Тест проходит.
package com.javarush.task.task18.task1822;
/*
Поиск данных внутри файла
*/
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
public class Solution {
public static void main(String[] args) throws IOException {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
FileInputStream inputStream = new FileInputStream(reader.readLine());
byte[] buffer = new byte[inputStream.available()];
inputStream.read(buffer);
inputStream.close();
reader.close();
String s = "";
for (byte i : buffer) s = s + (char)i;
//System.out.println(s);
String[] strings = s.split("\n");
for (String s1 : strings) {
if (Integer.parseInt(args[0]) == Integer.parseInt(s1.split(" ")[0])) System.out.println(s1);
}
}
}