1)
#include<iostream>
using namespace std;
int main()
{
int v[1000],n,i,s=0;
cout<<"n=";cin>>n;
for(i=1;i<=n;i++)
cin>>v[i];
for(i=1;i<=n;i++)
s+=v[i];
cout<<"S= "<<s;
return 0;
}
2)
#include<iostream>
using namespace std;
int main() {
int v[1000],n,i,p=1;
cin>>n;
for(i=1;i<=n;i++)
cin>>v[i];
for(i=1;i<=n;i++)
if(v[i]%3==0){
p*=v[i];}
cout<<"P="<<p;
return 0;
}
3)
#include<iostream>
using namespace std;
int main()
{
int n,v[1000],i,s=0;
cout<<"n= ";cin>>n;
for(i=1;i<=n;i++)
cin>>v[i];
for(i=1;i<=n;i++)
if(i%2==1)
{
s+=v[i];
}
cout<<"S= "<<s;
return 0;
}
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