Submission #100875

#	Time	Username	Problem	Language	Result	Execution time	Memory
100875		cki86201	Odd-even (IZhO11_oddeven)	Cpython 3	100 / 100	33 ms	3404 KiB

oddeven

N = int(input())
l = 1
h = 10**100
r = -1
while l <= h:
	m = (l + h) // 2
	if m * (m-1) // 2 + 1 <= N:
		r = m
		l = m + 1
	else:
		h = m - 1
print(2*N-r)

• Subtask 1: 100 / 100