Given two strings and , return if is a subsequence of , or otherwise.
A subsequence of a string is a new string that is formed from the original string by deleting some (can be none) of the characters without disturbing the relative positions of the remaining characters. (i.e., is a subsequence of while is not).
You are given two strings and .
String is generated by random shuffling string and then add one more letter at a random position.
387.First Unique Character in a String
Given a string , find the first non-repeating character in it and return its index. If it does not exist, return .
Example 1:
Given two strings and , return if can be constructed by using the letters from and otherwise.
Each letter in can only be used once in .
374.Guess Number Higher or Lower
We are playing the Guess Game. The game is as follows:
I pick a number from to . You have to guess which number I picked.
Given a positive integer , return if is a perfect square or otherwise.
A perfect square is an integer that is the square of an integer. In other words, it is the product of some integer with itself.
350.Intersection of Two Arrays II
Given two integer arrays and , return an array of their intersection. Each element in the result must appear as many times as it shows in both arrays and you may return the result in any order.
Example 1:
349.Intersection of Two Arrays
Given two integer arrays and , return an array of their intersection. Each element in the result must be unique and you may return the result in any order.
Example 1:
345.Reverse Vowels of a String
Given a string , reverse only all the vowels in the string and return it.
The vowels are , , , , and , and they can appear in both lower and upper cases, more than once.
Write a function that reverses a string. The input string is given as an array of characters .
You must do this by modifying the input array in-place with extra memory.