yeah that's for out of bounds I know , and even when I added the condition if(idx<v.size()-1) then check for idx+1 , even in that case , the compiler picks 6 as lower bound and I really don't know how codeblocks and ideone.com are some how giving correct answers

I did add the if condition but still for some reason it picks the lower bound as 6 like what ?

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you can check the code mate there is no getchar and this thing has happened with me even before and now its way more tilting and irritating