Question 1

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package assignmentb;

import java.util.Scanner;

/**
 *
 * @author elyse
 */
public class FindUnsafeBanks {

 public static void main(String[] args) {
        //declare scanner
        Scanner input = new Scanner(System.in);
        System.out.println("Enter the number of banks here:"); //prompt user to enter # of banks
        int n = input.nextInt(); //where n is the number of banks entered

        System.out.println("Enter presecribed limit here: "); //prompt user to enter limit of the total assets
        int limit = input.nextInt(); //where limit is  the minimum amount of assets deemed to be safe

        //establish arrays to capture values
        double [] balance = new double[n]; //this array will have length n (the number of banks)
        double [][] borrowers = new double[n][n]; //the array will have length n (number of banks) and n number of cells in each row

        // if a bank is unsafe transfer values to a new array
        boolean[] unsafe = new boolean[n]; //the values of the banks which are deemed to be unsafe are transfered to this array

        //what is the current bank's balance/asset info?
        for (int i = 0; i < n; i++) {
        System.out.print("Enter the banks " + i + " asset info:");
        balance[i] = input.nextDouble();

        // number of banks that borrow money from current bank
        int m = input.nextInt();
            for (int j = 0; j < m; j++) {
            borrowers[i][input.nextInt()] = input.nextDouble();
            }
        }

    // Check for unsafe banks
    boolean unsafeFound;
    do {
    unsafeFound = false;
    for (int i = 0; i < n; i++) {
    // calculate bank i's asset
    double asset = balance[i];
    for (int j = 0; j < borrowers[i].length; j++) {
     asset += borrowers[i][j];
    }

    if (asset < limit) {
     unsafe[i] = true;
     // reset debt of the unsafe bank to zero
        for (double[] borrower : borrowers) {
            if (borrower[i] != 0) {
                borrower[i] = 0;
                // go through all the debt
                // default
                unsafeFound = true;
            }
        }
    }

   }

  } while (unsafeFound);

  // Print the result out

  System.out.print("The unsafe banks are:");
  for (int i = 0; i < unsafe.length; i++) {
   if (unsafe[i] == true) {
    System.out.print(i + " ");
   }

  }

 }

}