프로그래머스 - 시소 짝꿍 (L2)

 1def solution(weights):
 2    answer = 0
 3    wdict = {}
 4    
 5    weights.sort(reverse=True)
 6    for i in weights:
 7        if i in wdict:
 8            answer += wdict[i]
 9        if i*3/2 in wdict:
10            answer += wdict[i*3/2]
11        if i*2 in wdict:
12            answer += wdict[i*2]
13        if i*4/3 in wdict:
14            answer += wdict[i*4/3]
15        
16        wdict[i] = wdict[i]+1 if i in wdict else 1
17    return answer