Ojs

[CF] B. You Are Given a Decimal String... - Educational Codeforces Round 70 (Rated for Div. 2) [CF] D. Print a 1337-string... - Educational Codeforces Round 70 (Rated for Div. 2) [CF] C. You Are Given a WASD-string... - Educational Codeforces Round 70 (Rated for Div. 2) [CF] C. Game with Multiset - Educational Codeforces Round 160 (Rated for Div. 2) [CF] D. Array Collapse - Educational Codeforces Round 160 (Rated for Div. 2) [CF] A. Broken Keyboard - Educational Codeforces Round 75 (Rated for Div. 2) [CF] A. You Are Given Two Binary Strings... - Educational Codeforces Round 70 (Rated for Div. 2) [CF] B. Binary Palindromes - Educational Codeforces Round 75 (Rated for Div. 2) [CF] C. Minimize The Integer - Educational Codeforces Round 75 (Rated for Div. 2) [CF] D. Salary Changing - Educational Codeforces Round 75 (Rated for Div. 2) [CF] B. Two Cakes - Educational Codeforces Round 35 (Rated for Div. 2) [CF] C. Three Garlands - Educational Codeforces Round 35 (Rated for Div. 2) [CF] D. Inversion Counting - Educational Codeforces Round 35 (Rated for Div. 2) [CF] B. New Skateboard - Educational Codeforces Round 8 [CF] D. Magic Numbers - Educational Codeforces Round 8 [CF] D. Broken BST - Educational Codeforces Round 19 E. Array Queries - Educational Codeforces Round 19 C. Minimal string - Educational Codeforces Round 19 B. Odd sum - Educational Codeforces Round 19 B. Counting-out Rhyme - Educational Codeforces Round 18 C. Divide by Three - Educational Codeforces Round 18 D. Paths in a Complete Binary Tree - Educational Codeforces Round 18 A. Simple Palindrome - Codeforces Round 972 (Div. 2) A. Points on the line - Codeforces Round 466 (Div. 2) B. Our Tanya is Crying Out Loud - Codeforces Round 466 (Div. 2) C. Phone Numbers - Codeforces Round 466 (Div. 2) D. Alena And The Heater - Codeforces Round 466 (Div. 2) E. Cashback - Codeforces Round 466 (Div. 2) E. Water Taps - Educational Codeforces Round 40 C. Light Switches - Codeforces Round 963 (Div. 2) D. Med-imize - Codeforces Round 963 (Div. 2) E. Level Up - Educational Codeforces Round 168 D. Maximize the Root - Educational Codeforces Round 168 G. Penacony - Codeforces Round 962 (Div. 3) F. Bomb - Codeforces Round 962 (Div. 3) E. Decode - Codeforces Round 962 (Div. 3) D. Dense Subsequence - Intel Code Challenge Final Round C. Sonya and Problem Wihtout a Legend - Codeforces Round 371 (Div. 1) B. Searching Rectangles - Codeforces Round 371 (Div. 1) C. The Values You Can Make - Codeforces Round 360 (Div.1) E. Wooden Game - Codeforces Round 959 sponsored by NEAR (Div. 1 + Div. 2)