100 Easy | Tech Notebook

📄️ Two Sum

Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target.

Given an integer x, return true if x is a palindrome, and false otherwise.

Convert the given roman numeral string into integer

Given a non-negative integer x, return the square root of x rounded down to the nearest integer. The returned integer should be non-negative as well.

Write a function to find the longest common prefix string amongst an array of strings.

Given a string s containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.

You are given the heads of two sorted linked lists list1 and list2.

Given two binary strings a and b, return their sum as a binary string.

Given the head of a sorted linked list, delete all duplicates such that each element appears only once. Return the linked list sorted as well.

Given the root of a binary tree, return its maximum depth.

Given an array of integers nums, calculate the pivot index of this array.

You are given an integer array nums consisting of n elements, and an integer k.

Given an integer array nums, move all 0's to the end of it while maintaining the relative order of the non-zero elements.

For two strings s and t, we say "t divides s" if and only if s = t + ... + t (i.e., t is concatenated with itself one or more times).

You have a long flowerbed in which some of the plots are planted, and some are not. However, flowers cannot be planted in adjacent plots.

Given a string s, reverse only all the vowels in the string and return it.

You are given an array prices where prices[i] is the price of a given stock on the ith day.