The description of this problem is not very clear. It's really asking for the first and last row for each unique value in the first column.
"However there will be more than one row index and that makes this question challenging." - that really explains nothing to me
Find the numeric mean of the prime numbers in a matrix.
Determine if input is odd
Given an unsigned integer x, find the largest y by rearranging the bits in x
Getting the absolute index from a matrix
Bridge and Torch Problem - Minimum time
Homemade: Control Charts
Hexagonal numbers on a spiral matrix
Produce the following matrix
Find two triangular numbers whose sum is input.
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