Deque 

(Tìm min/max trong đoạn tịnh tiến)

http://vn.spoj.com/submit/MINK/ - solution - code

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

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

http://vn.spoj.com/problems/C11CIR/ - solution - code