int arr[70] // to call an array

Largest element in array

1. sorting → largest will be last →nlogn
2. largest = num type running the looop

second largest element

1. sorting→ then check emelent other then last one

   

2. find largest, and then start a loop check all thing .

3. optimal: go in a single loop, check if the current is bigger, then put current bigger in the second largest

check if array is sorted

1. check like this, that no previous is bigger

   

remove duplicate in plan

1. use set and itrate