Practice coding challenges
8 problems
You are climbing a staircase. It takes n steps to reach the …
Given two positive integers a and b, find their Greatest Common Divisor …
Given digits representing a non-negative integer, return the integer plus one.
Given distinct numbers in [0, n], return the missing number.
Determine if n is a happy number.
Return true if num is a perfect square.
There is a robot on an m x n grid. The robot …
Return number of structurally unique BSTs that store values 1..n.