12345 - Dynamic len(set(a[L:R]))

All about problems in Volume 123. If there is a thread about your problem, please use it. If not, create one with its number in the subject.

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12345 - Dynamic len(set(a[L:R]))

Post by forthright48 » Wed Aug 21, 2013 3:03 pm

Brute force works, but what is the expected solution by the setter? People seem to have solved it in less than 1 second. I guess there is a faster approach?
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