package q04

func waterCorners(grid [][]rune, x, y int) int {
	isWater := func(x, y int) int {
		if x < 0 || y < 0 || x >= len(grid) || y >= len(grid[x]) || grid[x][y] == ' ' {
			return 1
		}
		return 0
	}
	return isWater(x-1, y) + isWater(x+1, y) + isWater(x, y-1) + isWater(x, y+1)
}

func solveP1(grid [][]rune) int {
	var ps int
	for x := range grid {
		for y := range grid[x] {
			if waterCorners(grid, x, y) == 3 {
				ps++
			}
		}
	}
	return ps
}