WebIn this video I solve LeetCode problem 387 (First Unique Character in a String) with the JavaScript programming language. This question has previously appear... WebAug 9, 2024 · Given a string s, find the first non-repeating character in it and return its index.If it does not exist, return -1.(Full Question). We will keep track of the count of each character occurrence in string; There are 256 unique ascii characters and we can keep a count array to accommodate count of these 256 characters in the string
Missing Test Case - 387. First Unique Character in a String …
WebFor the first subtask, every character except ‘e’ occurs 2 times so we print the index of e that is 10. For the second subtask, the characters ‘o’ , ‘t’ , ‘e’ , ‘i’ and ‘q’ are unique but ‘o’ occurs before all the other unique characters . For the third subtask, all the characters are not unique so we return -1. WebApr 7, 2024 · Problems Given a string s, find the first non-repeating character in it and return its index. If it does not exist, return -1. Solution遍历,数组统计记录出现次数。如果数组未记录过,则将其index添加进列表中保存。 遍历列表,如果数组统计结果为1,则返回对 … free fundations printable cards
First Unique Character in a String - Startegy 1
WebThis tutorial will show various approaches to finding the first unique character in a given string. For instance, the result should be "n" if the given string is "stringstutorial," and "S" if the given string is "StringsTutorial". Explanation. Input: "stringstutorial" Explanation: Step 1: Creating a frequency list of the characters for the ... WebMay 19, 2024 · Given a string, find the first non-repeating character in it and return it's index. If it doesn't exist, return -1. Examples: s = "leetcode" return 0. s = "loveleetcode", return 2. Note: You may assume the string contain only lowercase letters. My solution WebConsider three arrays. One stores unique chars, the other stores the frequency of the chars, and the last one stores the first appearances. Count the frequency of each char in the string and put into the frequency array. Update first appearance array if the char is seen for the first time. Scan the char array and return the first char with ... bls online renewal for healthcare provider