LaTeX公式编辑器
https://www.codecogs.com/latex/eqneditor.php
http://latex.91maths.com/
图、坐标系绘制
https://csacademy.com/app/graph_editor/
函数绘制
http://zuotu.91maths.com/#W3sidHlwZSI6MCwiZXEiOiJ4XjIiLCJjb2xvciI6IiMwMDAwMDAifSx7InR5cGUiOjEwMDB9XQ--
https://www.desmos.com/calculator
数列查找(找规律神器)
http://oeis.org/
BZOJ题号查找器
https://ruanx.pw/bzojch/bzojno.html
OI Wiki
https://oi-wiki.org/
C++参考手册
https://zh.cppreference.com/w/cpp
各大国外OJ比赛查询:
https://kontests.net/
C++的一些优化
https://blog.csdn.net/qq_40155097/article/details/83083051
对线专用人肉搜索(误
https://bytew.net/OIer/
Euler Project:
http://pe-cn.github.io/problems/
https://projecteuler.net/progress