Category: recursive

Any positive integers will become 1 following the steps: (1) divide by 2 if it is even (2) otherwise increment or decrement by 1. So the question is: could …

C++11 (formerly named C++0x) has some great new features to improve the code efficiency such as the use of auto which is the same as the var in C#, …

Given N natural integers (from 1 to N), the number of all permutations is N! (Factorial). That is explained by the fact: There are N choices when selecting the …

Given a linked list, swap every two adjacent nodes and return its head. You may not modify the values in the list’s nodes. Only nodes itself may be changed. …

Return the preorder traversal of a binary tree’s nodes’ values. The pre-order displays the root/current node’s value first, then recursively calling into its left sub tree and right sub …