Codeforces Round 1090 (Div. 4) Screencast + Upsolving (Problems A to G)

Solving and explaining problems (A, B, C, D, E, F, G) in Codeforces Round 1090 (Div. 4) Hope you learned from it! Chapters: 00:00 A - The 67th Integer Problem 01:18 (First try) B - The 67th 6-7 Integer Problem 03:50 C - The 67th Permutation Problem 07:24 (Second try) B - The 67th 6-7 Integer Problem 08:43 D - The 67th OEIS Problem 14:21 E - The 67th XOR Problem 19:16 F - The 67th Tree Problem 43:41 G - The 67th Iteration of "Counting is Fun" 1:45:55 (Upsolve) A - The 67th Integer Problem 1:46:57 (Upsolve) B - The 67th 6-7 Integer Problem 1:47:26 (Upsolve) C - The 67th Permutation Problem 1:50:11 (Upsolve) D - The 67th OEIS Problem 1:52:08 (Upsolve) E - The 67th XOR Problem 1:54:30 (Upsolve) F - The 67th Tree Problem 2:00:13 (Upsolve) G - The 67th Iteration of "Counting is Fun"