1s Surrounded by 0s. GFG POTD

Given an n × m binary matrix grid[][], find the total count of all cells containing 1 that are unable to move out of the grid through a path of adjacent 1s.

Adjacency means you can only move in four directions: Up, Down, Left, and Right. Diagonal moves are not allowed.
Assume that the space immediately outside the grid is an open path. Any 1 located directly on the outer boundary of the grid (first row, last row, first column, or last column) can immediately step out, and any 1 connected to it can follow and also step out of the grid.

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https://www.geeksforgeeks.org/problems/1s-surrounded-by-0s/1

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