字符串反转

1 print(input()[::-1])

 1 #include<bits/stdc++.h>
 2 using namespace std;
 3 int main()
 4 {
 5     string s;
 6     while(cin.getline(s))
 7     {
 8         reverse(s.begin(),s.end());
 9         cout<<s<<endl;
10     }
11     return 0;
12 }

 1 #include<bits/stdc++.h>
 2 using namespace std;
 3 int main()
 4 {
 5     char ch;
 6     stack<char> ch_stack;
 7     while(cin>>ch)
 8     {
 9         ch_stack.push(ch);
10     }
11     while(!ch_stack.empty()) //美哉！
12     {
13         cout<<ch_stack.top();
14         ch_stack.pop();
15     }
16     return 0;
17 }

 1 #include<bits/stdc++>h>
 2 using namespace std;
 3 void helper()
 4 {
 5     char c;
 6     if(cin>>c)
 7     {
 8         helper();
 9         cout<<c;
10     }
11 }
12 int main()
13 {
14     hepler();
15 }