diff --git a/.gitignore b/.gitignore
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 build/
 
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-.DS_Store
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+.DS_Store
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+使用C++重写了一下，基于`Gauss-Salamin-Brent`迭代法，使用`gmp`和`mpfr`库，计算到小数点后1e6位，标准答案来自<https://www.damienelliott.com/1-million-digits-of-pi/>
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