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This type of diagnostic error (the one in your submission) usually happens in my case whenever I try to access a non-allocated memory space (like trying to access an element not in an array), I can see a lower_bound in your code, have you checked for it's edge cases, like when it throws last?
PS — I am only a noob so take this with a grain of salt
Seems fine to me....have used the same thing many times.....but am not much of an expert myself.....
You do binary search on a not sorted array.
Thanks......I just assumed that input was ordered.....
Still getting WA for this, would really appreciate if someone could point out what is wrong?