Data Structures and Algorithms in Java
6th Edition
ISBN: 9781118771334
Author: Michael T. Goodrich
Publisher: WILEY
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Chapter 5, Problem 23C
Explanation of Solution
Recursive method to determine the sum of two elements is equal to “n”:
Create the method checkSum() that accepts the input parameter as “A”, “j”, and “k” to determine the sum of two elements in an array “A” is equal to “A[i]” by calling this method recursively.
Method definition:
//Define the checkSum() method
public static boolean checkSum(int A[], int j, int k)
{
//Loop executes until the array length
for (int i = 0; i < A.length; i++)
{
//Check whether "j" and "k" is less than "i"
if((i > j) && (k < i))
{
/*Check whether sum of "A[j]" and "A[k]" is equal to "A[i]". */
if (A[i] == A[j] + A[k])
{
/*Return true, if there are elements in array "A" that sum is equal to "A[i]". */
return true;
}
}
}
//Check whether "k+1" is equal to length of array
if (k + 1 == A.length)
{
/*Check whether "j+1" is less than to length of array. */
if (j + 1 < A.length)
{
/*Call checkSum() method recursively by passing the parameters as "A", "j+1", and "0" to sum the two elements is equal to "A[i]" and return it */
return checkSum(A, j + 1, 0);
}
/*Return true, if there are no elements in array "A" that sum is equal to "A[i]"...
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Chapter 5 Solutions
Data Structures and Algorithms in Java
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