编写题解 1209: 密码截获

解题思路:

注意事项:

参考代码:

while True:
    try:
        st=input()
        ts=st[::-1]
        s=[]
        l=len(st)
        if l==1:
            print(1)
            continue
        for i in range(l):
            for j in range(l-1,i,-1):
                if st[i]==st[j]:
                    if st[i:j+1]==st[i:j+1][::-1]:
                        s.append(j-i+1)
                        break
                if ts[i]==ts[j]:
                    if ts[i:j+1]==ts[i:j+1][::-1]:
                        s.append(j-i+1)
                        break
        print(max(s))      
    except:
        break