Solutions with explanation and C++ code of these contests are available here.
All these solutions and editorials are published after the actual contest gets over and are only aimed for editorial purposes.
Codeforces Rounds-
Global Rounds-
1. Codeforces Global Round 18
(Solutions) (Contest Link)
Educational Rounds
1. Codeforces Educational Round 120 (Solutions) (Contest Link)Other Rounds-
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