Data-Structure:WaveletMatrix

#	ID	Name	Difficulty	Solver
1	abc234_d	D. Prefix K-th Max	503	9241
2	abc239_e	E. Subtree K-th Max	1084	5347
3	abc281_e	E. Least Elements	1334	4124
4	abc231_f	F. Jealous Two	1580	2700
5	abc339_g	G. Smaller Sum	1792	2091