上海做网站的公司哪家好,做易购网站,移动端网站的优势,《网站推广策划》#includeiostream
using namespace std;
int main() {int k;cin k;int sum 0;int n 1;while (k 0) {sum n * n;k - n;n;}sum k * (n - 1);cout sum endl;return 0;
}
#includeiostream
using namespace std;
int main() {int k;cin k;int sum 0;int n 1;while (k 0) {sum n * n;k - n;n;}sum k * (n - 1);cout sum endl;return 0;
}
