# Min Cost Climbing Stairs

Difficulty: Easy Link: Day 8: June Leetcode Challenge Problem Statement You are given an integer array cost where cost[i] is the cost of ith step on a staircase. Once you pay…

# 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…

# To Lower Case (Leetcode 709)

Difficulty: Easy Link: Day 24: May Leetcode Challenge Problem Description Given a string s, return the string after replacing every uppercase letter with the same lowercase letter.…

# Find and Replace Pattern (Leetcode 890)

Difficulty: Medium Link: Day 21: May Leetcode Challenge Problem Description Given a list of strings words and a string pattern, return a list of words[i] that match pattern. You may return the…

# 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…

# 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…

# 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…

# Count Binary Substrings

Difficulty : Easy Link: Leetcode April Challenge 2021: Day 23 Problem Description Give a string s, count the number of non-empty (contiguous) substrings that have the…