# Evaluate Reverse Polish Notation (Leetcode 150)

Difficulty: Medium Link: Day 25: May Leetcode Challenge Problem Description Evaluate the value of an arithmetic expression in Reverse Polish Notation. Valid operators are +, -, *, and /. Each…

# Binary Tree Level Order Traversal (Leetcode 102)

Difficulty : Medium Link: Day 12: May Leetcode Challenge Problem Description Given the root of a binary tree, return the level order traversal of its nodes’ values. (i.e.,…

# Valid Number (Leetcode 65)

Difficulty: Hard Link : Day 15: May Leetcode Challenge Asked in : Facebook, Linkedin, Twitch Problem Description A valid number can be split up into these components…

# Range Sum Query 2D – Immutable (Leetcode 304)

Difficulty: Medium Link: Day 12: May Leetcode Challenge Problem Description Given a 2D matrix matrix, handle multiple queries of the following type: Calculate the sum of the elements…

# Convert Sorted List to Binary Search Tree (Leetcode 109)

Difficulty: Medium. Link: Day 6: May Leetcode Challenge Problem Description Given the head of a singly linked list where elements are sorted in ascending order, convert it to…

# Jump Game II (Leetcode 45)

Difficulty: Medium Link : Day 5: May Leetcode Challenge Problem Description Given an array of non-negative integers nums, you are initially positioned at the first index…

# Non-decreasing Array (Leetcode 665)

Difficulty: Medium Link: Day 4 : May Leetcode Challenge Problem Description Given an array nums with n integers, your task is to check if it could become non-decreasing by…

# Flatten Nested List Iterator (Leetcode 341)

Difficulty : Medium Link : April Leetcoding Day 13 Problem Description You are given a nested list of integers nestedList. Each element is either an integer…

# Beautiful Arrangement II (Leetcode 667)

Difficulty : Medium Link : April Leetcoding Challenge 2021: Day 12 Problem Statement Given two integers n and k, you need to construct a list which contains n different positive…

# Letter Combinations of a Phone Number (Leetcode 17)

Letter combinations of a phone number