随笔分类 - LeetCode
摘要：Rotate Image (M) 题目 You are given an n x n 2D matrix representing an image. Rotate the image by 90 degrees (clockwise). Note: You have to rotate the i
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摘要：Increasing Triplet Subsequence (M) 题目 Given an unsorted array return whether an increasing subsequence of length 3 exists or not in the array. Formall
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摘要：Intersection of Two Arrays II (E) 题目 Given two arrays, write a function to compute their intersection. Example 1: Input: nums1 = [1,2,2,1], nums2 = [2
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摘要：Permutations II (M) 题目 Given a collection of numbers that might contain duplicates, return all possible unique permutations. Example: Input: [1,1,2] O
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摘要：Permutations (M) 题目 Given a collection of distinct integers, return all possible permutations. Example: Input: [1,2,3] Output: [ [1,2,3], [1,3,2], [2,
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摘要：Jump Game II (H) 题目 Given an array of non-negative integers, you are initially positioned at the first index of the array. Each element in the array r
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摘要：Intersection of Two Arrays (E) 题目 Given two arrays, write a function to compute their intersection. Example 1: Input: nums1 = [1,2,2,1], nums2 = [2,2]
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摘要：Wildcard Matching (H) 题目 Given an input string (s) and a pattern (p), implement wildcard pattern matching with support for '?' and '*'. '?' Matches an
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摘要：Multiply Strings (M) 题目 Given two non-negative integers num1 and num2 represented as strings, return the product of num1 and num2, also represented as
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摘要：Trapping Rain Water (H) 题目 Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is
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摘要：Flatten Nested List Iterator (M) 题目 Given a nested list of integers, implement an iterator to flatten it. Each element is either an integer, or a list
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摘要：Integer Break (M) 题目 Given a positive integer n, break it into the sum of at least two positive integers and maximize the product of those integers. R
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摘要：Reverse Vowels of a String (E) 题目 Write a function that takes a string as input and reverse only the vowels of a string. Example 1: Input: "hello" Out
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摘要：Coin Change (M) 题目 You are given coins of different denominations and a total amount of money amount. Write a function to compute the fewest number of
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摘要：Reverse String (E) 题目 Write a function that reverses a string. The input string is given as an array of characters char[]. Do not allocate extra space
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摘要：Range Sum Query 2D - Immutable (M) 题目 Given a 2D matrix matrix, find the sum of the elements inside the rectangle defined by its upper left corner (ro
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摘要：Range Sum Query - Immutable (E) 题目 Given an integer array nums, find the sum of the elements between indices i and j (i ≤ j), inclusive. Example: Give
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摘要：First Missing Positive (H) 题目 Given an unsorted integer array, find the smallest missing positive integer. Example 1: Input: [1,2,0] Output: 3 Example
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摘要：Combination Sum II (M) 题目 Given a collection of candidate numbers (candidates) and a target number (target), find all unique combinations in candidate
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摘要：Combination Sum (M) 题目 Given a set of candidate numbers (candidates) (without duplicates) and a target number (target), find all unique combinations i
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