200. Number of Islands

200. Number of IslandsMediumTopicsCompaniesGiven an m x n 2D binary grid grid which represents a map 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 all surrounded by water.

Given an m x n 2D binary grid grid which represents a map 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 all surrounded by water.

According to island biogeography, what is the relationship between an island's distance from the mainland and the number of species present on the island?

How many island countries are neighbours of India?

Given a 2D grid consists of 0s (land) and 1s (water). An island is a maximal 4-directionally connected group of 0s and a closed island is an island totally (all left, top, right, bottom) surrounded by 1s.Return the number of closed islands.Input FormatThe First line contains two integers denoting the value of n and mThe Next N lines contains M integers denoting the elements of the matrix.Constraints1 <= grid.length, grid[0].length <= 1000 <= grid[i][j] <=1Output FormatPrint a integer which is the answer to the question.Sample Input 03 50 0 1 0 00 1 0 1 00 1 1 1 0Sample Output 01Sample Input 13 41 0 1 1 1 1 1 1 1 1 1 1 Sample Output 10