随笔分类 - LeetCode
摘要：Count and Say (E) 题目 The count-and-say sequence is the sequence of integers with the first five terms as following: 1. 1 2. 11 3. 21 4. 1211 5. 111221
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摘要：Rectangle Area (M) 题目 Find the total area covered by two rectilinear rectangles in a 2D plane. Each rectangle is defined by its bottom left corner and
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摘要：Game of Life (M) 题目 According to the Wikipedia's article: "The Game of Life, also known simply as Life, is a cellular automaton devised by the British
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摘要：Sudoku Solver (H) 题目 Write a program to solve a Sudoku puzzle by filling the empty cells. A sudoku solution must satisfy all of the following rules: E
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摘要：Valid Sudoku (M) 题目 Determine if a 9x9 Sudoku board is valid. Only the filled cells need to be validated according to the following rules: Each row mu
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摘要：Search Insert Position (E) 题目 Given a sorted array and a target value, return the index if the target is found. If not, return the index where it woul
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摘要：Find First and Last Position of Element in Sorted Array (M) 题目 Given an array of integers nums sorted in ascending order, find the starting and ending
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摘要：Find the Duplicate Number (M) 题目 Given an array nums containing n + 1 integers where each integer is between 1 and n (inclusive), prove that at least
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摘要：题目 Given an array of citations sorted in ascending order (each citation is a non-negative integer) of a researcher, write a function to compute the re
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摘要：Search in Rotated Sorted Array (M) 题目 Suppose an array sorted in ascending order is rotated at some pivot unknown to you beforehand. (i.e., [0,1,2,4,5
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摘要：Longest Valid Parentheses (H) 题目 Given a string containing just the characters '(' and ')', find the length of the longest valid (well-formed) parenth
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摘要：Next Permutation (M) 题目 Implement next permutation, which rearranges numbers into the lexicographically next greater permutation of numbers. If such a
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摘要：Substring with Concatenation of All Words (H) 题目 You are given a string, s, and a list of words, words, that are all of the same length. Find all star
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摘要：Divide Two Integers (M) 题目 Given two integers dividend and divisor, divide two integers without using multiplication, division and mod operator. Retur
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摘要：Implement strStr() (E) 题目 Implement strStr(). Return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack.
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摘要：Remove Element (E) 题目 Given an array nums and a value val, remove all instances of that value in-place and return the new length. Do not allocate extr
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摘要：Remove Duplicates from Sorted Array (E) 题目 Given a sorted array nums, remove the duplicates in-place such that each element appear only once and retur
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摘要：Nim Game (E) 题目 You are playing the following Nim Game with your friend: There is a heap of stones on the table, each time one of you take turns to re
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摘要：Word Pattern (E) 题目 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 bijec
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摘要：Peeking Iterator (M) 题目 Given an Iterator class interface with methods: next() and hasNext(), design and implement a PeekingIterator that support the
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