Submission #73406806

Source Code Expand

from atcoder import fenwicktree

N = int(input())
A = list(map(lambda x: int(x)-1, input().split()))


def count_inversions_byfenwicktree(A):
    n = len(A)
    fwt = fenwicktree.FenwickTree(n)

    cnt = 0
    for i in range(n-1, -1, -1):
        cnt += fwt.sum(0, A[i])
        fwt.add(A[i], 1)
    return cnt

ans = count_inversions_byfenwicktree(A)
print(ans)

Submission Info

Submission Time
Task E - Organizing the Bookshelf
User ytamu555
Language Python (PyPy 3.11-v7.3.20)
Score 466
Code Size 380 Byte
Status AC
Exec Time 180 ms
Memory 144432 KiB

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 466 / 466
Status
AC × 3
AC × 59
Set Name Test Cases
Sample sample01.txt, sample02.txt, sample03.txt
All sample01.txt, sample02.txt, sample03.txt, in01.txt, in02.txt, in03.txt, in04.txt, in05.txt, in06.txt, in07.txt, in08.txt, in09.txt, in10.txt, in11.txt, in12.txt, in13.txt, in14.txt, in15.txt, in16.txt, in17.txt, in18.txt, in19.txt, in20.txt, in21.txt, in22.txt, in23.txt, in24.txt, in25.txt, in26.txt, in27.txt, in28.txt, in29.txt, in30.txt, in31.txt, in32.txt, in33.txt, in34.txt, in35.txt, in36.txt, in37.txt, in38.txt, in39.txt, in40.txt, in41.txt, in42.txt, in43.txt, in44.txt, in45.txt, in46.txt, in47.txt, in48.txt, in49.txt, in50.txt, in51.txt, in52.txt, in53.txt, in54.txt, in55.txt, in56.txt
Case Name Status Exec Time Memory
in01.txt AC 122 ms 110528 KiB
in02.txt AC 124 ms 110472 KiB
in03.txt AC 122 ms 110244 KiB
in04.txt AC 122 ms 110512 KiB
in05.txt AC 123 ms 110284 KiB
in06.txt AC 123 ms 110396 KiB
in07.txt AC 130 ms 111428 KiB
in08.txt AC 158 ms 128796 KiB
in09.txt AC 166 ms 136676 KiB
in10.txt AC 175 ms 144168 KiB
in11.txt AC 180 ms 144208 KiB
in12.txt AC 173 ms 144256 KiB
in13.txt AC 170 ms 144032 KiB
in14.txt AC 176 ms 144308 KiB
in15.txt AC 171 ms 144164 KiB
in16.txt AC 170 ms 143940 KiB
in17.txt AC 170 ms 144160 KiB
in18.txt AC 177 ms 143944 KiB
in19.txt AC 173 ms 144140 KiB
in20.txt AC 169 ms 143936 KiB
in21.txt AC 172 ms 144300 KiB
in22.txt AC 172 ms 144216 KiB
in23.txt AC 172 ms 144212 KiB
in24.txt AC 129 ms 111636 KiB
in25.txt AC 125 ms 110600 KiB
in26.txt AC 129 ms 111752 KiB
in27.txt AC 133 ms 112156 KiB
in28.txt AC 132 ms 112084 KiB
in29.txt AC 128 ms 111940 KiB
in30.txt AC 141 ms 119036 KiB
in31.txt AC 129 ms 111440 KiB
in32.txt AC 126 ms 110792 KiB
in33.txt AC 132 ms 112096 KiB
in34.txt AC 122 ms 110400 KiB
in35.txt AC 122 ms 110236 KiB
in36.txt AC 175 ms 144120 KiB
in37.txt AC 166 ms 144048 KiB
in38.txt AC 168 ms 144048 KiB
in39.txt AC 170 ms 144320 KiB
in40.txt AC 178 ms 143932 KiB
in41.txt AC 147 ms 122556 KiB
in42.txt AC 147 ms 122648 KiB
in43.txt AC 169 ms 144432 KiB
in44.txt AC 171 ms 144024 KiB
in45.txt AC 122 ms 110556 KiB
in46.txt AC 123 ms 110096 KiB
in47.txt AC 122 ms 110552 KiB
in48.txt AC 122 ms 110224 KiB
in49.txt AC 122 ms 110360 KiB
in50.txt AC 122 ms 110564 KiB
in51.txt AC 122 ms 110240 KiB
in52.txt AC 122 ms 110232 KiB
in53.txt AC 122 ms 110468 KiB
in54.txt AC 121 ms 110232 KiB
in55.txt AC 122 ms 110236 KiB
in56.txt AC 123 ms 110124 KiB
sample01.txt AC 122 ms 110276 KiB
sample02.txt AC 121 ms 110240 KiB
sample03.txt AC 123 ms 110236 KiB