Sum the same indexed (unique) rows. Examine the test suite.
Related Challenge - Problem 2172. Delete the rows in the middle
Scoring for oriented dominoes
Multiply a column by a row
Check if number exists in vector
Is the input divisible by 3?
Swap two numbers
Challenging perms function!
Find two triangular numbers whose sum is input.
Find the biggest digit in a matrix
String permutations on phone keyboard
Is there a GPU Device?
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