First Non-repeating Character

Hard Queue: Advanced Types PRO

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Problem Statement

Write a C program to find the first non-repeating character in a stream of characters using a queue and frequency map.

Input Format

A string stream of characters.

Output Format

Print the sequence of first non-repeating characters as each character is processed (separated by spaces, or # if none).

Constraints

1 <= string length <= 100

Sample Input

aabccxb

Sample Output

a a # b b b x

Explanation

Track character frequencies and use a queue to store characters in order of appearance. Discard repeating elements from front.

Starter Code

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main() {
    char str[100];
    if (scanf("%s", str) == 1) {
        // Write your code here to find first non-repeating character using queue
    }
    return 0;
}

Limits

Time Limit: 1s
Memory Limit: 256MB

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