I need some problems about stack and LCA, can anyone help me?
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I need some problems about stack and LCA, can anyone help me?
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You can find some here: http://uhunt.felix-halim.net
Key in any UVa account name and you should be able to see a list of problems from UVa Online Judge categorised by topics. Stack is under Data Structures and Libraries while LCA is under Rare Topics.
Maybe you should try these
http://vn.spoj.com/problems/CHEAT/
http://vn.spoj.com/problems/KAGAIN/
http://vn.spoj.com/problems/QBRECT/
http://codeforces.net/contest/379/problem/F
for LCA — try http://www.spoj.com/problems/LCA/.