1.http://www.51nod.com/Challenge/Problem.html#problemId=1682
2.http://www.51nod.com/Challenge/Problem.html#problemId=1388
3.http://www.51nod.com/Challenge/Problem.html#problemId=1076
4.http://www.51nod.com/Challenge/Problem.html#problemId=1215
5.https://ac.nowcoder.com/acm/problem/19995
参加牛客比赛,然后有时间就把之前线段树写写啦.