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  1. Practice
  2. Algorithms
  3. Warmup
  4. Diagonal Difference
  5. Discussions

Diagonal Difference

  • jefflima + 2 comments

    Really nice one.

    You can actually move up the k -= 1 into the outer loop next to the i++ as:

    int sum1=0,sum2=0;   

for(int i=0, k=size-1; i< size; i++, k--){
    for(int j=0; j< size; j++){
        cin >> matrix[i][j];            
        if(i==j)
         sum1 += matrix[i][j];                        
    }
    sum2 += matrix[i][k];              
}

cout << abs(sum1-sum2);
    • misgevolution + 0 comments

      Yes, thanks!

    • Deeps79 + 2 comments

      what's the use of k here?? k=size-1...and k-- ? can Anyone help out..please

      • abhijith4514 + 0 comments

        Try writing a matrix in a paper and also give values to i,j,k as given above. You will understand why we need "k" much better that way, than just reading the code.

      • aviral16austy + 2 comments

        yes I dont get k? i reprents rows,j represents columns i think but k?

        • aman1996esseffc1 + 0 comments

          well you can use i in place of k that's not a problem that's just a variable used for looping

        • Kanahaiya + 0 comments

          Here is the video explaination- https://youtu.be/f6bTIsj9ne8