1 Initialize count: = 0 2 If integer n is not zero (a) Do bitwise & with (n-1) and assign the value back to n n: = n&(n-1) (b) Increment count by 1 (c) go to step 2 3 Else return count The beauty of this solution is the number of times it loops is equal to the number of set bits in a given integer. possible arrangements the elements can take (where N is the number of elements in the range). The solution discussed here is an extension of same approach. Given a number N, generate bit patterns from 0 to 2^N-1 such that successive patterns differ by one bit. Combination Sum II: Given a collection of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T. Each number in C may only be used once in the combination. Note : The above solution prints duplicate permutations if there are repeating characters in input string. The idea that if we have to find the max sum of contiguous subarray till index i, we calculate the max sum till index i-1 and add the array value at index i in this. Conquer the fear of coding interview and land your dream job! Given a non-negative integer n representing the total number of bits in the code, print the sequence of gray code. Learn and Practice on almost all coding interview questions asked historically and get referred to the best tech companies permutations and it requires O(n) time to print a a permutation. For example, following are two solutions for 4 Queen problem. The above sequences are Gray Codes of different widths. The interview would be through an in-site voice call, which ensures anonymity. View grayCode_leetcode_interviewBit.cpp The gray code is a binary numeral system where two successive values differ in only one bit. * Elements in a combination (a1, a2, … , ak) must be in non-descending order. Please see below link for a solution that prints only distinct permutations even if there are duplicates in input. public class Solution { public int add(int a, int b) { return a + b; } } For all of the problems of Bash on InterviewBit, incase you have to take input, please take it from file named 'input' (without quotes). Solution: Since the problem demands that the subarray should contain at least one element, in the base case where size of given array is one, then return this value. Given a word, find the lexicographically greater permutation of it. In this video, Vagish has explained the optimized approach for solving the question #Edit Distance from #InterviewBit. After completion you and your peer will be asked to share a detailed feedback. Note: In some cases, the next lexicographically greater word might not exist, e.g, “aaa” and “edcba” Note that there are n! 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