Could you provide an example in your problem statement? Also, as Evan says below, you should have more than one test case or it becomes a trivial matter to hard-code a particular answer.
Probably should add a couple more test cases so that silly people like me don't submit answers like this. ;)
Which values occur exactly three times?
Reverse the Words (not letters) of a String
Number of toolboxes?
Area of a Square
Tell me the slope
Check if any duplicates in your data
chance in percent for minimum K heads when a good coin is tossed N times?
Angle of triangle
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