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344. Reverse String Description Write a function that takes a string as input and returns the string reversed.Example: Given s = “hello”, return “olleh”. Solution class Solution { public String re

657. Judge Route Circle Description Initially, there is a Robot at position (0, 0). Given a sequence of its moves, judge if this robot makes a circle, which means it moves back to the original place.Th

541. Reverse String II Description Given a string and an integer k, you need to reverse the first k characters for every 2k characters counting from the start of the string. If there are less than k ch

345. Reverse Vowels of a StringWrite a function that takes a string as input and reverse only the vowels of a string.Example 1: Given s = “hello”, return “holle”.Example 2: Given s = “leetcode”, retu

67. Add BinaryGiven two binary strings, return their sum (also a binary string).For example, a = "11" b = "1" Return "100".class Solution { public String addBinary(String a, String b) {

557. Reverse Words in a String IIIGiven a string, you need to reverse the order of characters in each word within a sentence while still preserving whitespace and initial word order.Example 1:Input: "L

13. Roman to IntegerGiven a roman numeral, convert it to an integer.Input is guaranteed to be within the range from 1 to 3999.class Solution { public int romanToInt(String s) { char [

58. Length of Last WordGiven a string s consists of upper/lower-case alphabets and empty space characters ' ', return the length of last word in the string.If the last word does not exist, return 0.Not

434. Number of Segments in a StringCount the number of segments in a string, where a segment is defined to be a contiguous sequence of non-space characters.Please note that the string does not contain