8.1

ЛИЦЕ НА ТРИЪГЪЛНИК В РАВНИНА
import java.util.Scanner;

public class main {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int x1 = Integer.parseInt(scan.nextLine());
        int y1 = Integer.parseInt(scan.nextLine());
        int x2 = Integer.parseInt(scan.nextLine());
        int y2 = Integer.parseInt(scan.nextLine());
        int x3 = Integer.parseInt(scan.nextLine());
        int y3=y2;
        int a = Math.abs(x2-x3);
        int h = Math.abs(y2-y1);
        double S = (double)a*h/2;
        System.out.println(S);
    }
}
ПРЕНАСЯНЕ НА ТУХЛИ
import java.util.Scanner;

public class main {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int bricks = Integer.parseInt(scan.nextLine());
        int workers = Integer.parseInt(scan.nextLine());
        int comp = Integer.parseInt(scan.nextLine());
        int bricksPerWorker= bricks/workers;
        double courses = Math.ceil((double)bricksPerWorker/comp);
        if(courses == 0) {
            courses = 1;
        }
        System.out.printf("%.0f",courses);
    }
}

ТОЧКА ОТ ОТСЕЧКА
import java.util.Scanner;

public class main {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int first = Integer.parseInt(scan.nextLine());
        int second = Integer.parseInt(scan.nextLine());
        int point = Integer.parseInt(scan.nextLine());
        int closest = Math.min(Math.abs(first - point),Math.abs(second - point));
        if(point<=first && point>=second) {
            System.out.println("in");
        }else {
            System.out.println("out");
        }
        System.out.println(closest);
    }
}

ТОЧКА ВЪВ ФИГУРА
import java.util.Scanner;

public class main {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int x = Integer.parseInt(scan.nextLine());
        int y = Integer.parseInt(scan.nextLine());
        if((x>=4 && x<=10 && y>=-5 && y<=3) || (x>= 2 && x<= 12 && y>=-3 && y<=1)) {
            System.out.println("in");
        }else {
            System.out.println("out");
        }
    }
}
ДАТА СЛЕД 5 ДНИ
import java.util.Scanner;

public class main {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int d = Integer.parseInt(scan.nextLine());
        int m = Integer.parseInt(scan.nextLine());
        int dayInMounts = 31;
        d+=5;
        if(m==4 || m==6 || m==9 || m==11) {
            dayInMounts = 30;
        }
        if(m==2) {
            dayInMounts = 28;
        }

        if(d>=dayInMounts) {
            d = d - dayInMounts;
            m+=1;
        }
        if(m>=12) {
            m=1;
        }


        System.out.printf("%d.%02d",d,m);
    }
}
СУМА ОТ ТРИ ЧИСЛА
import java.util.Scanner;

public class main {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int a = Integer.parseInt(scan.nextLine());
        int b = Integer.parseInt(scan.nextLine());
        int c = Integer.parseInt(scan.nextLine());
        if (a + b == c) {
            if (a < b) {
                System.out.printf("%d + %d = %d", a, b, c);
            }if(a>b) {
                System.out.printf("%d + %d = %d", b, a, c);
            }
        }
        else if (a + c == b) {
            if (a < c) {
                System.out.printf("%d + %d = %d", a, c, b);
            }if(a>c) {
                System.out.printf("%d + %d = %d", c, a, b);
            }
        }
        else if (b + c == a) {
            if (b < c) {
                System.out.printf("%d + %d = %d", b, c, a);
            }if(b>c) {
                System.out.printf("%d + %d = %d", c, b, a);
            }
        }else {
            System.out.println("No");
        }

    }
}