[32일차][프로그래머스][131705]삼총사

def solution(number):
    count = 0
    number_len = len(number)
    
    for idx1 in range(number_len):
        for idx2 in range(idx1+1, number_len):
            for idx3 in range(idx2+1, number_len):
                if number[idx1] + number[idx2] + number[idx3] == 0:
                    count += 1
    
    return count