Submission #3044667

---

Source Code Expand

import itertools
N=int(input())
S=input()
ans=0
L=dict()
R=dict()
for seq in itertools.product([0,1],repeat=N):
    T0=""
    T1=""
    T2=""
    T3=""
    for i in range(N):
        if seq[i]==0:
            T0+=S[i]
            T2+=S[-i-1]
        else:
            T1+=S[i]
            T3+=S[-i-1]
    a0=len(T0)
    a1=len(T1)
    a2=len(T2)
    a3=len(T3)
    L[(T0,T1)]=L.get((T0,T1),0)+1
    R[(T2,T3)]=R.get((T2,T3),0)+1
for tup in L:
    if tup in R:
        ans+=L[tup]*R[tup]
print(ans)

Submission Info

Judge Result