Python C++ hash set解Leetcode 1496 Path Crossing

Python C++ hash set解Leetcode 1496  Path Crossing

[codes on Leetcode]https://leetcode.com/problems/path-crossing/solutions/4443633/c-hash-set-over-int-is-enough-python-0ms-beats-100/

[Leetcode playList]https://www.youtube.com/watch?v=0iFR8nafMWE&list=PLYRlUBnWnd5IdDHk2BjqXwesydU17z_xk