Non repeating character from a preset of characters

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write a program to find the least repeating character in a given string.

I would like to pick a random letter out of a list B, C, D at random order and would make sure that they do not repeat. I have tried this but it repeats the letters

public class Test {
    static Random r = new Random();    
    static char pickRandom(char... letters) {
        return letters[r.nextInt(letters.length)];
    }
    public static void main(String args[]) {
        for (int i = 0; i < 10; i++) {
            System.out.print(pickRandom('B', 'C', 'D'));
        }
    }
}

You should check, if character already taken, for example declare another one array which contains already taken character, so if character caontains in this array, try to select another character, OR you can simply use Collections.shuffle method(Collection knowledge required)

List<Character> solution = new ArrayList<>();
solution.add('a');
solution.add('Y');
solution.add('Z');
Collections.shuffle(solution);

Find the first non-repeating character from a stream of characters , Initialize all entries of inDLL[] as NULL and repeated[] as false. To get the first non​-repeating character, return character at head of DLL. Following are steps to  Finally, we loop through char_order until we find a character with a value of 1 in char_order and return it. Method 2: Using while loop s = "tutorialspointfordeveloper" while s != "": slen0 = len(s) ch = s[0] s = s.replace(ch, "") slen1 = len(s) if slen1 == slen0-1: print ("First non-repeating character is: ",ch) break; else: print ("No Unique Character Found!")

This will keep track of the last character that was generated. The program will keep generating a new character until the one being generated is not the same as the last.

char last = 0, next = 0;
for (int i = 0; i < 10; i++) {
    do {
        last = next;
        next = pickRandom('B', 'C', 'D');
    } while (next == last);
    System.out.print(next);
}

Given a string, find its first non-repeating character, Approach: A character is said to be non-repeating if its frequency in the string is unit. Now for finding such characters, one needs to find the frequency of all  Input : str = geeksforgeeks, k = 3 Output : r First non-repeating character is f, second is o and third is r. Input : str = geeksforgeeks, k = 2 Output : o Input : str = geeksforgeeks, k = 4 Output : Less than k non-repeating characters in input.

You can do it as follows:

import java.util.Random;

public class Main {
    static Random r = new Random();
    static int lastRandom;
    static char pickRandom(char... letters) {
        int newRandom=r.nextInt(letters.length);
        while(newRandom==lastRandom)
            newRandom=r.nextInt(letters.length);
        lastRandom=newRandom;
        return letters[newRandom];
    }

    public static void main(String args[]) {
        for (int i = 0; i < 10; i++) {
            System.out.print(pickRandom('B', 'C', 'D'));
        }
    }
}

Sample output:

CDCBDBDCDC

First non repeating character in a stream, First non-repeating character in a stream of characters: Problem Description Given a string A denoting a stream of lowercase alphabets. You have to make new  To get the first non-repeating character, return character at head of DLL. Following are steps to process a new character ‘x’ in a stream. If repeated [x] is true, ignore this character (x is already repeated two or more times in the stream) If repeated [x] is false and inDLL [x] is NULL (x is seen first time).

First non-repeating character in a stream of characters, Note 3: Examples of characters are the accuracy control character, optical character, print control character, repeating character, shiftin character, shift-out string. character check: In error detection systems, a check in which (a) preset rules are used for the formation of characters and (b) characters that are not formed in  First non-repeating character using one traversal of string | Set 2 Given a string, find the first non-repeating character in it. For example, if the input string is “GeeksforGeeks”, then output should be ‘f’ and if input string is “GeeksQuiz”, then output should be ‘G’.

Fiber Optics Standard Dictionary, Note 1: In most communications systems, characters are represented as strings, i.e., character, null character, print control character, repeating character, shift-​in character, a check in which (a) preset rules are used for the formation of characters, and (b) characters that are not formed in accordance with the rules are  Get the index of the first non-repeating character by calling function findFirstNonRepeatedChar. It returns the index of the character and -1 if no element is found. 4. Print the character if found. 5. structure element consists of two integers count and index to store the total count and index of a character.

Communications Standard Dictionary, 32 The DATA Declaration It is frequently useful to be able to preset or initialize 93x10 - 0 , INT with 49 , FIRST with the characters " JOHN " , LAST with the type may be preset with character information in the form of literal constants having no more than four characters . The pattern of slashes can be repeated , in which. This solution works on the fact that If the first index of the character is also the last index of that character then it means this character is not repeating – Anirudh Sharma Oct 9 '19 at 14:25 This is definitely not O (n), especially since you read the string once for each character. So we're still in O (n²) with this solution.