Contest Name: 38761 - ready, set, 3tees. (16 hrs and 53 mins)

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Problem Name Online Judge Contest
1 P1 - You Are Given a Tree Codeforces Codeforces Round #507 (Div. 1, based on Olympiad of Metropolises)
2 P2 - Region Separation Codeforces Codeforces Round #511 (Div. 1) & Codeforces Round #511 (Div. 2)
3 P3 - Triple Flips Codeforces Technocup 2019 - Elimination Round 2
4 P4 - Sergey's problem Codeforces Codeforces Round #503 (by SIS, Div. 1) & Codeforces Round #503 (by SIS, Div. 2)
5 P5 - Concise and clear Codeforces Codeforces Round #491 (Div. 2)
6 P6 - Cowmpany Cowmpensation Codeforces Codeforces Round #492 (Div. 1) [Thanks, uDebug!]
7 P7 - Sky Full of Stars Codeforces Codeforces Round #493 (Div. 1) & Codeforces Round #493 (Div. 2)
8 P8 - Cycles in product Codeforces Codeforces Round #493 (Div. 1)
9 P9 - Sonya and Bitwise OR Codeforces Codeforces Round #495 (Div. 2)
10 P10 - Store Codeforces Codeforces Round #499 (Div. 1)
11 P11 - AB-Strings Codeforces Codeforces Round #500 (Div. 1) [based on EJOI] & Codeforces Round #500 (Div. 2) [based on EJOI]
12 P12 - Kuro and Topological Parity Codeforces Codeforces Round #482 (Div. 2)