规范格式

leetcode/0695.Max-Area-of-Island/695. Max Area of Island.go

@@ -0,0 +1,42 @@
+package leetcode
+
+var dir = [][]int{
+	[]int{-1, 0},
+	[]int{0, 1},
+	[]int{1, 0},
+	[]int{0, -1},
+}
+
+func maxAreaOfIsland(grid [][]int) int {
+	res := 0
+	for i, row := range grid {
+		for j, col := range row {
+			if col == 0 {
+				continue
+			}
+			area := areaOfIsland(grid, i, j)
+			if area > res {
+				res = area
+			}
+		}
+	}
+	return res
+}
+
+func isInGrid(grid [][]int, x, y int) bool {
+	return x >= 0 && x < len(grid) && y >= 0 && y < len(grid[0])
+}
+
+func areaOfIsland(grid [][]int, x, y int) int {
+	if !isInGrid(grid, x, y) || grid[x][y] == 0 {
+		return 0
+	}
+	grid[x][y] = 0
+	total := 1
+	for i := 0; i < 4; i++ {
+		nx := x + dir[i][0]
+		ny := y + dir[i][1]
+		total += areaOfIsland(grid, nx, ny)
+	}
+	return total
+}