#include <iostream>
using namespace std;
int main() {
    int x,y;char op ;
    cin>>x>>y>>op;
    
    if(op=='+') cout<<x+y;
    else if(op=='-') cout<<x-y;
    else if(op=='/') {
    	if(y!=0)	cout<<x/y;
        else   cout<<"Divided by zero!";
	} 
       
    else if(op=='*') cout<<x*y;
   
    else cout<<"Invalid operator!";
   
  
    return 0;
}
 

1058

#include <bits/stdc++.h>
using namespace std;
int main() {
    
    double a ,b,c,dia,x1,x2;
    cin>>a>>b>>c;
    dia=b*b-4*a*c;
    
    
    if(dia>0) {
    	x1=(-b+sqrt(dia))/(2*a);
        x2=(-b-sqrt(dia))/(2*a);
        if(x1<x2)  printf("x1=%.5lf;x2=%.5lf",x1,x2);
    	else   printf("x1=%.5lf;x2=%.5lf",x2,x1);
	}     
	
    
    else if(dia==0) printf("x1=x2=%.5lf",-b/(2*a));
    else  cout<<"No answer!";
    
}
 

1059

#include <bits/stdc++.h>
using namespace std;
int main() {
    
   int n,age[101];
   double sum=0,average;
   int i;
   cin>>n;
   for(int i=1;i<=n;i++)
  {
    cin>>age[i];
   sum=sum+age[i];}
   average=sum/n;
   printf("%.2f",average);
    return 0;
}

1063

#include <bits/stdc++.h>
using namespace std;
int main() {
    
   int n;
   
   int sum=0;double average;
   int i;
   cin>>n;
   int age[n+1];
   int max=0;
   int min=INT_MAX;
   for(int i=1;i<=n;i++)
  {
  	
    cin>>age[i];
    if(age[i]>max){
    	
    	max=age[i];
	}
    if(age[i]<min)
   {
   	min=age[i];
   	
   }
   }
   
   
   printf("%d",(max-min));
    return 0;
}