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BOPOHOB / Depth-first-search

Depth-first search for Sudoku
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Depth-first-search

Depth-first search for field whish sould be filed with follow limitations:

  1. In each column or row should contain each of different symbols.
  2. It must be fast (less then 1 second duration). The way to reach necessary efficiency is combination of heuristics.

It was tested on Qt 5.4.2 and 5.7.0 on minGW (32bit) and MS2015 (64bit)