Increasing Array

input()
nums = [int(r) for r in input().split()]

ans = 0
for i, n in enumerate(nums[1:], 1):
   if nums[i - 1] > n:
       ans += nums[i - 1] - n
       nums[i] = nums[i - 1]


print(ans)

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