Question

Nu ma descurc la 3 probleme de pe pbinfo.Ma ajutati va rog?#332,#335,#336!Mersi!

Answer 1

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;
}