# Find Duplicate File in System (Leetcode 609)

Difficulty: Medium Link: Day 18: May Leetcode Challenge Problem Description Given a list paths of directory info, including the directory path, and all the files with contents…

# Longest String Chain (Leetcode 1048)

Difficulty: Medium Link: Day 17: May Leetcode Challenge Problem Description Given a list of words, each word consists of English lowercase letters. Let’s say word1 is a…

# 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…

# Flatten Binary Tree to Linked List (Leetcode 114)

Difficulty: Medium Link: Day 14: May Leetcode Challenge Problem Description Given the root of a binary tree, flatten the tree into a “linked list”: The “linked list”…

# Ambiguous Coordinates (Leetcode 816)

Difficulty: Medium Link: Day 13: May Leetcode Challenge Problem Description We had some 2-dimensional coordinates, like “(1, 3)” or “(2, 0.5)”.  Then, we removed all commas, decimal points, and…

# 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…

# Maximum Points You Can Obtain from Cards(Leetcode 1423)

Difficulty: Medium Link: Day 11 : May Leetcode Challenge Problem Statement There are several cards arranged in a row, and each card has an associated number…

# Count Primes

Difficulty: Easy Link: Day 2: May LeetCode Challenge Problem Description Count the number of prime numbers less than a non-negative number, n. Examples Constraints 0 <=…

# Delete Operation for Two Strings (Leetcode 583)

Problem Description Given two strings word1 and word2, return the minimum number of steps required to make word1 and word2 the same. In one step, you can delete exactly one character in either string. Examples Constraints…

# 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…