E - Traveler
Codeforces Round #386 (Div. 2) D. Green and Black Tea
Technocup 2017 - Elimination Round 3 B. Santa Claus and Keyboard Check
Codeforces Round #388 (Div. 2) C. Voting
Codeforces Round #393 (Div. 2) (8VC Venture Cup 2017 - Final Round Div. 2 Edition) B. Frodo and pillows
Codeforces Round #394 (Div. 2) C. Dasha and Password
Kth Permutation Sequence
All Unique Permutations
Trailing Zeros in Factorial
Grid Unique Paths