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in problem E where there is equation for b2-b1 we should substract (n-1)*a2 instead of n*a2
On Ulissao → Finally Green, 2 years ago
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Solve problems
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Gratz
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0 is a special case. When you have more than (n+1)/2 zeros then MEX != 0; If 0 isn't MEX we look at other numbers from 1 to n. If n-number_of_zeros_in_our_array>=1 it means that this number is MEX, because you can just make an array like that: {actual_number,x,x,x,0,0,0}. Zeros are ignored so we put them at the end to not damage our result. x- are all numbers excluding zeros.

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Could D be solved this way but counting decreasing values instead of increasing?
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you could just copy pi digits from the sample input xD