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Название |
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In the function "thir" you can't write
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.
It did not help.
code
Check if "it == s.end()" before you increase it.