I guess zeros are not included as common elements.
Yes. Seems to be a somewhat "ill-posed" problem...
What does "they share a common row, column entry" mean?
Re-wording is needed for this problem. Here is how I interpreted the problem:
1. "common row, column entry" means a same value at the same row-column location
2. zeros don't count. You need to check for non-zeros...
It dseon't mettar waht oedrr the lrettes in a wrod are.
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