Increasing Array

def solve(nums):
    res = 0
    curr_num = nums[0]
    for num in nums[1:]:
        if num < curr_num:
           res += (curr_num - num)
        elif num > curr_num:
            curr_num = num
    print(res)

n = int(input())
nums = [int(x) for x in input().split()]
solve(nums)

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