//采用引用的方式，所以做一个swap function #include<bits/stdc++.h> using namespace std; void swap(string &s) { int len = s.length(); for (int i = 0; i < len/2; i++) { char temp = s[len - i - 1]; s[len - i - 1] = s[i]; s[i] = temp; } }

int main(){ string s; getline(cin,s); // write your code here...... swap(s); cout<<s; return 0; } //不采用引用的话,用reverse即可 #include<bits/stdc++.h> using namespace std; int main(){ string s; getline(cin,s); // write your code here...... reverse(s.begin(),s.end()); cout<<s; return 0; }