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. A permutation is each one of the N! Learn and Practice on almost all coding interview questions asked historically and get referred to the best tech companies 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). Rearranges the elements in the range [first,last) into the next lexicographically greater permutation. 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 In this video, Vagish has explained the optimized approach for solving the question #Edit Distance from #InterviewBit. View grayCode_leetcode_interviewBit.cpp The gray code is a binary numeral system where two successive values differ in only one bit. Given a number N, generate bit patterns from 0 to 2^N-1 such that successive patterns differ by one bit. The interview would be through an in-site voice call, which ensures anonymity. Note that there are n! n-bit Gray Codes can be generated … After completion you and your peer will be asked to share a detailed feedback. In previous post, we have discussed an approach that prints only one possible solution, so now in this post the task is to print all solutions in N-Queen Problem. Note: * All numbers (including target) will be positive integers. The beauty of this solution is the number of times it loops is equal to the number of set bits in a given integer. Note: In some cases, the next lexicographically greater word might not exist, e.g, “aaa” and “edcba” For example, following are two solutions for 4 Queen problem. The above sequences are Gray Codes of different widths. Please see below link for a solution that prints only distinct permutations even if there are duplicates in input. Given a word, find the lexicographically greater permutation of it. Given a non-negative integer n representing the total number of bits in the code, print the sequence of gray code. The solution discussed here is an extension of same approach. 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. permutations and it requires O(n) time to print a a permutation. 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. 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