Increasing Array

n = int(input())
inputs = [int(x) for x in (input()).split(" ")]

turns = 0

if n == 1:
    print(0)
else:
    for i in range(1, len(inputs)):
        diff = max(0, inputs[i - 1] - inputs[i])
        turns += diff
        inputs[i] += diff

    print(turns)

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