Compute the Combination

Limits: 2s, 512 MB

Let P = C(N,0) - C(N,1) + C(N,2) - C(N,3) + … + C(N,N); where C(n,r) is “n choose r”.

This is a companion discussion topic for the original entry at
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for i in range(test):
i have tried solving this problem using the above algorithm, which obviously yields the correct answer for test case 1, but it says 'CPU LIMIT EXCEEDED ’ for the second test case. How is it possible?

This problem’s judge-dataset is huge. So this problem can not be solved using Python, within the time limit. :cold_sweat:

Although your approach is incorrect.

I used a different algorithm before, but even that got the same response. Anyway Thanks bro