F - Exactly K Steps
C - Min Diff Sum
Codeforces Round #375 (Div. 2) C. Polycarp at the Radio
Codeforces Round #375 (Div. 2) D. Lakes in Berland
Canada Cup 2016 C. Hidden Word
Technocup 2017 - Elimination Round 1 (Unofficially Open for Everyone, Rated for Div. 2) B. Bill Total Value
2016-2017 ACM-ICPC, NEERC, Southern Subregional Contest (Online Mirror, ACM-ICPC Rules, Teams Preferred) G. Car Repair Shop
Doom Bakes Cakes
Fenwick Iterations
OR of ANDs