I want to understand the last part of this video

#1

this one!

for(int i=0;i<n;i++)
{
largest = max(largest, arr[i]);
smallest = min(smallest, arr[i]);
}

#2

@deepanshuchoudhary
max(largest, arr[i]); max returns maximum of the two arguments provided, so this will return the max from largest and arr[i], ie the current element. This answer is assigned to largest. While iterating through all the elements of the array, you are assiging the larger element to largest, eventually you will end up with the largest element from the whole array.
Similarly, the min() function will return the smaller element.

#3

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