目录见下
K-th Number
2588: Spoj 10628. Count on a tree
4448: [Scoi2015]情报传递
3123: [Sdoi2013]森林
3207: 花神的嘲讽计划Ⅰ
DQUERY - D-query
4026: dC Loves Number Theory
#77. A+B Problem
3585: mex
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