InterviewBit Problems   City Tour : Solved

About the City Tour : Solved category (1)
Gilad Python Solution (1)
Python Solution using itertools (1)
[Python] Combinatorics (1)
C++ Solution....Combinatorics (4)
Can Someone explain the solution clearly? (3)
Explanation of Solution Approach (2)
C++ solution combinatorics (3)
C++ O(n) Solution....error!?! (1)
Frustration 100 alert! (2)
Solution working for all test cases , silly mistake , suggest changes (1)
Same Question, Codeforces (1)
C++ solution working for smaller inputs but exceeding time limit for larger inputs (1)
Not able to understand the formula used(The combinations part) (1)
Unable to understand the exact logic (2)
My commented solution (1)
Can somebody please explain the solution (1)
Unable to understand editorial (1)