【Codeforces 653F】Paper task

【Codeforces 639C】Bear and Polynomials

【Codeforces 639B】Bear and Forgotten Tree 3

【Codeforces 653G】Move by Prime

【Codeforces 659F】Polycarp and Hay

【Codeforces 659G】Fence Divercity

【Codeforces 653E】Bear and Forgotten Tree 2

【Codeforces 653D】Delivery Bears

【Codeforces 652E】Pursuit For Artifacts

【Codeforces 633G】Yash And Trees