线段树题目存档
http://andyzh1314.ycool.com/post.1050703.html
http://www.notonlysuccess.com/index.php/segment-tree-complete/
http://chuanwang66.iteye.com/blog/1418459
http://chuanwang66.iteye.com/blog/1489811
Top Coder - RMQ & LCA
http://community.topcoder.com/tc?module=Static&d1=tutorials&d2=lowestCommonAncestor
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