QXO | Staff Software Engineer (Staff) | Coding | Phone Screen

// Given an m x n 2D grid of '1's (land) and '0's (water), return the number of islands. // An island is surrounded by water and is formed by connecting adjacent lands horizontally or vertically. // You may assume all four edges of the grid are surrounded by water. // Example usage: // char[][] grid = { // {'1','1','0','0','0'}, // {'1','1','0','0','0'}, // {'0','0','1','0','0'}, // {'0','0','0','1','1'} // }; // num...