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\documentclass[12 pt]{article}
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\usepackage{amsfonts, amssymb, amsmath, graphicx, physics, algpseudocode, fontspec}
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\setmainfont{PingFang SC}
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\usepackage{xeCJK}        % 中文支持
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\setCJKmainfont{PingFang SC}
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\oddsidemargin=-0.5cm
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\setlength{\textwidth}{6.5in}
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\addtolength{\voffset}{-20pt}
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\addtolength{\headsep}{25pt}
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\setlength{\parindent}{0pt}
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\usepackage[ruled,vlined,linesnumbered]{algorithm2e}
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\DontPrintSemicolon
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\pagestyle{myheadings}
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\markright{Lixi Zhang\hfill Homework 3\hfill Algorithm Design \hfill}
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\newcommand{\eqn}[0]{\begin{array}{rcl}}
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\newcommand{\eqnend}[0]{\end{array} }
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\newcommand{\qed}[0]{$\square$}
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% 插入一个图片
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% \includegraphics[width=\linewidth]{1.jpeg}
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\begin{document}
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\end{document}