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답안 #333790

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
333790 2020-12-07T19:27:06 Z limabeans 홀-짝 수열 (IZhO11_oddeven) Python 3
100 / 100
 16 ms 2924 KB 
def asum(x):
    return x*(x+1)//2


def f(i):
    return asum(i)



n = int(input())
if n==1:
    print(1)
else :
    lo = 1
    hi = n
    while hi-lo>1:
        mid = (lo+hi)//2
        if f(mid) < n:
            lo = mid
        else:
            hi = mid

    i = lo
    n -= f(i)
    n -= 1 # 0-index
    cur = asum(i)+asum(i-1) + 1 + 2*n
    print(cur)

Subtask #1
100.0 / 100.0

# 결과 실행 시간 메모리 Grader output
1 Correct 16 ms 2924 KB Output is correct
2 Correct 16 ms 2796 KB Output is correct
3 Correct 16 ms 2796 KB Output is correct
4 Correct 16 ms 2796 KB Output is correct
5 Correct 16 ms 2796 KB Output is correct
6 Correct 16 ms 2796 KB Output is correct
7 Correct 16 ms 2796 KB Output is correct
8 Correct 16 ms 2796 KB Output is correct
9 Correct 16 ms 2796 KB Output is correct
10 Correct 16 ms 2796 KB Output is correct
11 Correct 16 ms 2796 KB Output is correct
12 Correct 16 ms 2796 KB Output is correct
13 Correct 16 ms 2796 KB Output is correct
14 Correct 16 ms 2796 KB Output is correct
15 Correct 16 ms 2796 KB Output is correct
16 Correct 16 ms 2796 KB Output is correct
17 Correct 16 ms 2796 KB Output is correct
18 Correct 16 ms 2796 KB Output is correct
19 Correct 16 ms 2796 KB Output is correct
20 Correct 16 ms 2796 KB Output is correct
21 Correct 16 ms 2796 KB Output is correct
22 Correct 16 ms 2796 KB Output is correct