jAVA. Stop the Stranger Insects We used to have very clean classroom. However, d
ID: 3850736 • Letter: J
Question
jAVA. Stop the Stranger Insects We used to have very clean classroom. However, due to the unusual weather this year, some strange insects (we call them Java) were spotted in this room (do not be scared, they do nothing harmful, except disgusting). Female Java can give birth to about 30 baby Java each week. These mature quickly, and within a week can have litters of their own. And so, a few weeks later, Java were overrunning the classroom and everyone feel disgusting. One of our students finds a special way to kill these insects by writing java program. His program kills the insects as follows: It assumes there are E female Java and E male Java in a week, his program kills a percentage p of all Java, males and females in equal proportion (if after this slaughter you end up with 30.7 males and 32.8 females, round these down). It assumes that every surviving female will give birth to R baby Java within a week, and if R is odd, the odd baby Java will be a female. These Java will reach reproduction age by next week and will be ready to reproduce. Ultimately, we would like to be able to enter E, p, and R parameters into the model, and get an answer of how many Java are expected to be alive in X weeks from the start of the model. For example, if there were 100 female and 100 male Java in the week 1. the query for week one will return 200, no matter what p and R values are. If the query is for week 2, and the parameters are p=50, R=9, there will be 50 females and 50 males surviving into week 2, and each of those 50 females will bear 5 female baby Java and 4 male baby Java that week. 50 by next week, there will be 550 Java: 300 females and 250 males. In week 3, 150 surviving female Java will again bear 5 female and 4 male baby Java to add to the population. A sample solution is provided for testing. lnput: Input consists of a number of n (n <= 1000) independent problems to be solved. Each following line contains four positive integers: E s<=1000, p<=100, R<=50 and X<=10 Sample input: 4 100 50 9 1 100 50 9 2 100 50 9 3 100 50 9 8 Output: Output should consist of n lines. Each line is a solution to a single problem from the input. Each line should be a single e positive integer: the number of Java alive in the week X from the start of the model. The number may be large, but will not exceed 1,000,000,000. Sample output: Female=100 Male=100 Female=300 Male=250 Female=900 Male=725 Female=218700 Male=174960
Explanation / Answer
/*
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* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package chegg.june;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
/**
*
* @author Sam
*/
public class StrangerInsect {
public static void calculate(int e, int p, int r, int x) {
int male = e;
int female = e;
int newFemale;
int newMale;
for (int i = 1; i < x; i++) {
//System.out.println("male was:"+male+" tfemale was:"+female);
male -= (int)(male *(double)p/100);
female -= (int)(female *(double)p/100);
int maleChild = r/2;
int femaleChild = r - maleChild;
//System.out.println("male is:"+male+" tfemale is:"+female);
//System.out.println("maleChild is:"+maleChild+" tfemaleChild is:"+femaleChild);
newFemale = female * femaleChild;
newMale = female * maleChild;
female += newFemale;
male += newMale;
}
System.out.println("Female="+female+" Male="+male);
}
public static void main(String[] args) throws FileNotFoundException {
Scanner sc = new Scanner(new File("testFile"));
String x = sc.nextLine();
System.out.println(x);
int n = Integer.parseInt(x);
for (int i = 0; i < n; i++){
int E = sc.nextInt();
int p = sc.nextInt();
int R = sc.nextInt();
int X = sc.nextInt();
calculate(E, p, R, X);
}
}
}
Your code is ready. Hope you like it.
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