LaTeX Equation Editor
https://www.codecogs.com/latex/eqneditor.php
http://latex.91maths.com/
view coordinate system to draw
https://csacademy.com/app/graph_editor/
plotted as a function
http: //zuotu.91maths.com/#W3sidHlwZSI6MCwiZXEiOiJ4XjIiLCJjb2xvciI6IiMwMDAwMDAifSx7InR5cGUiOjEwMDB9XQ--
number of columns to find (to find the law artifact)
http://oeis.org/
BZOJ title number Locator
https://ruanx.pw/bzojch/bzojno.html
OI Wiki
HTTPS: / /oi-wiki.org/
C ++ reference Manual
https://zh.cppreference.com/w/cpp
OI Useful Links
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Origin www.cnblogs.com/gmh77/p/11482692.html
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