appear once. Find all the elements o
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摘要：Problem: Given an array of integers and an integer k, find out whether there are two distinct indices i and j in the array such that nums[i] = nums[j]
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摘要：Problem: Given numRows, generate the first numRows of Pascal's triangle. For example, given numRows = 5,Return Summary: 输出杨辉三角的前n行。 Solution: 方法类似于Lee
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摘要：Problem: Given an index k, return the kth row of the Pascal's triangle. For example, given k = 3,Return [1,3,3,1]. Note:Could you optimize your algori
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摘要：Problem: Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input woul
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摘要：Problem: 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
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摘要：Problem: Given a non-empty string check if it can be constructed by taking a substring of it and appending multiple copies of the substring together.
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摘要：Problem: Assume you are an awesome parent and want to give your children some cookies. But, you should give each child at most one cookie. Each child
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摘要：Problem: You are given a map in form of a two-dimensional integer grid where 1 represents land and 0 represents water. Grid cells are connected horizo
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摘要：Problem: Given a string which consists of lowercase or uppercase letters, find the length of the longest palindromes that can be built with those lett
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