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@Xion Xion/gist:1804474
Created Feb 11, 2012

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What would you like to do?
A neat little numerical puzzle
This puzzle is (allegedly) solved by elementary school children in 5 to 10 minutes,
but adults usually struggle with it much longer.
8809=6
7111=0
2172=0
6666=4
1111=0
3213=0
7662=2
9313=1
0000=4
2222=0
3333=0
5555=0
8193=3
8096=5
7777=0
9999=4
7756=1
6855=3
9881=5
5531=0
2581=?
(Bonus: Write a program that computes this function)
(Hint #1: It's language-agnostic. Actual numbers matter, not their names.)
(Hint #2: The program would take like 3-4 lines tops in most languages.)
(Hint #3: The function does not have well-defined value for certain class of inputs.)
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