Robotti

grid_size = int(input())

grid = []
for x in range(grid_size):
    grid.append(list(input()))


robot_x = 0
robot_y = 0

step_count = 1
direction = "down"

while True:
    char = grid[robot_y][robot_x]

    if char == ".":
        if direction == "down":
            robot_y = robot_y + 1
        elif direction == "up":
            robot_y = robot_y - 1
        elif direction == "right":
            robot_x = robot_x + 1
        elif direction == "left":
            robot_x = robot_x - 1
    elif char == "/":
        # flip the char
        grid[robot_y][robot_x] = "\\"

        if direction == "down":
            robot_x = robot_x - 1
            direction = "left"
        elif direction == "up":
            robot_x = robot_x + 1
            direction = "right"
        elif direction == "right":
            robot_y = robot_y - 1
            direction = "up"
        elif direction == "left":
            robot_y = robot_y + 1
            direction = "down"
    elif char == "\\":
        # flip the char
        grid[robot_y][robot_x] = "/"

        if direction == "down":
            robot_x = robot_x + 1
            direction = "right"
        elif direction == "up":
            robot_x = robot_x - 1
            direction = "left"
        elif direction == "right":
            robot_y = robot_y + 1
            direction = "down"
        elif direction == "left":
            robot_y = robot_y - 1
            direction = "up"
    
    if robot_x >= grid_size or robot_x < 0 or robot_y >= grid_size or robot_y < 0:
        break

    step_count = step_count + 1

print(step_count)

Test 1 (public)

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED