We use cookies to ensure you have the best browsing experience on our website. Please read our cookie policy for more information about how we use cookies.
hey pumaboy, try writing out the matrix on paper and mark each box in matrix with row,col coordinates. To get the secondary diagonal, we need the values of [0,2] + [1,1] + [2,0]. Now think about how you would to these coordinates with a for loop. Think about how would you set up your if statements within your loop to capture these values?
public static int diagonalDifference(List> arr) {
// Write your code here
int lastelementindex = arr.size() -1;
int primarydiag = 0;
int secundarydiag = 0;
for (int i=0; i < arr.size(); i++ ){
primarydiag += arr.get(i).get(i);
// reversing array
secundarydiag += arr.get(lastelementindex - i).get(i);
}
Diagonal Difference
You are viewing a single comment's thread. Return to all comments →
Same, though my second if statement was the mathematically equivalent (i == (numInputs - j -1)).
i=numinputs-j+1
i didn't understand the above logic..help me out
hey pumaboy, try writing out the matrix on paper and mark each box in matrix with row,col coordinates. To get the secondary diagonal, we need the values of [0,2] + [1,1] + [2,0]. Now think about how you would to these coordinates with a for loop. Think about how would you set up your if statements within your loop to capture these values?
public static int diagonalDifference(List> arr) { // Write your code here int lastelementindex = arr.size() -1; int primarydiag = 0; int secundarydiag = 0; for (int i=0; i < arr.size(); i++ ){ primarydiag += arr.get(i).get(i); // reversing array secundarydiag += arr.get(lastelementindex - i).get(i); }