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Program.cs
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Program.cs
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using System;
namespace _01Matrix
{
class Program
{
static void Main(string[] args)
{
int[][] matrix = new int[][]
{
new int[]{0,0,0},
new int[]{0,1,1},
new int[]{1,0,1},
};
Console.WriteLine(UpdateMatrix_DFS(matrix));
}
static int[][] UpdateMatrix_DFS(int[][] matrix)
{
if (matrix.Length == 0 || matrix[0].Length == 0)
return matrix;
var res = new int[matrix.Length][];
for (int i = 0; i < res.Length; i++)
res[i] = new int[matrix[0].Length];
for (int x = 0; x < matrix.Length; x++)
{
for (int y = 0; y < matrix[0].Length; y++)
{
if (matrix[x][y] == 0) continue;
res[x][y] = DFS(matrix, res, x, y);
}
}
return res;
}
static int DFS(int[][] matrix, int[][] result, int x, int y)
{
if (matrix[x][y] == 0) return 0;
if (x > 0 && matrix[x - 1][y] == 0 || x < matrix.Length - 1 && matrix[x + 1][y] == 0)
return 1;
if (y > 0 && matrix[x][y - 1] == 0 || y < matrix[0].Length - 1 && matrix[x][y + 1] == 0)
return 1;
int min = int.MaxValue - 1;
if (x > 0 && result[x - 1][y] != 0)
min = Math.Min(min, result[x - 1][y]);
if (x < matrix.Length - 1)
min = Math.Min(min, DFS(matrix, result, x + 1, y));
if (y > 0 && result[x][y - 1] != 0)
min = Math.Min(min, result[x][y - 1]);
if (y < matrix[0].Length - 1)
min = Math.Min(min, DFS(matrix, result, x, y + 1));
return min + 1;
}
}
}