Merge pull request #211 from gostool/leetcode1034

Leetcode1034

leetcode/1034.Coloring-A-Border/1034.Coloring A Border.go

@@ -0,0 +1,50 @@
+package leetcode
+
+type point struct {
+	x int
+	y int
+}
+
+type gridInfo struct {
+	m             int
+	n             int
+	grid          [][]int
+	originalColor int
+}
+
+func colorBorder(grid [][]int, row, col, color int) [][]int {
+	m, n := len(grid), len(grid[0])
+	dirs := []point{{1, 0}, {-1, 0}, {0, 1}, {0, -1}}
+	vis := make([][]bool, m)
+	for i := range vis {
+		vis[i] = make([]bool, n)
+	}
+	var borders []point
+	gInfo := gridInfo{
+		m:             m,
+		n:             n,
+		grid:          grid,
+		originalColor: grid[row][col],
+	}
+	dfs(row, col, gInfo, dirs, vis, &borders)
+	for _, p := range borders {
+		grid[p.x][p.y] = color
+	}
+	return grid
+}
+
+func dfs(x, y int, gInfo gridInfo, dirs []point, vis [][]bool, borders *[]point) {
+	vis[x][y] = true
+	isBorder := false
+	for _, dir := range dirs {
+		nx, ny := x+dir.x, y+dir.y
+		if !(0 <= nx && nx < gInfo.m && 0 <= ny && ny < gInfo.n && gInfo.grid[nx][ny] == gInfo.originalColor) {
+			isBorder = true
+		} else if !vis[nx][ny] {
+			dfs(nx, ny, gInfo, dirs, vis, borders)
+		}
+	}
+	if isBorder {
+		*borders = append(*borders, point{x, y})
+	}
+}

leetcode/1034.Coloring-A-Border/1034.Coloring A Border_test.go

@@ -0,0 +1,53 @@
+package leetcode
+
+import (
+	"fmt"
+	"testing"
+)
+
+type question1034 struct {
+	para1034
+	ans1034
+}
+
+// para 是参数
+type para1034 struct {
+	grid  [][]int
+	row   int
+	col   int
+	color int
+}
+
+// ans 是答案
+type ans1034 struct {
+	ans [][]int
+}
+
+func Test_Problem1034(t *testing.T) {
+
+	qs := []question1034{
+
+		{
+			para1034{[][]int{{1, 1}, {1, 2}}, 0, 0, 3},
+			ans1034{[][]int{{3, 3}, {3, 2}}},
+		},
+
+		{
+			para1034{[][]int{{1, 2, 2}, {2, 3, 2}}, 0, 1, 3},
+			ans1034{[][]int{{1, 3, 3}, {2, 3, 3}}},
+		},
+
+		{
+			para1034{[][]int{{1, 1, 1}, {1, 1, 1}, {1, 1, 1}}, 1, 1, 2},
+			ans1034{[][]int{{2, 2, 2}, {2, 1, 2}, {2, 2, 2}}},
+		},
+	}
+
+	fmt.Printf("------------------------Leetcode Problem 1034------------------------\n")
+
+	for _, q := range qs {
+		_, p := q.ans1034, q.para1034
+		fmt.Printf("【input】:%v    【output】:%v\n", p, colorBorder(p.grid, p.row, p.col, p.color))
+	}
+	fmt.Printf("\n\n\n")
+}

leetcode/1034.Coloring-A-Border/README.md

@@ -0,0 +1,108 @@
+# [1034. Coloring A Border](https://leetcode-cn.com/problems/coloring-a-border/)
+
+## 题目
+
+You are given an m x n integer matrix grid, and three integers row, col, and color. Each value in the grid represents the color of the grid square at that location.
+
+Two squares belong to the same connected component if they have the same color and are next to each other in any of the 4 directions.
+
+The border of a connected component is all the squares in the connected component that are either 4-directionally adjacent to a square not in the component, or on the boundary of the grid (the first or last row or column).
+
+You should color the border of the connected component that contains the square grid[row][col] with color.
+
+Return the final grid.
+
+**Example 1**:
+
+    Input: grid = [[1,1],[1,2]], row = 0, col = 0, color = 3
+    Output: [[3,3],[3,2]]
+
+**Example 2**:
+
+    Input: grid = [[1,2,2],[2,3,2]], row = 0, col = 1, color = 3
+    Output: [[1,3,3],[2,3,3]]
+
+**Example 3**:
+
+    Input: grid = [[1,1,1],[1,1,1],[1,1,1]], row = 1, col = 1, color = 2
+    Output: [[2,2,2],[2,1,2],[2,2,2]]
+
+**Constraints:**
+
+- m == grid.length
+- n == grid[i].length
+- 1 <= m, n <= 50
+- 1 <= grid[i][j], color <= 1000
+- 0 <= row < m
+- 0 <= col < n
+
+## 题目大意
+
+给你一个大小为 m x n 的整数矩阵 grid ，表示一个网格。另给你三个整数 row、col 和 color 。网格中的每个值表示该位置处的网格块的颜色。
+
+当两个网格块的颜色相同，而且在四个方向中任意一个方向上相邻时，它们属于同一连通分量
+
+边界：在连通分量的块中（前提）并且满足以下条件之一：
+（1）要么上下左右存在一个块不在连通分量里面
+（2）要么这个块的位置在整个grid的边框上
+
+请你使用指定颜色 color 为所有包含网格块 grid[row][col] 的连通分量的边界进行着色，并返回最终的网格 grid 。
+
+## 解题思路
+
+- 用bfs进行遍历选出边界，使用color给边界着色
+
+## 代码
+
+```go
+package leetcode
+
+type point struct {
+	x int
+	y int
+}
+
+type gridInfo struct {
+	m             int
+	n             int
+	grid          [][]int
+	originalColor int
+}
+
+func colorBorder(grid [][]int, row, col, color int) [][]int {
+	m, n := len(grid), len(grid[0])
+	dirs := []point{{1, 0}, {-1, 0}, {0, 1}, {0, -1}}
+	vis := make([][]bool, m)
+	for i := range vis {
+		vis[i] = make([]bool, n)
+	}
+	var borders []point
+	gInfo := gridInfo{
+		m:             m,
+		n:             n,
+		grid:          grid,
+		originalColor: grid[row][col],
+	}
+	dfs(row, col, gInfo, dirs, vis, &borders)
+	for _, p := range borders {
+		grid[p.x][p.y] = color
+	}
+	return grid
+}
+
+func dfs(x, y int, gInfo gridInfo, dirs []point, vis [][]bool, borders *[]point) {
+	vis[x][y] = true
+	isBorder := false
+	for _, dir := range dirs {
+		nx, ny := x+dir.x, y+dir.y
+		if !(0 <= nx && nx < gInfo.m && 0 <= ny && ny < gInfo.n && gInfo.grid[nx][ny] == gInfo.originalColor) {
+			isBorder = true
+		} else if !vis[nx][ny] {
+			dfs(nx, ny, gInfo, dirs, vis, borders)
+		}
+	}
+	if isBorder {
+		*borders = append(*borders, point{x, y})
+	}
+}
+```