31 lines
873 B
C#
31 lines
873 B
C#
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class EightQueens {
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static bool[]
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up = { true, true, true, true, true, true, true, true, true, true, true, true, true, true, true },
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down = (bool[])up.Clone(),
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rows = new bool[8] { true, true, true, true, true, true, true, true };
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static public void Main() {
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for (int i = 0; i < up.Length; i++)
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up[i] = down[i] = true;
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for (int i = 0; i < rows.Length; ++i)
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rows[i] = true;
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queens(0, new int[8]);
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}
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static void queens(int c, int[] x) {
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for (int r = 0; r < rows.Length; r++)
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if (rows[r] && up[r-c+7] && down[r+c]) {
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rows[r] = up[r-c+7] = down[r+c] = false;
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x[c] = r;
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if (c == 7)
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print(x);
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else
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queens(c + 1, x);
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rows[r] = up[r-c+7] = down[r+c] = true;
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}
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}
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static void print(int[] x) {
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foreach (int c in x)
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System.Console.Write("{0}", c + 1);
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System.Console.WriteLine();
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}
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}
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