https://leetcode.com/problems/minimum-obstacle-removal-to-reach-corner/description/


Min removals to travel first-last in 2D grid #hard #bfs #dijkstra

https://leetcode.com/problems/minimum-time-to-visit-a-cell-in-a-grid/description/


Min time start-end 4-d travel in 2D matrix with waiting #hard #dijkstra

Count optimal paths from 0 to n - 1 #medium #dijkstra #bellman_ford

https://leetcode.com/problems/number-of-ways-to-arrive-at-destination/description/