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\documentclass[border=10pt,varwidth]{standalone}
\usepackage[left=25mm,right=25mm,top=25mm,bottom=25mm]{geometry}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{times}
\usepackage{geometry}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{mathrsfs}
\usepackage{amsfonts}
\usepackage{amsthm}
\usepackage{lipsum}
\usepackage{amscd}
\usepackage{graphicx}
\usepackage{fancyhdr}
\usepackage{textcomp}
\usepackage{pgfplots}
\usepackage{txfonts}
\usepackage[all]{xy}
\usepackage{paralist}
\usepackage[colorlinks=true]{hyperref}
\usepackage{array}
\usepackage{tikz}
\usepackage{slashed}
\usepackage{pdfpages}
\usepackage{cite}
\usepackage{url}
\usepackage{amsmath,amsfonts,amssymb}
\usepackage{tikz}
\usetikzlibrary{arrows,matrix,positioning}
\usetikzlibrary{overlay-beamer-styles}
\usetikzlibrary{matrix.skeleton}
\usetikzlibrary{automata,positioning}
\usetikzlibrary{decorations.text}
\usepackage{listings}
\usepackage{multirow}
\usepackage{color}
\begin{document}
\begin{tikzpicture}
\begin{axis}[
axis lines = left,
xlabel = $n$ (Data Input),
ylabel = {$t$ (time)},
legend pos=north east,
very thick,
ymax = 500,
yticklabels=\empty,
xticklabels=\empty,
scale only axis=true,
width=12cm, height=6cm,
]
\addplot [
domain= 1:20,
samples=100,
color=red,
]
{1};
\addlegendentry{$\mathcal{O}(1)$}
\addplot [
domain= 1:20,
samples=100,
color=green,
]
{x};
\addlegendentry{$\mathcal{O}(n)$}
\addplot [
domain= 1:20,
samples=100,
color=blue,
]
{x^2};
\addlegendentry{$\mathcal{O}(n^2)$}
\addplot [
domain= 1:10,
samples=100,
color=purple,
]
{x^3};
\addlegendentry{$\mathcal{O}(n^3)$}
\addplot [
domain= 1:10,
samples=100,
color=black,
]
{exp(x)};
\addlegendentry{$\mathcal{O}(e^n)$}
\addplot [
domain= 1:20,
samples=100,
color=orange,
]
{log2(x)};
\addlegendentry{$\mathcal{O}(\log n)$}
\addplot [
domain= 1:20,
samples=100,
color=gray,
]
{x*log2(x)};
\addlegendentry{$\mathcal{O}(n \log n)$}
\end{axis}
\end{tikzpicture}
\end{document}
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