hackslash_123's blog

By hackslash_123, history, 19 months ago, In English,

In yesterday's Educational round contest(link), my solution for problem C got failed on system testing, but the same solution got passed when I submitted again after the contest . Can anyone help me out ?

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19 months ago, # |
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You tried to reach negative array index when you are trying to get the sum. Change low to 1 and you will not encounter undefined behaviour. Sometimes even Undefined Behaviour could pass. It's a bit of random thing.