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优质回答There are several ways to approach this question, but one possible solution is to use a combination of a dictionary and a set.First, we can create a dictionary where the keys are the characters in the string and the values are the counts of each character. We can iterate through the string and update the counts in the dictionary accordingly.Next, we can create a set and iterate through the dictionary. For each key-value pair in the dictionary, if the value is greater than 1, we add the key to the set.Finally, we can convert the set to a list and return it as the result.Here"s an example implementation in Python:```pythondef find_duplicates(string): char_counts = {} for char in string: if char in char_counts: char_counts[char] += 1 else: char_counts[char] = 1 duplicates = set() for char, count in char_counts.items(): if count > 1: duplicates.add(char) return list(duplicates)```Example usage:```pythonstring = "hello world"print(find_duplicates(string)) # Output: ["l", "o"]```In this example, the characters "l" and "o" appear more than once in the string, so they are returned as duplicates.