1.LLRR http://opentrains.snarknews.info/~ejudge/team.cgi?SID=07ce0b0b8b50b3dd&action=2<=1
2.接力赛 http://opentrains.snarknews.info/~ejudge/team.cgi?SID=f7174dac67215648&action=2<=1
3、4. atcoder http://arc080.contest.atcoder.jp/
5.类阿基米德螺线（其实并不是） http://opentrains.snarknews.info/~ejudge/team.cgi?SID=6b3bfde63c414e96&action=2<=1
6.线段树点修改区间查询 https://www.nowcoder.com/acm/contest/submit/1e9d3c4b48b34dafb87b5ee883ffedc4?ACMContestId=4&tagId=4
