Hello world

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这是第一篇博客，测试一下一些功能？

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\[f(x)=f(x_0)+\frac{f'(x_0)(x-x_0)}{1!}+\frac{f''(x_0)(x-x_0)^2}{2!}+ \cdots +\frac{f^{(n-1)}(x_0)(x-x_0)^{n-1}}{(n-1)!}+\frac{f^{(n)}(\xi)(x-x_0)^n}{n!},x\in[a,b]\]

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#include <bits/stdc++.h>
typedef long long LL;
#define FOR(i, a, b) for (int i = (a), i##_END_ = (b); i <= i##_END_; i++)
#define DNF(i, a, b) for (int i = (a), i##_END_ = (b); i >= i##_END_; i--)
template <typename Tp> void in(Tp &x) {
    char ch = getchar(), f = 1; x = 0;
    while (ch != '-' && (ch < '0' || ch > '9')) ch = getchar();
    if (ch == '-') f = -1, ch = getchar();
    while (ch >= '0' && ch <= '9') x = x * 10 + ch - '0', ch = getchar();
    x *= f;
}
template <typename Tp> Tp chkmax(Tp &x, Tp y) {return x > y ? x : x=y;}
template <typename Tp> Tp chkmin(Tp &x, Tp y) {return x < y ? x : x=y;}
template <typename Tp> Tp Max(Tp x, Tp y) {return x > y ? x : y;}
template <typename Tp> Tp Min(Tp x, Tp y) {return x < y ? x : y;}
int main()
{
    return 0;
}