题解 | #牛牛学数列4#

using namespace std;
#define int long long
#define endl '\n'
signed main(){
    std::ios::sync_with_stdio(false); cin.tie(0);cout.tie(0);
    int n;cin>>n;
    int sum=0,s=0;//不写s=0结果会出错
    for(int i=1;i<=n;i++){      
            s=s+i;
            sum=sum+s; 
        cout<<s<<"  "<<sum<<endl;
    }
    cout<<sum<<endl;
   return 0;
}