bài 5
#include<bits/stdc++.h>
using namespace std;
int main()
{
int n;
cin>>n;
int a[n];
for (int i=0;i<n;i++)
cin>>a[i];
sort(a,a+n);
for (int i=n-2;i>=0;i--)
{
if (a[i]!=a[n-1])
cout<<a[i]*a[n-1],exit(0);
}
}
bài 6
#include<bits/stdc++.h>
using namespace std;
int main(){
string s;
getline(cin,s);
if (s[0]>='a'&&s[0]<='z')
{
s[0]=s[0]-32;
cout<<s[0];
}else if (s[0]>='A'&&s[0]<='Z') cout<<s[0];
for (int i=1;i<s.length();i++)
{
if (s[i]>='a'&&s[i]<='z'&&s[i-1]==' ') s[i]=s[i]-32;
if (s[i]==' '&&s[i-1]==' ') {
continue;
}
if (s[i]>='A'&&s[i]<='Z'&&s[i-1]!=' ') s[i]=s[i]+32;
cout<<s[i];
}
}
