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David Verrelli

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David Verrelli submitted a Comment to Problem 43330. Solve expression III

AGREE with Jean-Marie Sainthillier: the major problem here is exposing the solution code within the Test Suite. The Test Suite should only contain _numerical_ answers. (At least the player must make a few small changes to the formula given in the Problem Statement.) See Problem 44521 for more discussion.

on 5 Jul 2018

David Verrelli liked Solution 1011496

on 5 Jul 2018

David Verrelli liked Solution 1043375

on 5 Jul 2018

David Verrelli liked Solution 1034489

on 5 Jul 2018

David Verrelli submitted a Comment to Problem 43553. Linear Least Squares (L2 fitting problem )

Hello, Luca Fenzi. This looks like an interesting problem. However, it can still be improved a bit.   (1) It is recommended that at least four test cases be provided, though more are often necessary to prevent hard-coded workarounds.   (2) The Test Suite does not rigorously check the individual elements of the output vector, only their sum; that leaves it open to passing completely incorrect submissions as demonstrated in Solution 1575892.   (3) In the Problem Statement, it is highly unlikely that the output would be exactly [4, -1]; the presence of random perturbations means that the output might be [4.3, -1.2] or [3.9, -0.8], say. Although there is a suitable allowance in the Test Suite for 'random' variation in the outputs, it would still be advisable to amend the Problem Statement.   —DIV

on 5 Jul 2018

David Verrelli submitted a Comment to Problem 43551. I told you not separate me, but you did :( - ACDC

Making a judgement about AC & DC based on only four points is unreliable. Not quite as flawed as the test cases in Problem 125, but still could be improved.

on 5 Jul 2018

David Verrelli liked Solution 1011753

on 5 Jul 2018

David Verrelli liked Solution 1139507

on 4 Jul 2018

David Verrelli liked Solution 1139022

on 4 Jul 2018

David Verrelli liked Solution 1138791

on 4 Jul 2018

David Verrelli liked Solution 1139403

on 4 Jul 2018

David Verrelli liked Solution 1255311

on 4 Jul 2018

David Verrelli submitted a Comment to Problem 44085. Can the given sides form a triangle?

Duplication of Problem 43294.

on 4 Jul 2018

David Verrelli submitted a Comment to Problem 43329. Solve expression II

Also the required code to pass the tests shouldn't be available by COPY-AND-PASTE from Test Suite!

on 4 Jul 2018

David Verrelli submitted a Comment to Problem 43301. Calculate inverse matrix in m by n matrix

The Test Suite needs to allow for floating-point errors in all test cases, as demonstrated in Solution 1575603. (Refer to Problem 44690.) Also, there should be at least four test cases for every problem.

on 4 Jul 2018

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