$$ \def\b#1{\textbf{#1}}\def\t#1{\text{#1}}\def\s\qquad\def\P{\mathbb P}\def\l{\underline{\kern{300pt}}}\def\m#1{#1&\,} \def\if#1{\b{if }#1\b{ then}}\def\endfunc{\b{end function}.}\def\endif{\b{end if}.}\def\func{\b{function}}\def\return{\b{return}} \begin{aligned}&\l\\&\b{Function: }\t{Build a Segment Tree.}\\[-10pt]&\l\\[-5pt]&\begin{array}{r|l}\\[-9pt] \m1\func\ \t{BuildSegmentTree}\left(x,l,r\right):\\ \m2\s\if{\left(l\ne r\right)}:\\ \m3\s\s m\gets\left\lfloor\left(l+r\right)/2\right\rfloor.\\ \m4\s\s\t{BuildSegmentTree}\left(2x,l,m\right).\\ \m5\s\s\t{BuildSegmentTree}\left(2x+1,m+1,r\right).\\ \m6\s\endif\\ \m7\endfunc\\[-10pt]\\\end{array}\\[-13pt]&\l\end{aligned} $$

$\color{#9D3DCF}{\texttt{图挂了}}$

\begin{equation} \frac{-b + \sqrt{b^2 - 4ac}}{2a} \end{equation}

$L^AT_EX$

$a+b-c\time d/e$

$\LaTeX$

$\LaTeX$

$LaTeX$

$\LaTeX$

−𝑏+𝑏2−4𝑎𝑐‾‾‾‾‾‾‾‾√2𝑎

$2^2$

$√2$

$\dfrac{-b\pm sqrt{b^2-4ac}}{2a}$

$$\LaTeX$$ $$\dfrac{-b\pm \sqrt{b^2-4ac}}{2a}$$

> > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > $\color{red} I AK IOI!$

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\begin{equation} \frac{-b + \sqrt{b^2 - 4ac}}{2a} \end{equation}

$(a + b)^2$

<math xmlns="http://www.w3.org/1998/Math/MathML" display="block"> <mfrac> <mrow> <mo>&#x2212;<!-- − --></mo> <mi>b</mi> <mo>+</mo> <msqrt> <msup> <mi>b</mi> <mn>2</mn> </msup> <mo>&#x2212;<!-- − --></mo> <mn>4</mn> <mi>a</mi> <mi>c</mi> </msqrt> </mrow> <mrow> <mn>2</mn> <mi>a</mi> </mrow> </mfrac> </math>