We have a logical array (with ones and zeroes). It is simple: after processing every column may only contain a single true value, or none at all. Not on any row, but only the uppermost occurrence in the input array, if any.

For example:

 [ 0 0 1 1
   0 1 0 1
   0 0 1 1 ] 
becomes 
 [ 0 0 1 1
   0 1 0 0
   0 0 0 0 ]

And of course, your solution should be the most innovative, shortest and most elegant one.

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Last Solution submitted on Apr 14, 2026

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minnolina Pauli Huusari Riccardo G. Lorenzo

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