Increasing Array

n = int(input())
value = input()
arr = value.split()
counter = 0
arr[0] = int(arr[0])
for i in range(n-1):
  arr[i+1] = int(arr[i+1])
  if arr[i] > arr[i+1]:
    diff = arr[i] - arr[i+1]
    arr[i+1] = arr[i+1]
    arr[i+1] +=diff
    counter+= diff
print(counter)

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED