B - Plus and AND
D - I Hate Non-integer Number
D - Left Right Operation
D - Flipping and Bonus
Codeforces Round #561 (Div. 2) C. A Tale of Two Lands
Educational Codeforces Round 65 (Rated for Div. 2) D. Bicolored RBS
Educational Codeforces Round 134 (Rated for Div. 2) C. Min-Max Array Transformation
Codeforces Round #814 (Div. 2) C. Fighting Tournament
Codeforces Round #817 (Div. 4) G. Even-Odd XOR
E - Warp