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例子
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数组的左上角:
1, 3, 7, 15, 31, 63, 127, 255, 511, 1023, 2047, 4095
2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096
5, 10, 19, 38, 74, 146, 290, 578, 1154, 2306, 4610, 9218
6, 11, 22, 42, 82, 162, 322, 642, 1282, 2562, 5122, 10242
9, 18, 35, 70, 138, 274, 546, 1090, 2178, 4354, 8706, 17410
12, 23, 46, 89, 176, 350, 695, 1387, 2770, 5535, 11067, 22128
13, 25, 49, 97, 193, 385, 769, 1537, 3073, 6145, 12289, 24577
14, 26, 50, 98, 194, 386, 770, 1538, 3074, 6146, 12290, 24578
17, 34, 67, 134, 266, 530, 1058, 2114, 4226, 8450, 16898, 33794
20, 39, 78, 153, 304, 606, 1207, 2411, 4818, 9631, 19259, 38512
...
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