A better description for this problem can be found at http://joonprogramming.blogspot.com/2016/04/google-code-jam-qualification-round-1a_17.html We have to find an NXN matrix, without repeating numbers at any row or column that must be ordered. And we have 2*N-1 strips of scrambled numbers, which can be rows or columns. The problem is to find what the missing strip is (notice that a NXN matrix has 2*N strips).
First non-zero element in each column
Specific Element Count
Compute a dot product of two vectors x and y
Find the nearest integer
GJam 2012 Qualifier: Tongues
Knots Contest: Minimum Knots (TestSuite)
Rubik's Mini-Cube: Solve Randomized Mini-Cube - Score : Moves
Rubik's Cube: 30 Moves or Less : Contest Scoring (Time/Size/Moves)
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