latex 如何在overleaf中插入算法伪代码

问题描述

博主今天在用overleaf写论文，急需插入伪代码，将查阅结果记录在此以便后续参考。

解决方案

overleaf有专门的说明文档来教大家如何正确插入伪代码：

https://www.overleaf.com/learn/latex/Algorithms

 列举几种样式与其对应的latex源码。

样式1

 Latex源码：

\documentclass{article}
\usepackage{algorithm}
\usepackage{algpseudocode}
\begin{document}
\begin{algorithm}
\caption{An algorithm with caption}\label{alg:cap}
\begin{algorithmic}
\Require $n \geq 0$
\Ensure $y = x^n$
\State $y \gets 1$
\State $X \gets x$
\State $N \gets n$
\While{$N \neq 0$}
\If{$N$ is even}
    \State $X \gets X \times X$
    \State $N \gets \frac{N}{2}$  \Comment{This is a comment}
\ElsIf{$N$ is odd}
    \State $y \gets y \times X$
    \State $N \gets N - 1$
\EndIf
\EndWhile
\end{algorithmic}
\end{algorithm}

\end{document}

样式2

 Latex源码：

\documentclass{article}
\usepackage{algorithm2e}
\begin{document}
%% This declares a command \Comment
%% The argument will be surrounded by /* ... */
\SetKwComment{Comment}{/* }{ */}
\RestyleAlgo{ruled}
\begin{algorithm}
\caption{An algorithm with caption}\label{alg:two}
\KwData{$n \geq 0$}
\KwResult{$y = x^n$}
$y \gets 1$\;
$X \gets x$\;
$N \gets n$\;
\While{$N \neq 0$}{
  \eIf{$N$ is even}{
    $X \gets X \times X$\;
    $N \gets \frac{N}{2}$ \Comment*[r]{This is a comment}
  }{\If{$N$ is odd}{
      $y \gets y \times X$\;
      $N \gets N - 1$\;
    }
  }
}
\end{algorithm}

\end{document}

样式3

Latex源码：

\documentclass{article}
\usepackage{algorithm2e}
\begin{document}
%% This declares a command \Comment
%% The argument will be surrounded by /* ... */
\SetKwComment{Comment}{/* }{ */}

\begin{algorithm}
\caption{An algorithm with caption}\label{alg:two}
\KwData{$n \geq 0$}
\KwResult{$y = x^n$}
$y \gets 1$\;
$X \gets x$\;
$N \gets n$\;
\While{$N \neq 0$}{
  \eIf{$N$ is even}{
    $X \gets X \times X$\;
    $N \gets \frac{N}{2}$ \Comment*[r]{This is a comment}
  }{\If{$N$ is odd}{
      $y \gets y \times X$\;
      $N \gets N - 1$\;
    }
  }
}
\end{algorithm}

\end{document}

以下两种代码来自：

用LaTeX优雅地书写伪代码：Algorithm2e简明指南

样式4

 Latex源码：

\def\SetClass{article}
\documentclass{\SetClass}
\usepackage[ruled,linesnumbered]{algorithm2e}
\begin{document}
\begin{algorithm}
\caption{Simulation-optimization heuristic}\label{algorithm}
\KwData{current period $t$, initial inventory $I_{t-1}$, initial capital $B_{t-1}$, demand samples}
\KwResult{Optimal order quantity $Q^{\ast}_{t}$}
$r\leftarrow t$\;
$\Delta B^{\ast}\leftarrow -\infty$\;
\While{$\Delta B\leq \Delta B^{\ast}$ and $r\leq T$}{$Q\leftarrow\arg\max_{Q\geq 0}\Delta B^{Q}_{t,r}(I_{t-1},B_{t-1})$\;
$\Delta B\leftarrow \Delta B^{Q}_{t,r}(I_{t-1},B_{t-1})/(r-t+1)$\;
\If{$\Delta B\geq \Delta B^{\ast}$}{$Q^{\ast}\leftarrow Q$\;
$\Delta B^{\ast}\leftarrow \Delta B$\;}
$r\leftarrow r+1$\;}
\end{algorithm}
\end{document}

样式5

Latex源码： 

\documentclass{article}
\usepackage[linesnumbered, ruled]{algorithm2e}
\SetKwRepeat{Do}{do}{while}%
\begin{document}

\begin{algorithm}[H]
  \KwData{this text}
  \KwResult{how to write algorithm with \LaTeX2e }
  initialization\;
  \While{not at end of this document}{
    read current\;
    \Repeat{this end condition}{
      do these things\;
    }
    \eIf{understand}{
      go to next section\;
      current section becomes this one\;
    }{
      go back to the beginning of current section\;
    }
    \Do{this end condition}{
      do these things\;
    }
  }
  \caption{How to write algorithms}
\end{algorithm}

\end{document}

注意：如果伪代码每行前面一直出现编号，可以检查是不是添加了额外的跟伪代码相关的包，一般来说删除之后便可解决问题。

更多解释和代码示例见上面列出的官方文档链接地址和微信公众号。

祝各位友友们写论文愉快~