Merge branch 'master' into unique-paths

Author: ignacio-chiazzo

FloodFill.js

@@ -0,0 +1,59 @@
+/*
+https://leetcode.com/problems/flood-fill/description/
+
+An image is represented by a 2-D array of integers, each integer representing the pixel value of the image (from 0 to 65535).
+
+Given a coordinate (sr, sc) representing the starting pixel (row and column) of the flood fill, and a pixel value newColor, "flood fill" the image.
+
+To perform a "flood fill", consider the starting pixel, plus any pixels connected 4-directionally to the starting pixel of the same color as the starting pixel, plus any pixels connected 4-directionally to those pixels (also with the same color as the starting pixel), and so on. Replace the color of all of the aforementioned pixels with the newColor.
+
+At the end, return the modified image.
+
+Example 1:
+Input: 
+image = [[1,1,1],[1,1,0],[1,0,1]]
+sr = 1, sc = 1, newColor = 2
+Output: [[2,2,2],[2,2,0],[2,0,1]]
+Explanation: 
+From the center of the image (with position (sr, sc) = (1, 1)), all pixels connected 
+by a path of the same color as the starting pixel are colored with the new color.
+Note the bottom corner is not colored 2, because it is not 4-directionally connected
+to the starting pixel.
+Note:
+
+The length of image and image[0] will be in the range [1, 50].
+The given starting pixel will satisfy 0 <= sr < image.length and 0 <= sc < image[0].length.
+The value of each color in image[i][j] and newColor will be an integer in [0, 65535].
+
+*/
+
+var floodFill = function(image, sr, sc, newColor) {
+  var oldColor = image[sr][sc];
+  
+  if(newColor == oldColor) {
+      return image;
+  }
+  
+  image[sr][sc] = newColor;
+  
+  if(sr > 0 && image[sr - 1][sc] == oldColor) {
+      floodFill(image, sr - 1, sc, newColor);    //Left
+  }
+  if(sc > 0 && image[sr][sc - 1] == oldColor) {
+      floodFill(image, sr, sc - 1, newColor);   //Up
+  }
+  if(sr < image.length - 1 && image[sr + 1][sc] == oldColor) {
+      floodFill(image, sr + 1, sc, newColor);    //Down
+  }
+  if(sc < image[0].length - 1 && image[sr][sc + 1] == oldColor) {
+      floodFill(image, sr, sc + 1, newColor);    // Right
+  }
+  return image;
+};
+
+
+function main() {
+  console.log(floodFill([[1,1,1],[1,1,0],[1,0,1]], 1, 1, 2))
+}
+
+module.exports.main = main;

Main.js

@@ -3,10 +3,12 @@ var permutationWithoutDuplicates = require("./PermutationsWithoutDuplicates.js")
 var permutationWithDuplicates = require("./PermutationsWithDuplicates.js");
 var subsets = require("./Subsets.js");
 var uniquePaths = require("./UniquePaths.js");
+var floodFill = require("./FloodFill.js")
 
 // Invocation
 
 // permutationWithoutDuplicates.main();
 // permutationWithDuplicates.main();
 // subsets.main();
-// uniquePaths.main();
+// uniquePaths.main();
+// floodFill.main();