Myself is choose by first of several people t=1 dish (a> 0) + (b> 0) + (c> Choose 1, 0), then t for a dish, but the back is in trouble, how to classify, sometimes meet number two courses at the end of the first, sometimes not

CodePudding user response:

Or in other words, when there are n, to meet the conditions, how to write

CodePudding user response:

I think playing table better to do it, he is limited, this situation can come out a permutation and combination