Created
August 8, 2019 21:28
-
-
Save myf/02d3a2b57c04f8826716337307a7b854 to your computer and use it in GitHub Desktop.
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
const scan = (mat) => { | |
let islands = 0; | |
for (let x = 0; x < mat.length; x++) { | |
for (let y = 0; y < mat[0].length; y++) { | |
/* | |
for (let x = mat.length - 1; x >= 0 ; x--) { | |
for (let y = mat[0].length -1; y >= 0 ; y--) { | |
*/ | |
if (mat[x][y] === 1) { | |
islands ++; | |
flood(mat, x, y, 1, 0); | |
console.log(mat); | |
} | |
} | |
} | |
return islands; | |
}; | |
const flood = (mat, i, j, orig, newc) => { | |
// base case | |
if (i < 0 || | |
j < 0 || | |
i >= mat.length || | |
j >= mat[0].length) { | |
return; | |
} | |
if (mat[i][j] === orig) { | |
mat[i][j] = newc; | |
flood(mat, i + 1, j, orig, newc); | |
flood(mat, i - 1, j, orig, newc); | |
flood(mat, i, j + 1, orig, newc); | |
flood(mat, i, j - 1, orig, newc); | |
} | |
}; | |
var mat = [[0,1,1,1,0], | |
[1,1,0,0,0], | |
[0,0,0,1,1]]; | |
console.log(scan(mat)); |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment