Submission #882221

#	Time	Username	Problem	Language	Result	Execution time	Memory
882221		Mr_Husanboy	홀-짝 수열 (IZhO11_oddeven)	Cpython 3	100 / 100	13 ms	2928 KiB

oddeven

n = int(input())
l = 1
r = 10**50
while l <= r:
    m = (l + r) // 2
    if((m + 1) * m // 2 > n):
        r = m - 1
    else:
        l = m + 1
l -= 1
 
k = (l + 1) * l // 2
 
if l % 2 == 1:
    if n == k:
        print((n - (l - 1) // 2) * 2 - 1)
    else:
        print((n - (l + 1) // 2) * 2)
else:
    if n == k:
        print((n - l // 2) * 2)
    else:
        print((n - l // 2) * 2 - 1)

• Subtask 1: 100 / 100