Check whether two given lines are orthogonal or not.
Two lines are orthogonal if they create a right angle at their intersections.
here (x1,y1) and (x2,y2) form a line.
Find common elements in matrix rows
Test for balanced parentheses
Find the sum of the elements in the "second" diagonal
Reverse the elements of an array
find number of times of occurrence of the most frequent number in a row vector
Count the days
Don't be Greedy!
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