Rotten oranges

from collections import deque

class Solution:
    def orangesRotting(self, grid):
        q = deque()
        row, col = len(grid), len(grid[0])
        check = [[False for _ in range(col)] for _ in range(row)]
        total_fresh = 0
        ans = 0

        for i in range(row):
            for j in range(col):
                if grid[i][j] == 2:
                    q.append((i, j))
                    check[i][j] = True
                if grid[i][j] == 1:
                    total_fresh += 1

        while len(q) and total_fresh:
            k = len(q)
            x = [-1, 0, 1, 0]
            y = [0, 1, 0, -1]

            for i in range(k):
                temp = q[0]
                q.popleft()

                for k in range(4):
                    new_x = temp[0] + x[k]
                    new_y = temp[1] + y[k]

                    if (new_x >= 0 and new_y >= 0 and new_x < row and new_y < col
                        and grid[new_x][new_y] == 1 and not check[new_x][new_y]):
                        q.append((new_x, new_y))
                        check[new_x][new_y] = True
                        total_fresh -= 1

            ans += 1

        if total_fresh != 0:
            return -1
        return ans