发帖原因见标题，废话不说上代码：

#include <bits/stdc++.h>
using namespace std;

string s,s1;

string a(string s2){
	return s2.substr(1);
}
int main(){
	cin>>s;
	if(s[0]=='-'){
		cout<<"-";
		s1=a(s);
	}
	reverse(s1.begin(), s1.end());
	if(s1[0]=='0'){
		string s3;
		s3=a(s1);
		cout<<s3;
		return 0;
	}
	cout<<s1;
	return 0;
}
//reverse(str.begin(), str.end());