Robotti

a = int(input())

b = []

for i in range(a):
    b.append([])
    c=input()
    for j in range(a):
        b[i].append(c[j])

d=0
e=0
f=3
g=0
while True:
    if b[d][e]==".":
        if f==3:
            d+=1
        elif f==1:
            d-=1
        elif f==2:
            e+=1
        elif f==4:
            e-=1
    elif b[d][e]=="/":
        b[d][e]="\\"
        if f==3:
            e-=1
            f=4
        elif f==1:
            e+=1
            f=2
        elif f==2:
           d-=1
           f=1
        elif f==4:
            d+=1
            f=3
    elif b[d][e]=="\\":
        b[d][e]="/"
        if f==3:
            e+=1
            f=2
        elif f==1:
            e-=1
            f=4
        elif f==2:
           d+=1
           f=3
        elif f==4:
            d-=1
            f=1
    g+=1
    if d<0:
        break
    if d>a-1:
        break
    if e<0:
        break
    if e>a-1:
        break
print(g)

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