Mono stack

A = [51, 49, 45, 30, 35, 50, 45, 46, 41, 49, 60]
stack = []
n = len(A)
ans = 0
for i in range(n):
    while stack and A[stack[-1]] < A[i]:
        ans = max(ans, i - stack.pop())
    stack.append(i)
print(ans)