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0017.电话号码的字母组合：“二位数组” -> “二维数组”

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problems/0017.电话号码的字母组合.md
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## 数字和字母如何映射 ## 数字和字母如何映射
可以使用map或者定义一个二位数组，例如：string letterMap[10]，来做映射，我这里定义一个二维数组，代码如下： 可以使用map或者定义一个二维数组，例如：string letterMap[10]，来做映射，我这里定义一个二维数组，代码如下：
```cpp ```cpp
const string letterMap[10] = { const string letterMap[10] = {