Question

Срочноооооо
Крик души информатика

Answer 1

1)
import java.util.Scanner;

public class Main {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
int[] a = new int[in.nextInt()];
int sum1 = 0, sum2 = 0;
for (int i = 0; i < a.length; i++) {
a[i] = in.nextInt();
}
for (int x : a) {
System.out.print(x + " ");
}
System.out.println();
for (int i = 0; i < a.length; i+=2) {
sum1+=a[i];
if (i >= a.length-2) break;
}
System.out.println(sum1);
for (int i = 1; i < a.length; i+=2) {
sum2+=a[i];
if (i >= a.length-2) break;
}
System.out.println(sum2);
}
}

2)
import java.util.Scanner;

public class Main {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
int[] a = new int[in.nextInt()];
for (int i = 0; i < a.length; i++) {
a[i] = in.nextInt();
}
for (int i = (a.length % 2 == 1) ? a.length-1 : a.length-2; i >= 0; i-=2) {
System.out.print(a[i] + " ");
if (i < 2) break;
}
}
}

3)
import java.util.Scanner;

public class Main {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
double[] time = new double[in.nextInt()];
double c = 0;
for (int i = 0; i < time.length; i++) {
time[i] = in.nextDouble();
}
int i = in.nextInt();
for (int j = 0; j < i-1; j++) {
c+=time[j];
}
System.out.println(c);
}
}