câu 5:

#include <bits/stdc++.h>
using namespace std;
string s,saveStr;
void cauA(){
	saveStr=s;
	reverse(s.begin(),s.end());
	cout<<s<<"\n";
}
void cauB(){
	if(saveStr==s)cout<<"yes";
	else cout<<"no";
}
signed main() {
	cin>>s;
	cauA();
	cauB();
}

câu 6:

#include <bits/stdc++.h>
using namespace std;
#define int long long 
int n;
signed main() {
	cin>>n;
	int saveN=0,compareN=n;
	while(n){
		saveN=saveN*10+n%10;
		n/=10;
	}
	if(saveN==compareN){
		cout<<"1";
	}
	else cout<<"0";
}