594.Longest Harmonious Subsequence - Leetcode题解

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7.Reverse Integer

9.Palindrome Number

13.Roman to Integer

19.Remove Nth Node from End of List

20.Valid Parentheses

21.Merge Two Sorted Lists

22.Generate Parentheses

26.Remove Duplicates from Sorted Array

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28.Implement strStr()

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38.Count and Say

46.Permutations

53.Maximum Subarray

58.Length of Last Word

59.Spiral Matrix II

70.Climbing Stairs

77.Combinations

83.Remove Duplicates from Sorted List

88.Merge Sorted Array

104.Maximum Depth of Binary Tree

107.Binary Tree Level Order Traversal II

108.Convert Sorted Array to Binary Search Tree

101.Symmetric Tree

105.Construct Binary Tree from Preorder and Inorder Traversal

110.Balanced Binary Tree

111.Minimum Depth of Binary Tree

118.Pascals Triangle

119.Pascals Triangle II

121.Best Time to Buy and Sell Stock

125.Valid Palindrome

131.Palindrome Partitioning

140.Word Break II

141.Linked List Cycle

143.Reorder List

167.Two Sum II- Input Array is Sorted

168.Excel Sheet Column Title

169.Majority Element

171.Excel Sheet Column Number

172.Factorial Trailing Zeroes

175.Combine Two Tables

181.Employee Earning More Than Their Managers

182.Duplicate Emails

183.Customers Who Never Order

189.Rotate Array

191.Number of 1 Bits

193.Valid Phone Numbers

196.Delete Duplicate Emails

197.Rising Temperature

198.House Robber

202.Happy Number

203.Remove Linked List Elements

204.Count Primes

205.Isomorphic Strings

206.Reverse Linked List

217.Contains Duplicate

219.Contains Duplicate II

225.Implement Stack Using Queues

226.Invert Binary Tree

231.Power of Two

232.Implement Queue Using Stack

234.Palindrome Linked List

237.Delete Node in a Linked List

240.Search a 2D Matrix II

242.Valid Anagram

257.Binary Tree Paths

263.Ugly Numbers

268.Missing Number

278.First Bad Version

284.Peeking Iterator

290.Word Pattern

303.Range Sum Query Immutable

338.Counting Bits

342.Power of Four

344.Reverse String

345.Reverse Vowels of a String

349.Intersection of Two Arrays

350.Intersection of Two Arrays II

367.Valid Perfect Square

371.Sum of Two Integers

374.Guess Number Higher or Lower

383.Ransom Note

387.First Unique Character in a String

401.Binary Watch

404.Sum of Left Leaves

405.Convert A Number to Hexadecimal

409.Longest Palindrome

414.Third Maximum Number

415.Add Strings

427.Construct Quad Tree

429.N Ary Tree Level Order Traversal

434.Number of Segments in a String

437.Path Sum III

438.Find All Anagrams in a String

441.Arranging Coins

443.String Compression

447.Number of Boomerangs

448.Find All Numbers Disappeared in an Array

453.Minimum Moves to Equal Array Elements

455.Assign Cookies

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461.Hamming Distance

463.Island Perimeter

476.Number Complement

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532.K-diff Pairs in an Array

535.Encode and Decode TinyURL

538.Convert BST to Greater Tree

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543.Diameter of Binary Tree

551.Student Attendace Record I

557.Reverse Words in a String

558.Quad Tree Intersection

559.Maxmium Depth of N Ary Tree

561.Array Partition I

563.Binary Tree Tilt

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572.Subtree of Another Tree

575.Distribute Candies

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590.N Ary Tree Postorder Traversal

594.Longest Harmonious Subsequence

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627.Swap Salary

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637.Average of Levels in Binary Tree

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645.Set Mismatch

653.Two Sum IV - Input is a BST

654.Maximum Binary Tree

657.Robot Return to Origin

661.Image Smoother

665.Non-Decreasing Array

669.Trim a Binary Search Tree

671.Second Minimum Node in a Binary Tree

680.Valid Palindrome II

682.Baseball Game

686.Repeated String Match

687.Longest Univalue Path

690.Employee Importance

693.Binary Number with Alternating Bits

696.Count Binary Substring

697.Degree of an Array

700.Search in a Binary Search Tree

701.Insert Into a Binary Search Tree

703.Kth Largest Element in a Stream

704.Binary Search

705.Design Hashset

706.Design Hashmap

707.Design Linked List

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713.Subarray Product Less Than K

717.1 Bit and 2 Bit Characters

720.Longest Word in Dictionary

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728.Self Dividing Numbers

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746.Min Cost Climbing Stairs

747.Largest Number At Least Twice Of Others

748.Shortest Completing Word

754.Reach A Number

762.Prime Number of Set Bits in Binary Representation

766.Toeplitz Matrix

771.Jewels and Stones

783.Minimum Distance Between BST Nodes

784.Letter Case Permutation

788.Rotated Digits

796.Rotate String

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806.Number of Lines to Write String

807.Max Increase to Keep City Skyline

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814.Binary Tree Pruning

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829.Consecutive Numbers Sum

830.Position of Large Groups

831.Masking Personal Information

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833.Find And Replace in String

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836.Rectangle Overlap

840.Magic Squares In Grid

844.Backspace String Compare

848.Shifting Letters

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859.Buddy Strings

860.Lemonade Change

861.Score After Flipping Matrix

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888.Fair Candy Swap

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897.increasing order search tree

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901.Online Stock Span

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910.Smallest Range II

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994.Rotting Oranges

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999.Available Captures for Rook

1002.Find Common Characters

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1395.Count Number of Teams

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面试题 16.18

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594.Longest Harmonious Subsequence

594.Longest Harmonious Subsequence
难度:Easy
We define a harmounious array as an array where the difference between its maximum value and its minimum value is exactly 1.
Now, given an integer array, you need to find the length of its longest harmonious subsequence among all its possible subsequences.
Example 1:
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Input: [1,3,2,2,5,2,3,7]
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Output: 5
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Explanation: The longest harmonious subsequence is [3,2,2,2,3].
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Note: The length of the input array will not exceed 20,000.
采用hashMap统计每个数出现的次数，然后比较相邻两个数出现次数之和，求出最大值即可。
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class Solution {
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public:
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    int findLHS(vector<int>& nums) {
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        if(nums.empty()  || nums.size()==1) return 0;
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        int res=0;
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        unordered_map<int,int> cnt;
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        for(int i=0;i<nums.size();i++)
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            ++cnt[nums[i]];
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        cout<<cnt.size()<<endl;
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        for(auto start=cnt.begin();start!=cnt.end();start++)
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        {
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            if(cnt.count(start->first+1))
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            res=max(res,start->second+cnt[start->first+1]);
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            if(cnt.count(start->first-1))
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            res=max(res,start->second+cnt[start->first-1]);
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          //  cout<< res<<endl;
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        }
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        return res;
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    }
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};
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执行用时 :116 ms, 在所有 C++ 提交中击败了80.28%的用户
内存消耗 :19.6 MB, 在所有 C++ 提交中击败了76.63%的用户

590.N Ary Tree Postorder Traversal

595.Big Countires

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