Which silly thing you missed in your code that costed more than 3hrs to figure out later? What is your precaution not to do the similar mistakes again?
I recently copied a code from stackoverflow for calculating gcd. I failed to recognize that function failed for -ve numbers. Eventually wasted good time to figure it out. (Precaution) Later I realized never to copy code which does not defines contract. Please share your mistake and precaution and help saving other's time too. :-)
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