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456. Subsets Elements less than K.
Objective: Given an array of numbers and integer K. Your task is to find lengths of all the subsets which contain value K and all elements in the subset are less than equal to K.
Example:
Given Input: [1, 5, 2, 3, 8, 6, 2, 4, 9, 5, 2], and K = 5 Length of subsets(all elements <= k) which contains K: 6 Explanation: subset {1, 5, 2, 3} , length=4 subset {5, 2} , length=2 Output: 2+4 = 6 Given Input: [1, 5, 2, 3, 8, 6, 2, 4, 9, 5, 2], and K = 9 Length of subsets(all elements <= k) which contains K: 11 All elements are less than 9 so array length is our result.
Naive Approach: Use nested loops, get all the subsets with all the elements less than k and pick the ones which contain value k and add their length to answer.
Time Complexity: O(N^{2})
Better Approach:
 Initialize currentLength = 0, answer = 0, kPresent = false.
 Iterate through the input array.
 If current element is <= k
 Increment currentLength by 1.
 If current element == k, do kPresent = true.
 Else
 Check if kPresent = true then add currentLength to answer.
 Reset currentLength = 0, kPresent = false
 If current element is <= k
 Handle the edge case, if kPresent = true then add currentLength to answer.
 Return the answer.
Time Complexity: O(N)
Output:
Given Input: [1, 5, 2, 3, 8, 6, 2, 4, 9, 5, 2], and K = 5 Length of subsets(all elements <= k) which contains K: 6