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. Please see below link for a solution that prints only distinct permutations even if there are duplicates in input. Given a non-negative integer n representing the total number of bits in the code, print the sequence of gray code. Ace your next coding interview by practicing our hand-picked coding interview questions. Given a word, find the lexicographically greater permutation of it. 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. Following is an interesting pattern in Gray Codes. View grayCode_leetcode_interviewBit.cpp The gray code is a binary numeral system where two successive values differ in only one bit. Learn and Practice on almost all coding interview questions asked historically and get referred to the best tech companies Conquer the fear of coding interview and land your dream job! For example, lexicographically next permutation of “gfg” is “ggf” and next permutation of “acb” is “bac”. Note : The above solution prints duplicate permutations if there are repeating characters in input string. 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. 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 For example, following are two solutions for 4 Queen problem. 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. 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. The above sequences are Gray Codes of different widths. n-bit Gray Codes can be generated … Note: In some cases, the next lexicographically greater word might not exist, e.g, “aaa” and “edcba” 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 that there are n! Rearranges the elements in the range [first,last) into the next lexicographically greater permutation. 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