Save Beta Rabbit | Python Fiddle

food = 5
grid = [[0, 2, 5], [1, 1, 3], [2, 1, 1]]

n = len(grid) - 1
rooms = n + n
last_zombie = grid[n][n]
results = []
results.append(food)
print "Array row %s, col %s" % (n,n)
def enter(x, y, remaining_food):
    #check all four adjacent cells
    
    # if results[0] == 0:
    #	return
    
    if x == y and y == n:
        print remaining_food
        if remaining_food < results[0]:
            results[0] = remaining_food
        return
    print "Checking row %s, column %s on %s with %s food" % (x,y, grid, remaining_food)
    zombie_hunger = grid[x][y]
    if zombie_hunger <= remaining_food:
    	remaining_food -= zombie_hunger
        # Last Room Condition
        
        # end of path conditions
        rooms_remaining = rooms - x - y - 1
        if results[0] != 0 and remaining_food >= rooms_remaining:
            if x < n:
                enter(x + 1, y, remaining_food)
            if y < n and results[0] != 0:
                enter(x, y + 1, remaining_food)
        else:
            print "Ending Early"
    return
enter(0, 0, food-last_zombie)
print results[0]

Browser Version Not Supported

Due to Python Fiddle's reliance on advanced JavaScript techniques, older browsers might have problems running it correctly. Please download the latest version of your favourite browser.
Chrome 10+ Firefox 4+ Safari 5+
IE 10+

Let me try anyway!

Python Fiddle

Python Cloud IDE