测试文档

代码功能测试

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int read()
{
    int x = getchar(), ans = 0;
    while(x < '0' || x > '9')
        x = getchar();
    while('0' <= x && x <= '9')
        ans = ans * 10 + x - '0', x = getchar();
    return ans;
}

公式测试

\(\sum^n_{i=1}\dfrac{1}{i}=\ln n + C\)