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The brutal force solution is O(N^(N^2)) I think, , here N is the length/width of the matrix.
- jasonust4 January 15, 2015If you use some knowledge from combination, which means choosing 2 different integers from 4 and interchange them, then you can optimize the process to be O(N^6). And if you use hashtable, then you can make it O(N^4).