Reverse digits of an integer.

Determine whether an integer is a palindrome. Do this without extra space. A palindrome integer is an integer x for which reverse(x) = x whe

A robot is located at the top-left corner of an A x B grid. The robot can only move either down or right at any point in time. The robot is

There are A cities numbered from 1 to A. You have already visited M cities, the indices of which are given in an array B of M integers.

Given a positive integer A, return its corresponding column title as appear in an Excel sheet.

Given a column title A as appears in an Excel sheet, return its corresponding column number.

Rearrange a given array so that Arr[i] becomes Arr[Arr[i]] with O(1) extra space.

Given a set of digits (A) in sorted order, find how many numbers of length B are possible whose value is less than number C.

Given a positive integer which fits in a 32 bit signed integer, find if it can be expressed as A^P where P > 1 and A > 0. A and P both shoul

Given a positive integer A, return an array of strings with all the integers from 1 to N. But for multiples of 3 the array should have