Matrix
Two dimensional grids: traversal orders, rotations and in-place tricks.
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What you actually need to hold in your head
- Transpose then reverse rotates by 90 degrees
- Layer by layer spiral traversal
- Use row zero and column zero as marker storage
- Flatten an index as r times cols plus c
Comfortable with these first
Next in the path
Intervals
Patterns in this topic
The trigger phrases are what you are training yourself to notice.
Matrix problems
Ordered by sheet phase, so the early ones are the highest signal.
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