Submission #523238

#	Time	Username	Problem	Language	Result	Execution time	Memory
523238		redstonegamer22	홀-짝 수열 (IZhO11_oddeven)	Pypy 3	0 / 100	62 ms	20312 KiB

oddeven

import math

n = int(input())
m = math.isqrt(2 * n) - 5

while m <= 0 or (m + 1) * (m + 2) // 2 <= n:
    m = m + 1

# print(m)

a = m * (m + 1) // 2 + m * (m - 1) // 2
b = n - m * (m + 1) // 2

ans = a + 2 * b - 1

print(ans)

• Subtask 1: 0 / 100