There are nine coins, one slightly heavier than the rest. You have three old-fashioned balances like these that you can use to compare the weights of whichever sets of coins you would like. Exactly one of the balances provides arbitrary readings (neither necessarily…

There are eight coins, one of which weighs a slightly different amount from the rest. You have an old-fashioned balance like this one that you can use to compare the weights of whichever sets of coins you would like. Find the special coin in only three weighings. Bonus…

Ben P. decided to kick off an internal game of code golf , which we’re hoping will be the first of many. The objective is…