https://leetcode.com/problems/open-the-lock/description/

Steps to rotate 4-wheel 0000 -> target #medium #bfs #deque

https://leetcode.com/problems/find-the-safest-path-in-a-grid/description/

Safest path in a grid with thiefs #medium #bfs #heap

https://leetcode.com/problems/find-the-city-with-the-smallest-number-of-neighbors-at-a-threshold-distance/description/

Node with minimum neighbours by distanceThreshold #medium #bfs #FloydWarshall