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Each number in candidates may only be used once in the combination. Note: • All numbers (including target) will be positive integers. • The…

Example: Input: [ 1->4->5, 1->3->4, 2->6 ] Output: 1->1->2->3->4->4->5->6 This problem can be solved by…

Problem explanation: Initial Sorted array: [0,1,2,4,5,6,7] After rotation it becomes [4,5,6,7,0,1,2]. Target = 0 Index = 4 [as array index…

If such arrangement is not possible, it must rearrange it as the lowest possible order (ie, sorted in ascending order). Examples: Input ->…

Return the quotient after dividing dividend by divisor. The integer division should truncate toward zero. Example 1: Input: dividend = 10,…

Given a linked list, swap every two adjacent nodes and return its head. Example: Given 1->2->3->4, you should return the list as…

Note:  1. Need merged elements in a new list, not in the existing list. Example: Input: 1->2->4, 1->3->4 Output:…

For example, given n = 3, a solution set is: [ "((()))", "(()())", "(())()", "()(())",…

Problem statement: Given a string containing digits from 2-9 inclusive, return all possible letter combinations that the number could…

Problem description: Given a linked list, remove the n-th node from the end of list and return its head. Example: Given linked list:…