Simplify Path

You are given a path to a file as a string. The path can contain the symbols: “..” for the parent directory and “.” for the current directory. Convert the path into its simplified form.

Find Leaves of Binary Tree

Given a binary tree, extract all the leaves in repeated succession into a list of lists by starting at the bottom and working your way upwards.

Reverse String

Write a program to reverse the given string.

Find Peak Element

Given a two-dimensional binary matrix where 1 represents water and 0 represents land, mutate the matrix in place and return the matrix with the highest peak maximized.

Build a Max Heap From an Array

Given an array of integers, transform the array in-place to a max heap.

Reverse Integer

Given a 32-bit signed integer, reverse digits of the integer.