Educational Codeforces Round 159 (Rated for Div. 2)

E. Collapsing Strings

https://codeforces.com/contest/1902/problem/E

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Codeforces Round 911 (Div. 2)

D. Small GCD

https://codeforces.com/contest/1900/problem/D

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Educational Codeforces Round 158 (Rated for Div. 2)

D. Yet Another Monster Fight

https://codeforces.com/contest/1901/problem/D

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Educational Codeforces Round 158 (Rated for Div. 2)

C. Add, Divide and Floor

https://codeforces.com/contest/1901/problem/C

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Codeforces Round 909 (Div. 3)

G. Unusual Entertainment

https://codeforces.com/contest/1899/problem/G

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Codeforces Round 908 (Div. 2)

E. Freedom of Choice

https://codeforces.com/contest/1894/problem/E

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