[프로그래머스] 시소 짝꿍 java 풀이(LEVEL2)

https://school.programmers.co.kr/learn/courses/30/lessons/152996

프로그래머스

나의풀이

import java.util.*;
class Solution {
    public long solution(int[] weights) {
        /*
        a<=b 일때
        a==b
        a*2=b*1
        a*3=b*2
        a*4=b*3        
        */
        long answer = 0;
        Arrays.sort(weights);
        int count=0;
        for(int i=0; i<weights.length-1; i++){
            if(i>0){
                if(weights[i] == weights[i-1]){
                    count--;
                    answer +=count;
                    continue;
                }
            }
            count = 0;
            for(int j=i+1; j<weights.length; j++){
                if(weights[i] == weights[j]||
                  weights[i]*4 == weights[j]*3||
                  weights[i]*3 == weights[j]*2||
                  weights[i]*2 == weights[j]
                  ){
                    count++;
                }
            }
            answer+=count;
        }
        
        return answer;
    }
}