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- 2013-08-29
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- 贾宝奇
Description: Optimization of a Sudoku Answer: When the test value, the reference-friendly, with square columns and with other grid values. Such other grid already filled 1,3,4,6,8, then the current grid can only take values from 2,5,7,8,9. Optimization 2 (already added): The 0-80 converted to the corresponding horizontal and vertical coordinates is very time-consuming operation (division and divisibility), you can use a table-driven approach, pre-stocked their mapping space for time (space consumption is not on a 81 element HashMap).
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