80分求助

#include<bits/stdc++.h>
using namespace std;
int main(){
    string s;
    cin >> s;
    if(s == "0"){
        cout << 0 << endl;
        return 0;
    }
    if(s[0] == '-'){
        cout<<"-";
        if(s[s.size()-1] == '0'){
            for(int i = s.size() - 2;i >= 1;i--){
                cout << s[i];
            }
            cout << endl;
        }
        else{
            for(int i = s.size() - 1;i >= 1;i--){
                cout << s[i];
            }
            cout << endl;
        }
    }
    else{
        if(s[s.size()-1] == '0'){
            for(int i = s.size() - 2;i >= 0;i--){
                cout << s[i];
            }
            cout << endl;
        }
        else{
            for(int i = s.size() - 1;i >= 0;i--){
                cout << s[i];
            }
            cout << endl;
        }
    }
}