Problem Find the nth digit of the infinite integer sequence 1, 2, 3, 4, 5, 6, 7, 8, 9, ...
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400. Nth Digit
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389. Find the Difference
Problem Given two strings s and t which consist of only lowercase letters.String t is g...
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387. First Unique Character in a String
Problem Given a string, find the first non-repeating character in it and return it's in...
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383. Ransom Note
Problem Given an arbitrary ransom note string and another string containing letters fro...
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374. Guess Number Higher or Lower
Problem We are playing the Guess Game. The game is as follows:I pick a number from 1 to...
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371. Sum of Two Integers
Problem Calculate the sum of two integers a and b, but you are not allowed to use the o...
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367. Valid Perfect SquareProblem Given a positive integer num, write a function which returns True if num is a p...
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350. Intersection of Two Arrays II
Problem Given two arrays, write a function to compute their intersection.Note: Each ele...
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349. Intersection of Two ArraysProblem Given two arrays, write a function to compute their intersection.Note: Each ele...
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345. Reverse Vowels of a StringProblem Write a function that takes a string as input and reverse only the vowels of a ...
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344. Reverse String
Problem Write a function that takes a string as input and returns the string reversed. ...
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342. Power of four
Problem Given an integer (signed 32 bits), write a function to check whether it is a po...
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326. Power of Three
Problem Given an integer, write a function to determine if it is a power of three.Follo...
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303. Range Sum Query - Immutable
Problem Given an integer array nums, find the sum of the elements between indices i and...
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292. Nim GameProblem You are playing the following Nim Game with your friend: There is a heap of sto...
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290. Word PatternProblem Given a pattern and a string str, find if str follows the same pattern.Here fol...
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278. First Bad VersionProblem You are a product manager and currently leading a team to develop a new product...
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268. Missing Number
Problem Given an array containing n distinct numbers taken from 0, 1, 2, ..., n, find t...
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263. Ugly NumberProblem Write a program to check whether a given number is an ugly number.Ugly numbers ...
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258. Add DigitsProblem Given a non-negative integer num, repeatedly add all its digits until the resul...