Making A Large Island

arraydepth-first searchbreadth-first search

You are given an n x n binary matrix grid . You are allowed to change at most one 0 to be 1 .

Return the size of the largest island in grid after applying this operation .

An island is a 4-directionally connected group of 1 s.

Example 1

Input: grid = [[1,0],[0,1]]
Output: 3
Change one 0 to 1 and connect two 1s, then we get an island with area = 3.

Example 2

Input: grid = [[1,1],[1,0]]
Output: 4
Change the 0 to 1 and make the island bigger, only one island with area = 4.

Example 3

Input: grid = [[1,1],[1,1]]
Output: 4
Can't change any 0 to 1, only one island with area = 4.

n == grid.length

n == grid[i].length

1 <= n <= 500

grid[i][j] is either 0 or 1 .

😤

Hard

Difficulty

Topic Info

ModuleDSA

CategoryArray

Sub-topicDepth-First Search