C - False Hope
D - General Weighted Max Matching
E - Sandwiches
D - President
Codeforces Round 354 (Div. 2) D. Theseus and labyrinth
Codeforces Round 357 (Div. 2) D. Gifts by the List
Educational Codeforces Round 16 E. Generate a String
Codeforces Round 361 (Div. 2) E. Mike and Geometry Problem
Codeforces Round 362 (Div. 1) C. PLEASE
Laser Tanks