树链剖分
2021-08-31
CF1538D Another Problem About Dividing Numbers
AT2830 辞書順で何番目?题解
CF135C Zero-One
CF1466B Last minute enhancements
CF1521A Nastia and Nearly Good Numbers
CF1538B Friends and Candies
CF1538A Stone Game
CF1538C Number of Pairs
CF731E Funny Game