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Merge pull request kdn251#53 from xdream86/patch-1
Update README-zh-cn.md
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README-zh-cn.md

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* 设置第 k 位: `s |= (1 << k)`
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* 第 k 位置零: `s &= ~(1 << k)`
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* 切换第 k 位值: `s ^= ~(1 << k)`
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* 乘以 2: `s << n`
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* 除以 2: `s >> n`
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* 乘以 2<sup>n</sup>: `s << n`
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* 除以 2<sup>n</sup>: `s >> n`
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* 交集: `s & t`
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* 并集: `s | t`
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* 减法: `s & ~t`

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