「CodeForces 553E」Kyoya and Train

12-11

「CodeForces 1054H」Epic Convolution

12-11

「CodeForces 848E」Days of Floral Colours

12-09

「CodeForces 438E」The Child and Binary Tree

03-22

「CodeForces 501D」Misha and Permutations Summation

11-19

「CodeForces 1060C」Maximum Subrectangle

10-15

「CodeForces 402E」Strictly Positive Matrix

08-11

「CodeForces 191C」Fools and Roads

08-07