Find first non-repeating character of given string

To find the first non-repeating character in a string, you can use different approaches. A naive solution involves two nested loops, checking each character's frequency. A more efficient method uses a frequency array with two traversals of the string. Alternatively, a single traversal can be used by storing character indices and marking repeats. If no non-repeating character is found, return '$'. These methods ensure optimal performance for the problem.

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