def solution(prices):
answer = [0] * len(prices)
for i in range(len(prices)-1):
for j in range(i+1, len(prices)):
answer[i] += 1
if prices[i] > prices[j]:
break
return answer
배열의 덧셈과 곱셈
a = [0]
a + [0] = [ 0, 0 ]
a * 3 = [ 0, 0, 0 ]