Longest Harmonious Subsequence – LeetCode Solution Java , Python 3, Python 2 , C , C++, Best and Optimal Solutions , All you need.
We define a harmonious array as an array where the difference between its maximum value and its minimum value is exactly 1.
Given an integer array nums, return the length of its longest harmonious subsequence among all its possible subsequences.
A subsequence of array is a sequence that can be derived from the array by deleting some or no elements without changing the order of the remaining elements.
Example 1:
Input: nums = [1,3,2,2,5,2,3,7] Output: 5 Explanation: The longest harmonious subsequence is [3,2,2,2,3].
Example 2:
Input: nums = [1,2,3,4] Output: 2
Example 3:
Input: nums = [1,1,1,1] Output: 0
Constraints:
1 <= nums.length <= 2 * 104-109 <= nums[i] <= 109
C++ Longest Harmonious Subsequence LeetCode Solution
int findLHS(vector<int>& nums) {
sort(nums.begin(),nums.end());
int len = 0;
for(int i = 1, start = 0, new_start = 0; i<nums.size(); i++)
{
if (nums[i] - nums[start] > 1)
start = new_start;
if (nums[i] != nums[i-1])
new_start = i;
if(nums[i] - nums[start] == 1)
len = max(len, i-start+1);
}
return len;
Java Longest Harmonious Subsequence LeetCode Solution
public int findLHS(int[] nums) {
Map<Long, Integer> map = new HashMap<>();
for (long num : nums) {
map.put(num, map.getOrDefault(num, 0) + 1);
}
int result = 0;
for (long key : map.keySet()) {
if (map.containsKey(key + 1)) {
result = Math.max(result, map.get(key + 1) + map.get(key));
}
}
return result;
}
Python 3 Longest Harmonious Subsequence LeetCode Solution
def findLHS(self, A):
count = collections.Counter(A)
ans = 0
for x in count:
if x+1 in count:
ans = max(ans, count[x] + count[x+1])
return ans
Array-1180
String-562
Hash Table-412
Dynamic Programming-390
Math-368
Sorting-264
Greedy-257
Depth-First Search-256
Database-215
Breadth-First Search-200
Tree-195
Binary Search-191
Matrix-176
Binary Tree-160
Two Pointers-151
Bit Manipulation-140
Stack-133
Heap (Priority Queue)-117
Design-116
Graph-108
Simulation-103
Prefix Sum-96
Backtracking-92
Counting-86
Sliding Window-73
Linked List-69
Union Find-66
Ordered Set-48
Monotonic Stack-47
Recursion-43
Trie-41
Binary Search Tree-40
Divide and Conquer-40
Enumeration-39
Bitmask-37
Queue-33
Memoization-32
Topological Sort-31
Geometry-30
Segment Tree-27
Game Theory-24
Hash Function-24
Binary Indexed Tree-21
Interactive-18
Data Stream-17
String Matching-17
Rolling Hash-17
Shortest Path-16
Number Theory-16
Combinatorics-15
Randomized-12
Monotonic Queue-9
Iterator-9
Merge Sort-9
Concurrency-9
Doubly-Linked List-8
Brainteaser-8
Probability and Statistics-7
Quickselect-7
Bucket Sort-6
Suffix Array-6
Minimum Spanning Tree-5
Counting Sort-5
Shell-4
Line Sweep-4
Reservoir Sampling-4
Eulerian Circuit-3
Radix Sort-3
Strongly Connected Componen-t2
Rejection Sampling-2
Biconnected Component-1
