Why i am not getting the correct answer?

Question

I am solving hour glass challenge from hacker and came up with the following code but it is not giving the correct answer even i checked on internet so they are also giving me the same code, but it is giving an incorrect answer.
https://code.sololearn.com/craBDgGMW8R5/?ref=app

Answer 1

Hi! I have found your error. You placed the "if (max < sum) {...}" outside of the second "for" loop, but you need to compare the maximum value for every sum, not only for the last hourglass pattern on each row!

Take a look here:
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
sum = arr[i][j] + arr[i][j + 1] + arr[i][j + 2] + arr[i + 1][j + 1] + arr[i + 2][j] + arr[i + 2][j + 1] + arr[i + 2][j + 2];
if (max < sum) {
max = sum;
}
}
}

I run your modified code on HackerRank (without a submission) with their test cases and with my custom input case and it has passed successfully all cases.

Answer 2

Abhishek Dimri, please post a link to the challenge description and what result do you expect to be correct.

At least for an input as:
1 2 3 4 5 6
1 2 3 4 5 6
1 2 3 4 5 6
1 2 3 4 5 6
1 2 3 4 5 6
1 2 3 4 5 6
your code returns "max = 35" which is the correct result and it is correctly printed on standard output using "cout << result;".

Answer 3

@Vasile Eftodii
https://www.hackerrank.com/challenges/2d-array/problem?h_l=interview&playlist_slugs%5B%5D=interview-preparation-kit&playlist_slugs%5B%5D=arrays
here is the link of the question