0057 - The Number of Area
#include <iostream> using namespace std; void Slove(int n) { cout << (n*n+n+2)/2 << endl; } int main(void) { int n; while (cin >> n) Slove(n); return 0; }
階差数列.....
#include <iostream> using namespace std; void Slove(int n) { cout << (n*n+n+2)/2 << endl; } int main(void) { int n; while (cin >> n) Slove(n); return 0; }
階差数列.....