CSES - Summa Seuraava pseudokoodi esittää funktion count, joka laskee summan $1+2+\dots+n$.
function count(n)
    total = 0
    for i = 1 to n
        total += i
    return total
Toteuta pseudokoodia vastaava funktio Pythonilla tai Javalla.

Python

Toteuta tiedostoon sum.py funktio count, joka laskee summan.
def count(n):
    # TODO

if __name__ == "__main__":
    print(count(1)) # 1
    print(count(2)) # 3
    print(count(3)) # 6
    print(count(10)) # 55
    print(count(123)) # 7626
Java

Toteuta tiedostoon Sum.java metodi count, joka laskee summan.
public class Sum {
    public int count(int n) {
        // TODO
    }

    public static void main(String[] args) {
        Sum s = new Sum();
        System.out.println(s.count(1)); // 1
        System.out.println(s.count(2)); // 3
        System.out.println(s.count(3)); // 6
        System.out.println(s.count(10)); // 55
        System.out.println(s.count(123)); // 7626
    }
}