Thuật toán Tarjan 

Cầu khớp 

Liên thông mạnh - Song liên thông

http://vn.spoj.com/problems/GRAPH_/ - solution - code

http://vn.spoj.com/problems/WEATHER/ - solution - code

http://vn.spoj.com/problems/CRITICAL - solution

http://vn.spoj.com/problems/TJALG/ - solution1,2 - code1,2

http://vn.spoj.com/problems/NKONEARC/ - solution - code

http://vn.spoj.com/problems/MESSAGE/ - solution - code

http://vn.spoj.com/problems/NUMBER/ - solution - code

http://vn.spoj.com/problems/NKPOLICE/ - solution - code

http://vn.spoj.com/problems/TREAT/ - solution - code

http://vn.spoj.com/problems/SAFENET2/ - solution - code

http://vn.spoj.com/problems/REFORM/ - solution - code