Created
May 15, 2013 09:38
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输入一个数x，不采用加号或减号,返回x+1的值（微软实习生面试）
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| (x & 1) ? (x << 1 | 1) & ~x : (x | 1); | |
| // by 烧掉回忆 http://www.dewen.org/q/12697#ans23348 |
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