1.int main()
{int n,c,c1,p;
c=n/10;
c1=n/100;
p=c1*10+c;
cout<<p;
}
2. int main()
{
int a,c,c1,c2;
cin>>a;
c=a%10;
c1=(a/10)%10;
c2=a/100;
if(c1==c1+c2)
cout<<"da";
else
cout<<"nu";
}
3.int main()
{
int a ,b,c,p,per=0,aria=0;
cin>>a>>b>>c;
per=a+b+c;
p=(a+b+c)/2;
aria=sqrt(p(p-a)(p-b)(p-c));
cout<<"aria"<<aria<<"perimetru"<<per;
}
4int main()
{
int a,b,aux;
cin>>a>>b;
aux=a;
a=b;
b=aux;
cout<<a<<b;
}