sasamba_bitches's blog

AtCoder D — Sequence Query
By sasamba_bitches, history, 21 month(s) ago, In English

I have already seen editorial, but getting WA. Here is the problem and this is my code. Can you please help me?

Thanks!

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21 month(s) ago, # |
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In the function "thir" you can't write

auto it = s.lower_bound(x);
it--;

because maybe it == s.begin(). Instead of "it--" you can do "k--".

Also you should check that it != s.end(), before you do "it++" in the for loop.

And since the for loop might not be entered, you should also check that it != s.end() before you return *it in the end.

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    21 month(s) ago, # ^ |
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    It did not help.

    code

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      21 month(s) ago, # ^ |
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      Check if "it == s.end()" before you increase it.

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