A 站: AtCoder https://atcoder.jp/
B 站: BZOJ http://www.lydsy.com/JudgeOnline/ 哔哩哔哩 https://www.bilibili.com/
C 站: Codeforces https://codeforces.com/
D 站: uDebug https://udebug.com/diep io https://diep.io/
E 站: Project Euler https://projecteuler.net/
F 站: FZU OJ http://acm.fzu.edu.cn/
G 站: GitHub https://github.com/Graph Editor https://csacademy.com/app/graph_editor/generals io http://generals.io/
H 站: hzwer 的博客 http://hzwer.com/HDU OJ http://acm.hdu.edu.cn/
I 站: SMMS 图床 https://i.loli.net/路过图床 https://imgchr.com/
J 站: 计蒜客 https://www.jisuanke.com/
K 站: Kattis https://open.kattis.com/
L 站: 洛谷 https://www.luogu.com.cn/LOJ https://loj.ac/
M 站: 雀魂麻将 http://majsoul.union-game.com/#/
N 站: NOI http://www.noi.cn/
O 站: OIerDb http://bytew.net/OIer/OI Wiki https://oi-wiki.org/OEIS http://oeis.org/
P 站: POJ http://poj.org/Ubuntu Pastebin https://paste.ubuntu.com/
Q 站: QQ 空间 https://qzone.qq.com/
R 站: C++ Reference http://www.cplusplus.com/reference/C++ reference
https://zh.cppreference.com/
S 站: SPOJ https://www.spoj.com/slay one http://slay.one/surviv io https://surviv.io/
T 站: Topcoder https://www.topcoder.com/
U 站: UVa https://onlinejudge.org/UOJ https://uoj.ac/USACO http://www.usaco.org/
V 站: Virtual Judge https://vjudge.net/VisuAlgo https://visualgo.net/zh
W 站: 维基百科 https://zh.wikipedia.org/Y 站: YouTube https://www.youtube.com/
Z 站: 知乎 https://www.zhihu.com/