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Max area of island#39

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ignacio-chiazzo merged 3 commits intomasterfrommaxAreaOfIsland
Oct 29, 2020
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52 changes: 52 additions & 0 deletionsLeetcodeProblems/Max_Area_Of_Island.js
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/*
Max Area of Island

Given a non-empty 2D array grid of 0's and 1's, an island is a group of 1's (representing land) connected 4-directionally (horizontal or vertical.) You may assume all four edges of the grid are surrounded by water.

Find the maximum area of an island in the given 2D array. (If there is no island, the maximum area is 0.)

Example 1:

[[0,0,1,0,0,0,0,1,0,0,0,0,0],
[0,0,0,0,0,0,0,1,1,1,0,0,0],
[0,1,1,0,1,0,0,0,0,0,0,0,0],
[0,1,0,0,1,1,0,0,1,0,1,0,0],
[0,1,0,0,1,1,0,0,1,1,1,0,0],
[0,0,0,0,0,0,0,0,0,0,1,0,0],
[0,0,0,0,0,0,0,1,1,1,0,0,0],
[0,0,0,0,0,0,0,1,1,0,0,0,0]]
Given the above grid, return 6. Note the answer is not 11, because the island must be connected 4-directionally.
Example 2:

[[0,0,0,0,0,0,0,0]]
Given the above grid, return 0.
Note: The length of each dimension in the given grid does not exceed 50.
*/

/**
* @param {number[][]} grid
* @return {number}
*/
var maxAreaOfIsland = function(grid) {
var maxArea = 0;

for(var i = 0; i < grid.length; i++) {
for(var j = 0; j < grid[0].length; j++) {
maxArea = Math.max(markIsland(i, j, grid), maxArea);
}
}

return maxArea;
};

var markIsland = function(row, col, grid) {
if(row < 0 || row >= grid.length || col < 0 || col >= grid[0].length || grid[row][col] == 0) {
return 0;
}

grid[row][col] = 0;
return 1 + markIsland(row + 1, col, grid) + markIsland(row - 1, col, grid)
+ markIsland(row, col +1, grid) + markIsland(row, col - 1, grid);
}

module.exports.maxAreaOfIsland = maxAreaOfIsland;
51 changes: 51 additions & 0 deletionsLeetcodeProblemsTests/Max_Area_Of_Island_Test.js
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const assert = require('assert');
const { maxAreaOfIsland } = require('../LeetcodeProblems/Max_Area_Of_Island');

function test1() {
var matrix = [
[0,0,1,0,0,0,0,1,0,0,0,0,0],
[0,0,0,0,0,0,0,1,1,1,0,0,0],
[0,1,1,0,1,0,0,0,0,0,0,0,0],
[0,1,0,0,1,1,0,0,1,0,1,0,0],
[0,1,0,0,1,1,0,0,1,1,1,0,0],
[0,0,0,0,0,0,0,0,0,0,1,0,0],
[0,0,0,0,0,0,0,1,1,1,0,0,0],
[0,0,0,0,0,0,0,1,1,0,0,0,0]
]

assert.strictEqual(maxAreaOfIsland(matrix), 6);
}

function test2() {
var matrix = [
[0, 1, 1, 0, 0],
[0, 1, 1, 0, 0],
[0, 0, 1, 0, 1],
[0, 1, 0, 0, 1],
[0, 1, 1, 0, 1],
[0, 0, 0, 0, 0],
]

assert.strictEqual(maxAreaOfIsland(matrix), 5);
}

function test3() {
var matrix = [
[0, 1, 0, 0, 0],
[0, 1, 1, 1, 1],
[0, 0, 0, 0, 1],
[0, 1, 1, 1, 1],
[0, 0, 1, 0, 0],
[0, 0, 0, 0, 0],
]

assert.strictEqual(maxAreaOfIsland(matrix), 11);
}

function test() {
test1();
test2();
test3();
}

module.exports.test = test
3 changes: 2 additions & 1 deletionREADME.md
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Expand Up@@ -36,7 +36,8 @@ To run a specific problem in your console, go to the file test, add the call to
| [Group Anagrams ](/LeetcodeProblems/Group_Anagrams.js) | Medium | https://leetcode.com/problems/group-anagrams/
| [Kth Largest Element in an Array ](/LeetcodeProblems/Kth_Largest_Element_in_an_Array.js) | Medium | https://leetcode.com/problems/kth-largest-element-in-an-array/ |
| [Linked List Cycle II ](/LeetcodeProblems/Linked_List_Cycle_II.js) | Medium | https://leetcode.com/problems/linked-list-cycle-ii/ |
| [Longest Palindromic Substring ](/LeetcodeProblems/Longest_Palindromic_Substring.js) | Medium | https://leetcode.com/problems/longest-palindromic-substring/ |
| [Longest Palindromic Substring ](/LeetcodeProblems/Longest_Palindromic_Substring.js) | Medium | https://leetcode.com/problems/longest-palindromic-substring/|
| [Max Area Of Island](https://leetcode.com/problems/max-area-of-island/) | Medium | https://leetcode.com/problems/max-area-of-island/ |
| [Maximal Square ](/LeetcodeProblems/Maximal_Square.js) | Medium | https://leetcode.com/problems/maximal-square/ |
| [Permutations ](/LeetcodeProblems/Permutations.js) | Medium | https://leetcode.com/problems/permutations/ |
| [Permutations II ](/LeetcodeProblems/Permutations_II.js) | Medium | https://leetcode.com/problems/permutations-ii/ |
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