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Discussion of Problem
1247
. Check a Sequence
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nice task. There's a hint for those who want it.
jk_qq
23 Mar 2014 08:26
substract one from every element of sequence and search for prefix or suffix (I mean subsequence A_0, A_1, ..., A_j or A_k, A_{k+1}, ..., A_s) with negative sum.
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