Minimum Cost To Make At Least One Valid Path In A Grid
Modify signs in m x n grid to create a valid path from top-left to bottom-right using 0-1 BFS with deque & distance array, achieving min cost of O(m × n) time & space complexity.
1368. Minimum Cost to Make at Least One Valid Path in a Grid Difficulty: Hard Topics: Array, Breadth-First Search, Graph, Heap (Priority Queue), Matrix, Shortest Path Given an m x n grid. Each cell of the grid has a sign pointing to the next cell you should visit if you are currently in this cell. The sign of grid[i][j] can be: 1 which means go to the cell to the right. (i.e go from grid[i][j] to grid[i][j + 1]) 2 which means go to the cell to the left. (i.e go from grid[i][j] to grid[i][j - 1]) 3 which means go to the lower cell. (i.e go from grid[i][j] to grid[i + 1][j]) 4 which means go to...