arrays ex

1.задача
import java.util.Scanner;

public class main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int l = Integer.parseInt(scan.nextLine());
        letters(l);
    }

    public static void letters(int l) {
        char[] letter = "abcdefghijklmnopqrstuvwxyz".toCharArray();
        for(int i =0;i < l; i++ ) {
            System.out.print(letter[i]+" ");
        }
    }
}
2.import java.util.Scanner;

public class main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int[] a = {2, 6, 4,8};
        int[] b = {2, 6, 4,8};
        boolean yes = true;
        if (a.length == b.length) {
            for (int i = 0; i < a.length; i++) {
                if (a[i] != b[i]) {
                    yes = false;
                    break;
                }
                if (a[i] == b[i]) {
                    yes = true;
                }
            }
        } else {
            yes = false;
        }
        if (yes == false){
            System.out.println("not equals");
        }
        else if (yes == true){
            System.out.println("equals");
        }
    }
}
3.задача
import java.util.Scanner;

public class main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        char[] a = "absav".toCharArray();
        char[] b = "absbb".toCharArray();
        if (a.length > b.length) {
            System.out.println("b is sooner in alphabet");
        }
        if (a.length < b.length) {
            System.out.println("a is sooner in alphabet");
        }
        if (a.length == b.length) {
            for (int i = 0; i < a.length; i++) {
                if (a[i]==(b[i])) {
                    continue;
                }
                if (a[i]!=b[i]) {
                    if (a[i] > b[i]) {
                        System.out.println("b is sooner in alphabet");
                    }if (a[i] < b[i]) {
                        System.out.println("a is sooner in alphabet");
                    }
                    break;
                }
            }
        }
    }
}
4.задача
import java.util.Scanner;
public class main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int[] arr = {2, 1, 1, 2, 3, 3, 2, 2, 2,2, 1,3,3,3,3,3};
        int best = 0;
        int preBest = 0;
        int element = 0;
        int preElement = 0;
        for (int i = 1; i < arr.length; i++) {
            if (arr[i] == arr[i - 1]) {
                best++;
                element = arr[i];
            } else if (arr[i] != arr[i - 1]) {
                preBest = best;
                preElement = element;
                best = 0;
                element = 0;
            }
        }
        if (best < preBest) {
            System.out.print("{");
            for (int s = 0; s < preBest ; s++) {
                System.out.print(preElement + ",");
            }
            System.out.print(preElement + "}");
        }else{
            System.out.print("{");
            for (int s = 0; s < best - 1; s++) {
                System.out.print(element + ",");
            }
            System.out.print(element + "}");
        }
    }
}