AOJ 0057 The Number of Area
#include <cstdio> int main() { int n; while(~scanf("%d\n", &n)) printf("%d\n", (n * n + n + 2) / 2); return 0; }
just implemented a formula that I found on the internet
#include <cstdio> int main() { int n; while(~scanf("%d\n", &n)) printf("%d\n", (n * n + n + 2) / 2); return 0; }
just implemented a formula that I found on the internet