比如有一个数组{5,6,8,3,9,7,1,2,4}，输出为
9 5
8 3
7 6
6 2
5 1
4 9
3 4
2 8
1 7
数组有可能有重复的数字
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比如有一个数组{5,6,8,3,9,7,1,2,4}，输出为
9 5
8 3
7 6
6 2
5 1
4 9
3 4
2 8
1 7
数组有可能有重复的数字
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