~/algor $ cat masalalar/birdan-n-gacha-yigindi
Begin-11
1 dan n gacha yig'indi
Muallif:
Iqbolshoh Ilhomjonov
Oson
1000 ms
64 MB
9%
Natural son $n$ berilgan. $1$ dan $n$ gacha bo'lgan barcha natural sonlar yig'indisini toping.:
$$1 + 2 + \ldots + n$$
Kiruvchi ma'lumotlar
Bitta natural son $n$.
Chiquvchi ma'lumotlar
Bitta butun son — yig'indi.
Izoh
$1 \le n \le 10^{9}$
Misollar
Kirish #1
5
Chiqish #1
15
Kirish #2
1
Chiqish #2
1