Conept behind out of iit

#1

at time strap 3.43
here sir do size of arr/size of int
i didnt understand the concept behind it

#2

You can fin the length of an int array using sizeof(array)/sizeof(int)
sizeof(array) will be the total size of array meaning total size of all the elements present in it.
size(int) can be considered as the size of one element of the array.
Clearly, by math…you you divide the first by second…you will get the number of elements.

#3

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#4

i didnot understand how he comparator function is woring even we did in lb -coins -1