Missing Number | CSES problem set | All approaches explained and C++ code

[@sakumieika]

I didn't get the last one well, but I guess I'll rewatch it later. Thank you so much!!

[@maxishlymax6802]

thanks bro

[@saithunga152]

Really well explained!

[@sumitrawat6923]

Seriously!! worst explaination ever;

[@gnanaprakashm843]

So we have to sort the array to apply this approach

[@sakumieika]

for the one with the formula, how can I adjust it so that fractions aren't a problem?

[@الجواكر-خ3ي]

i think BS soltuion consider the array to be sorted.
and one mistake in the code is, you should read the input to n-1 not n.
am i correct ?