We define a harmonious array is 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:
Input: [1,3,2,2,5,2,3,7] Output: 5 Explanation: The longest harmonious subsequence is [3,2,2,2,3].
Note: The length of the input array will not exceed 20,000.
public class Solution {public int FindLHS(int[] nums) {if (nums.Length == 0) {return 0;}Array.Sort(nums);Dictionary<int, int> dict = new Dictionary<int, int>();for(int i = 0; i < nums.Length; i++) {int num = nums[i];int val = 0;dict.TryGetValue(num, out val);if (val > 0) {dict[num]++;} else {dict[num] = 1;}}int sum = 0;int? lastKey = null;foreach(int i in dict.Keys) {if (lastKey == null) {lastKey = i;continue;}int lk = (int)lastKey;if (Math.Abs(i - lk) == 1) {sum = Math.Max(sum, dict[i] + dict[lk]);}lastKey = i;}return sum;}}
594. Longest Harmonious Subsequence 最长的和谐子序列
原文：http://www.cnblogs.com/xiejunzhao/p/ecf45ed8a3025727ae52d80614afef31.html