add wavelet tree

[lrvideckis]

https://github.com/brunomaletta/Biblioteca/blob/master/Codigo/Estruturas/waveletTree.cpp https://github.com/ucf-programming-team/hackpack-cpp/blob/master/content/data-structures/YoinkedWavelet.h

[lrvideckis]

https://codeforces.com/blog/entry/52854

[lrvideckis]

https://codeforces.com/blog/entry/113196

[lrvideckis]

https://codeforces.com/blog/entry/89110?#comment-775550

[lrvideckis]

https://codeforces.com/blog/entry/17787

[lrvideckis]

https://judge.yosupo.jp/problem/point_add_rectangle_sum

[lrvideckis]

https://github.com/lrvideckis/programming_team_code/pull/406

[lrvideckis]

https://ioinformatics.org/journal/v10_2016_19_37.pdf

[lrvideckis]

https://github.com/lrvideckis/programming_team_code/pull/411