[SW Expert Academy, SWEA 2025] N줄덧셈 (python)

https://swexpertacademy.com/main/code/problem/problemDetail.do?problemLevel=1&contestProbId=AV5QFZtaAscDFAUq&categoryId=AV5QFZtaAscDFAUq&categoryType=CODE&problemTitle=&orderBy=FIRST_REG_DATETIME&selectCodeLang=ALL&select-1=1&pageSize=10&pageIndex=2

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※ SW Expert 아카데미의 문제를 무단 복제하는 것을 금지합니다.

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n = int(input())

sum = 0

for i in range(1, n + 1):
    sum += i

print(sum)

공식 사용

n = int(input())

sum = int(n * (n + 1) / 2)

print(sum)