Need a test case with a 0 on the chosen diagonal.
Agree with Jon's comment that the matrix should contain 0 elements
so simple that it never occurred to me
Find the peak 3n+1 sequence value
Get the area codes from a list of phone numbers
Back to basics 11 - Max Integer
Implement a bubble sort technique and output the number of swaps required
Sum the numbers on the main diagonal
Find my secret number
Permute diagonal and antidiagonal
Find Missing Number
Recycled Numbers (CodeJam Qualification Round 2012)
Mysterious digits operation (easy)
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