Problem: Snuke, who loves animals, built a zoo.  There are N animals in this zoo. They are conveniently numbered 1 through N, and arranged in a circle. The animal numbered i (2≤i≤N-1) is adjacent to the animals numbered i-1 and i+1. Also, the animal numbered 1 is adjacent to the animals numbered 2 and N, and the animal numbered N is adjacent to the animals numbered N-1 and 1.  There are two kinds of animals in this zoo: honest sheep that only speak the truth, and lying wolves that only tell lies.  Snuke cannot tell the difference between these two species, and asked each animal the following question: "Are your neighbors of the same species?" The animal numbered i answered s_i. Here, if s_i is `o`, the animal said that the two neighboring animals are of the same species, and if s_i is `x`, the animal said that the two neighboring animals are of different species.  More formally, a sheep answered `o` if the two neighboring animals are both sheep or both wolves, and answered `x` otherwise. Similarly, a wolf answered `x` if the two neighboring animals are both sheep or both wolves, and answered `o` otherwise.  Snuke is wondering whether there is a valid assignment of species to the animals that is consistent with these responses. If there is such an assignment, show one such assignment. Otherwise, print `-1`.

Submission attempts (in order):
n=int(input())
w1=list(input())
s="S"
w="W"
o="o"
x="x"
l=[[s,s],[s,w],[w,w],[w,s]]
for j in range(4):
    for i in range(1,n):
        if w1[i]==o:
            if l[j][-1]==s:
                if l[j][-2]==s:
                    l[j].append(s)
                else:
                    l[j].append(w)
            else:
                if l[j][-2]==s:
                    l[j].append(w)
                else:
                    l[j].append(s)
        else:
            if l[j][-1]==s:
                if l[j][-2]==s:
                    l[j].append(w)
                else:
                    l[j].append(s)
            else:
                if l[j][-2]==s:
                    l[j].append(s)
                else:
                    l[j].append(w)
b=False
for i in range(4):
  if l[i][0]==l[i][-1] and not b:
    del l[i][-1]
    if (l[i][1]==l[i][-1] and w[0]==o) or (l[i][1]!=l[i][-1] and w[0]==x):
      answer=l[i]
      b=True
      break
if not b:
    print(-1)
else:
    print("".join(answer))

print(-1)

n=int(input())
w1=list(input())
s="S"
w="W"
o="o"
x="x"
l=[[s,s],[s,w],[w,w],[w,s]]
for j in range(4):
    for i in range(1,n):
        if w1[i]==o:
            if l[j][-1]==s:
                if l[j][-2]==s:
                    l[j].append(s)
                else:
                    l[j].append(w)
            else:
                if l[j][-2]==s:
                    l[j].append(w)
                else:
                    l[j].append(s)
        else:
            if l[j][-1]==s:
                if l[j][-2]==s:
                    l[j].append(w)
                else:
                    l[j].append(s)
            else:
                if l[j][-2]==s:
                    l[j].append(s)
                else:
                    l[j].append(w)
b=False
for i in range(4):
  if l[i][0]==l[i][-1] and not b:
    del l[i][-1]
    if l[i][0]==s:
      if (l[i][1]==l[i][-1] and w1[0]==o) or (l[i][1]!=l[i][-1] and w1[0]==x):
        answer=l[i]
        b=True
        break
    else:
      if (l[i][1]!=l[i][-1] and w1[0]==o) or (l[i][1]==l[i][-1] and w1[0]==x):
        answer=l[i]
        b=True
        break
if not b:
    print(-1)
else:
    print("".join(answer))

Verdicts: Wrong Answer

Wrong Answer

Accepted