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mf wrote:You should check whether all these conditions hold: s >= d, (s + d) even, (s - d) even. Even either fails, the answer is "impossible."

Many thanks for your help. I forgot to check the even conditions.

./noddy

Hello all,

I'm having a bit of a trouble with problem 10812: Beat the Spread!
Although the problem seems more than easy: x+y = s, x-y = d => ... => x = (s+d)/2 and y = (s-d)/2, finally check if both x and y a are non negative.

The problem is that I keep getting WA and I cannot figure why. Any ...