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Write a program that reads in a string and prints the character once it has been found to have duplicates (2 or more). The program should only print the character once, not every time a duplicate is found. The program should be faster than O(n^2).
Feb 28, 2013

Write a program that reads in a string and prints the character once it has been found to have duplicates (2 or more). The program should only print the character once, not every time a duplicate is found. The program should be faster than O(n^2).

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