Kertoma

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

public class C {
    public static void main(String[] args) throws FileNotFoundException {
        Scanner scanner = new Scanner(new File("maarat.txt"));
        String[] numerotString = scanner.nextLine().split(" ");
        int[] numerot = new int[10];
        int yhteensa = 0;

        for (int i = 0; i < 10; i++) {
            numerot[i] = Integer.parseInt(numerotString[i]);
            yhteensa += numerot[i];
        }

        if (yhteensa <= 6) {
            System.out.print(pienempiKuin10(numerot));
            return;
        }

        int jaljella = numerot[0];
        int[] maarat = new int[8];
        int kerroin = 97656; // * 5n+1  8 kertaa,
        for (int i = 0; i < 8; i++) {
            int maara = (int) (jaljella / (double) kerroin);

            jaljella -= maara;
            maarat[7 - i] = maara;

            kerroin -= 1;
            kerroin *= 0.2;
        }

        int bitteja = BigInteger.TEN.pow(yhteensa).bitLength();

        int max = maarat[0] * 5; // Jos kaikki nollat olisivat luvun lopussa, tämä luku olisi

        int min = 10;
        int perus = (int) ((min + max) * 0.5f);
        BigInteger edellinenPienempi = kertoma(new BigInteger(min + ""));
        int edellinenPienempiLuku = min - 1;
        while (true) {
            BigInteger kertoma = kertoma(new BigInteger(perus + ""), new BigInteger(edellinenPienempiLuku + 1 + "")).multiply(edellinenPienempi);
            int pituus = kertoma.bitLength();

            int ero = pituus - bitteja;
            if (ero >= 0 && ero <= 4) {
                int len = kertoma.toString().length();
                // System.out.println("kertoma: " + perus + ", pituus: " + len + ", oikea: " + yhteensa);
                if (len - 1 == yhteensa) {
                    System.out.print(perus);
                    return;
                }
            }

            if (ero > 0) {
                if (max == perus) break;
                max = perus;
            } else {
                if (min == perus) break;
                min = perus;
                edellinenPienempi = kertoma;
                edellinenPienempiLuku = perus;
            }
            perus = min + (max - min) / 2;
        }


    }

    public static BigInteger kertoma(BigInteger luku) {
        if (luku.compareTo(BigInteger.ONE) == 0) {
            return luku;
        }

        return kertoma(luku.subtract(BigInteger.ONE)).multiply(luku);
    }

    public static BigInteger kertoma(BigInteger luku, BigInteger asti) {
        if (luku.compareTo(asti) == 0) {
            return luku;
        }

        return kertoma(luku.subtract(BigInteger.ONE), asti).multiply(luku);
    }

    public static int pienempiKuin10(int[] numerot) {
        if (numerot[2] == 1) { // 2 4 5 6 8 9

            if (numerot[0] == 1) { // 5 6 9
                if (numerot[1] == 1)
                    return 5;
                if (numerot[7] == 1)
                    return 6;
                return 9;
            } else { // 2 4 8
                if (numerot[4] == 0)
                    return 2;
                if (numerot[0] == 0)
                    return 4;
                return 8;
            }

        } else { // 1 3 7
            if (numerot[1] == 1)
                return 1;
            if (numerot[6] == 1)
                return 3;
            return 7;
        }
    }
}

Test 1

Group: 1, 2, 3

Verdict: RUNTIME ERROR

Exception in thread "main" java.io.FileNotFoundException: maarat.txt (No such file or dire...

Test 2

Group: 1, 2, 3

Verdict: RUNTIME ERROR

Exception in thread "main" java.io.FileNotFoundException: maarat.txt (No such file or dire...

Test 3

Group: 1, 2, 3

Verdict: RUNTIME ERROR

Exception in thread "main" java.io.FileNotFoundException: maarat.txt (No such file or dire...

Test 4

Group: 1, 2, 3

Verdict: RUNTIME ERROR

Exception in thread "main" java.io.FileNotFoundException: maarat.txt (No such file or dire...

Test 5

Group: 1, 2, 3

Verdict: RUNTIME ERROR

Exception in thread "main" java.io.FileNotFoundException: maarat.txt (No such file or dire...

Test 6

Group: 1, 2, 3

Verdict: RUNTIME ERROR

Exception in thread "main" java.io.FileNotFoundException: maarat.txt (No such file or dire...

Test 7

Group: 2, 3

Verdict: RUNTIME ERROR

Exception in thread "main" java.io.FileNotFoundException: maarat.txt (No such file or dire...

Test 8

Group: 2, 3

Verdict: RUNTIME ERROR

Exception in thread "main" java.io.FileNotFoundException: maarat.txt (No such file or dire...

Test 9

Group: 2, 3

Verdict: RUNTIME ERROR

Exception in thread "main" java.io.FileNotFoundException: maarat.txt (No such file or dire...

Test 10

Group: 2, 3

Verdict: RUNTIME ERROR

Exception in thread "main" java.io.FileNotFoundException: maarat.txt (No such file or dire...

Test 11

Group: 3

Verdict: RUNTIME ERROR

Exception in thread "main" java.io.FileNotFoundException: maarat.txt (No such file or dire...

Test 12

Group: 3

Verdict: RUNTIME ERROR

Exception in thread "main" java.io.FileNotFoundException: maarat.txt (No such file or dire...

Test 13

Group: 3

Verdict: RUNTIME ERROR

Exception in thread "main" java.io.FileNotFoundException: maarat.txt (No such file or dire...

Test 14

Group: 3

Verdict: RUNTIME ERROR

Exception in thread "main" java.io.FileNotFoundException: maarat.txt (No such file or dire...

Test 15

Group: 3

Verdict: RUNTIME ERROR

Exception in thread "main" java.io.FileNotFoundException: maarat.txt (No such file or dire...

Test 16

Group: 3

Verdict: RUNTIME ERROR

Exception in thread "main" java.io.FileNotFoundException: maarat.txt (No such file or dire...