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例子
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数组的左上角从行x=0开始,列y>=0为:
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, ...
1, 1, 3, 3, 5, 5, 7, 7, 9, 9, 11, 11, 13, ...
2, 3, 2, 3, 6, 7, 6, 7, 10, 11, 10, 11, 14, ...
3, 3, 3, 3, 7, 7, 7, 7, 11, 11, 11, 11, 15, ...
4, 5, 6, 7, 4, 5, 6, 7, 12, 13, 14, 15, 12, ...
5, 5, 7, 7, 5, 5, 7, 7, 13, 13, 15, 15, 13, ...
6, 7, 6, 7, 6, 7, 6, 7, 14, 15, 14, 15, 14, ...
7, 7, 7, 7, 7, 7, 7, 7, 15, 15, 15, 15, 15, ...
8, 9, 10, 11, 12, 13, 14, 15, 8, 9, 10, 11, 12, ...
9, 9, 11, 11, 13, 13, 15, 15, 9, 9, 11, 11, 13, ...
10, 11, 10, 11, 14, 15, 14, 15, 10, 11, 10, 11, 14, ...
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