Problema #332
#include<iostream.h>
using namespace std;
int main()
{int i=1, s=0, n;
cout<<"n="; cin>>n;
while(i<=n)
{s=s+i*(i+1);
i=i+1;}
cout<<"s="<<s;
return 0;
}
Problema #336
#include<iostream.h>
using namespace std;
int main()
{int n, s=0, i, j=1;
cout<<"n="; cin>>n;
for(i=0;i<=n;i++)
{s=s+j*(n-i);
j++;}
cout<<"s="<<s;
return 0;
}
Problema #335
#include<iostream.h>
using namespace std;
int main()
{int n, s=0, i;
cout<<"n="; cin>>n;
for(i=1;i<=n;i++)
{ if(i%2==1)
s=s+i*(i+1);
else
s=s-i*(i+1);
}
cout<<"s="<<s;
return 0;
}