aoc2021day01

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;

public class Solution01A {
  public static void main(String[] args) {
    try {
      File myObj = new File(args[0]);
      Scanner myReader = new Scanner(myObj);
      int count = 0;
      int prev = Integer.valueOf(myReader.nextLine());
      while (myReader.hasNextLine()) {
        int curr = Integer.valueOf(myReader.nextLine());
        if (curr > prev) count++;
        prev = curr;
      }
      myReader.close();
      System.out.println(count);
    } catch (FileNotFoundException e) {
      System.out.println("An error occurred.");
      e.printStackTrace();
    }
  }
}

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;

public class Solution01B {
  public static final int SIZE = 3;
  public static void main(String[] args) {
    try {
      File myObj = new File(args[0]);
      Scanner myReader = new Scanner(myObj);
      int count = 0;
      int[] ring = new int[SIZE];
      int index = 0;
      int sum = 0;
      while (myReader.hasNextLine() && index < SIZE) {
        ring[index] = Integer.valueOf(myReader.nextLine());
        sum += ring[index];
        index++;
      }
      index = 0;
      while (myReader.hasNextLine()) {
        int curr_num = Integer.valueOf(myReader.nextLine());
        int curr_sum = sum - ring[index] + curr_num;
        if (curr_sum > sum) count++;
        sum = curr_sum;
        ring[index] = curr_num;
        index = (index + 1) % SIZE;
      }
      myReader.close();
      System.out.println(count);
    } catch (FileNotFoundException e) {
      System.out.println("An error occurred.");
      e.printStackTrace();
    }
  }
}