Säähavainnot

input/PekkaPouta.java:53: error: cannot find symbol
        Scanner scanner = new Scanner(Objects.requireNonNull(Datatahti.class.getResourceAsStream("/input.txt")));
                                                             ^
  symbol:   class Datatahti
  location: class PekkaPouta
1 error

import java.util.*;
import java.util.stream.Collectors;

public class PekkaPouta {
    @SuppressWarnings({"SpellCheckingInspection", "ForLoopReplaceableByForEach"})
    static class Paiva {
        double[] oikea = new double[12];
        double[] edellinenPaiva = new double[24];

        double[] arvaus = new double[12];

        double keskiarvo = 1;

        public Paiva() {
            Arrays.fill(arvaus, Double.NaN);
        }

        static class P {
            public P(int a, int b) {this.a = a;this.b = b;}
            int a,b;
        }
        boolean isTasainen(double maxEro) {
            double summa = 0;
            double maara = 0;
            for (int i = 0; i < edellinenPaiva.length; i++) {
                summa += edellinenPaiva[i];
                maara++;
            }
            double keskiarvo = summa / maara;
            this.keskiarvo = keskiarvo;
            for (int i = 0; i < edellinenPaiva.length; i++) {
                if (Math.abs(edellinenPaiva[i] - keskiarvo) > maxEro ) {
                    return false;
                }
            }
            return true;
        }
        P pisteet() {
            int a = 0;
            int b = 0;
            for (int i = 0; i < arvaus.length; i++) {
                double arv = arvaus[i];
                if (Double.isNaN(arv)) continue; //?
                double oik = oikea[i];
                if (Math.abs(arv - oik) < 0.75) a++;
                else b++;
            }
            return new P(a,b);
        }
    }
    @SuppressWarnings("UnusedReturnValue")
    int main() {
        Scanner scanner = new Scanner(Objects.requireNonNull(Datatahti.class.getResourceAsStream("/input.txt")));
        int n = Integer.parseInt(scanner.nextLine());
        ArrayList<Paiva> paivat = new ArrayList<>(n);
        for (int i = 0; i < n; i++) {
            String[] line = scanner.nextLine().split(" ");
            Paiva paiva = new Paiva();
            for (int j = 0; j < line.length; j++) {
                double d = Double.parseDouble(line[j]);
                if (j < 24) {
                    paiva.edellinenPaiva[j] = d;
                } else {
                    paiva.oikea[j-24] = d;
                }
            }
            paivat.add(paiva);
        }


        double maxEro = 1;
        List<Paiva> tasaiset = paivat.stream().filter(paiva -> paiva.isTasainen(maxEro)).collect(Collectors.toList());
        //System.out.println("Tasaisia " + tasaiset.size());

        for (Paiva paiva : tasaiset) {
            for (int i = 0; i < 12; i++) {
                paiva.arvaus[i] = paiva.keskiarvo;
            }
        }
        for (Paiva paiva : paivat) {
            paiva.arvaus[0] = paiva.edellinenPaiva[23];

            paiva.arvaus[1] = paiva.edellinenPaiva[23];
            paiva.arvaus[2] = paiva.edellinenPaiva[23];
        }
        int a = 0;
        int b = 0;

        int at = 0;
        int bt = 0;
        for (Paiva paiva : paivat) {
            Paiva.P pisteet = paiva.pisteet();
            a += pisteet.a;
            b += pisteet.b;

            if (paiva.isTasainen(maxEro)) {
                at += pisteet.a;
                bt += pisteet.b;
            }
        }
        //System.out.println(a + " " +  b + " " + n);
        //System.out.println(at + " " + bt);
        //System.out.println(a / (double)(b+a));
        //System.out.println((int)(25 * (a-b) / (double)n));

        StringBuilder builder = new StringBuilder();
        for (Paiva paiva : paivat) {
            for (double arvaus : paiva.arvaus) {
                if (Double.isNaN(arvaus)) builder.append("? ");
                else builder.append(arvaus).append(" ");
            }
            builder.append("\n");
        }
        System.out.println(builder);
        return 0;
    }
    public static void main(String[] args) {
        new PekkaPouta().main();
    }
}