prrateekk's blog

help in Asia-amritapuri ACM ICPC regionals problem
By prrateekk, history, 7 years ago, In English

how are we supposed to solve this problem?

https://www.codechef.com/AMR16MOS/problems/AMR16J

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7 years ago, # |
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Each balanced parenthesis sequence can be reduced to an equivalent nim piles using the following rules. Let *A denote the nim value of balanced sequence A. *() = 1 *(A) = *A + 1 *AB = *A ^ *B So just find the nim value of the given sequence. If it is 0, then it is a losing position for the first player, else winning. :)

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