Count Elements Greater Than Previous Average

sum과 avg을 int형으로만 생각해서 엣지케이스 통과 못했었음.
제약사항으로 준 내용은 방어코드로 코드 안짜도 됨. 이미 반영.
HackerRank가 좋은게 코드에만 집중하면 된다.
평균값과 현재값을 비교해야 함. (= 문제 이해)

import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.function.*;
import java.util.regex.*;
import java.util.stream.*;
import static java.util.stream.Collectors.joining;
import static java.util.stream.Collectors.toList;


class Result {

    /*
     * Complete the 'countResponseTimeRegressions' function below.
     *
     * The function is expected to return an INTEGER.
     * The function accepts INTEGER_ARRAY responseTimes as parameter.
     */

    public static int countResponseTimeRegressions(List<Integer> responseTimes) {    
        int resultCnt = 0;
        long sum = 0L;
        double avg = 0.0;
        int resSize = responseTimes.size();
            for(int i=0; i < resSize; i++){                
                if(i != 0){
                    sum += responseTimes.get(i-1);
                    avg = (double)sum / i;                
                    if(responseTimes.get(i) > avg) {
                        resultCnt++;
                    }  
                }                         
            }
        
        return resultCnt;
    }

}

public class Solution {
    public static void main(String[] args) throws IOException {
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));

        int responseTimesCount = Integer.parseInt(bufferedReader.readLine().trim());

        List<Integer> responseTimes = IntStream.range(0, responseTimesCount).mapToObj(i -> {
            try {
                return bufferedReader.readLine().replaceAll("\\s+$", "");
            } catch (IOException ex) {
                throw new RuntimeException(ex);
            }
        })
            .map(String::trim)
            .map(Integer::parseInt)
            .collect(toList());

        int result = Result.countResponseTimeRegressions(responseTimes);

        System.out.println(result);

        bufferedReader.close();
    }
}

문제 : https://www.hackerrank.com/contests/software-engineer-prep-kit/challenges/count-elements-greater-than-previous-average/problem