题解 | #数组逆置#直接调用库函数

//C++版代码
#include <iostream>
#include <algorithm>
using namespace std;
int main() {
    string s;
    cin >> s;
    reverse(s.begin(), s.end());
    cout << s;
    return 0;
}
//Java版代码
import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        StringBuilder sb = new StringBuilder(sc.next());
        System.out.println(sb.reverse());
    }
}
#Python版代码
print(input()[::-1])