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- Educational Codeforces Round 10. D. Nested Segments: c++, perl and common lisp implementation, Segment Tree
- Codeforces Round #356 (Div. 2) C. Bear and Prime 100
- Codeforces Round #353 (Div. 2) C. Money Transfers
- Codeforces Round #354 (Div. 2) C. Vasya and String
- Codeforces Round #345 (Div. 2) Problem B
- CodeForces 239A. Triangle
- codeforces A. Difference Row
- codeforces B.Fixed Points
- codeforces Simple Molecules
- codeforces Magnets
- codeforces Expecting Trouble
- codeforces 199a
- codeforces 340C Tourist Problem
- cf340D Bubble Sort Graph
- codeforces mysterious present 最长上升子序列+倒序打印路径
- codeforces298c
- codeforces194b
- codeforces194a
- codeforces195c
- codeforces195a
- codefoces round193a
- codeforces 192e
- abbyy cup a
- codeforces 192a
- codeforces 192b
- codeforces 192 c
- codeforces 192 D
- codeforces magic five －－快速幂模
- codeforces hungry sequence 水题
- Codeforces Flipping game 动态规划基础
- Testing Round #8 A. IQ Test 水题
- Codeforces Testing Round #8 B. Sheldon and Ice Pieces 水题
- Codeforces Round #190 (Div. 2) B. Ciel and Flowers
- Codeforces Round #187 (Div. 2) B. Sereja and Array
- Codeforces Round #187 (Div. 2) A. Sereja and Bottles
- Codeforces Round #185 (Div. 2) B. Archer
- Codeforces Round #186 (Div. 2) C. Ilya and Matrix
- Codeforces Round #185 (Div. 1) A. The Closest Pair
- CF 281A Word Capitalization
- CF 142B T-primes
- CF 230A Dragons
- CF 231A Team
- CF271 C. Secret
- CF271 A. Beautiful Year
- CF271 B. Prime Matrix
- CF266 B. Queue at the School
- CF266 A. Stones on the Table
- CodeForce 264 A. Escape from Stones
- A. Roma and Lucky Numbers