Increasing Array

import sys

if __name__ == '__main__':
    input()
    values = sys.stdin.readline().split()

    total = 0
    last_element = 0
    for value in values:
        value = int(value)
        if (last_element > value):
            total += (last_element - value)
        else:
            last_element = value
    print(total)

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