把字母抠下来
class Solution { public: string reverseOnlyLetters(string S) { string t; for(int i = 0;i<S.size();i++) { if(isalpha(S[i])) { t.push_back(S[i]); } } reverse(t.begin(),t.end()); int j = 0; for(int i = 0;i<S.size();i++) { if(isalpha(S[i])) S[i] = t[j++]; } return S; } };
