Leetcode 733. Flood Fill_综合

文章作者：Tyan
博客：noahsnail.com | CSDN | 简书

1. Description

Flood Fill

2. Solution

Version 1

class Solution {
public:vector<vector<int>> floodFill(vector<vector<int>>& image, int sr, int sc, int newColor) {int rows = image.size();int columns = image[0].size();vector<vector<int>> flag(rows, vector<int>(columns));int oldColor = image[sr][sc];floodFill(image, sr, sc, newColor, oldColor, rows, columns, flag);return image;}private:void floodFill(vector<vector<int>>& image, int sr, int sc, int& newColor, int& oldColor, int& rows, int& columns, vector<vector<int>>& flag) {if(sr < 0 || sr == rows || sc < 0 || sc == columns || image[sr][sc] != oldColor || flag[sr][sc]) {return;}image[sr][sc] = newColor;flag[sr][sc] = 1;floodFill(image, sr + 1, sc, newColor, oldColor, rows, columns, flag);floodFill(image, sr - 1, sc, newColor, oldColor, rows, columns, flag);floodFill(image, sr, sc + 1, newColor, oldColor, rows, columns, flag);floodFill(image, sr, sc - 1, newColor, oldColor, rows, columns, flag);}
};

Version 2

class Solution {
public:vector<vector<int>> floodFill(vector<vector<int>>& image, int sr, int sc, int newColor) {int rows = image.size();int columns = image[0].size();int oldColor = image[sr][sc];floodFill(image, sr, sc, newColor, oldColor, rows, columns);return image;}private:void floodFill(vector<vector<int>>& image, int sr, int sc, int& newColor, int& oldColor, int& rows, int& columns) {if(sr < 0 || sr == rows || sc < 0 || sc == columns || image[sr][sc] != oldColor || image[sr][sc] == newColor) {return;}image[sr][sc] = newColor;floodFill(image, sr + 1, sc, newColor, oldColor, rows, columns);floodFill(image, sr - 1, sc, newColor, oldColor, rows, columns);floodFill(image, sr, sc + 1, newColor, oldColor, rows, columns);floodFill(image, sr, sc - 1, newColor, oldColor, rows, columns);}
};

Reference

https://leetcode.com/problems/flood-fill/description/