This time out, the old C hacker drags himself into the 1990s to solve Sudoku puzzles. Have you ever see a puzzle that made you want to write a program to solve it? I had that feeling a few months ago, when I noticed Sudoku in our local paper.

Writing a program to address this puzzle shouldn't be all that hard. First, you need a data structure. You could number the cells from 0-80, like this:

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