CSES - Aalto Competitive Programming 2026 - wk4 - Wed

Submission details
Task:	Sorting books
Sender:	aalto26dw_009
Submission time:	2026-09-23 17:19:53 +0300
Language:	Python3 (PyPy3)
Status:	READY
Result:	ACCEPTED

Test results
test	verdict	time
#1	ACCEPTED	0.04 s	details
#2	ACCEPTED	0.04 s	details
#3	ACCEPTED	0.04 s	details
#4	ACCEPTED	0.04 s	details
#5	ACCEPTED	0.04 s	details
#6	ACCEPTED	0.04 s	details
#7	ACCEPTED	0.04 s	details
#8	ACCEPTED	0.04 s	details
#9	ACCEPTED	0.04 s	details
#10	ACCEPTED	0.04 s	details
#11	ACCEPTED	0.04 s	details
#12	ACCEPTED	0.04 s	details
#13	ACCEPTED	0.04 s	details
#14	ACCEPTED	0.04 s	details
#15	ACCEPTED	0.04 s	details
#16	ACCEPTED	0.04 s	details
#17	ACCEPTED	0.04 s	details
#18	ACCEPTED	0.04 s	details
#19	ACCEPTED	0.04 s	details
#20	ACCEPTED	0.04 s	details
#21	ACCEPTED	0.04 s	details
#22	ACCEPTED	0.04 s	details
#23	ACCEPTED	0.04 s	details
#24	ACCEPTED	0.04 s	details
#25	ACCEPTED	0.04 s	details
#26	ACCEPTED	0.04 s	details
#27	ACCEPTED	0.04 s	details
#28	ACCEPTED	0.04 s	details
#29	ACCEPTED	0.04 s	details
#30	ACCEPTED	0.04 s	details
#31	ACCEPTED	0.04 s	details
#32	ACCEPTED	0.04 s	details
#33	ACCEPTED	0.04 s	details
#34	ACCEPTED	0.04 s	details
#35	ACCEPTED	0.04 s	details
#36	ACCEPTED	0.04 s	details
#37	ACCEPTED	0.04 s	details
#38	ACCEPTED	0.04 s	details
#39	ACCEPTED	0.04 s	details
#40	ACCEPTED	0.04 s	details
#41	ACCEPTED	0.04 s	details
#42	ACCEPTED	0.04 s	details
#43	ACCEPTED	0.04 s	details
#44	ACCEPTED	0.04 s	details
#45	ACCEPTED	0.04 s	details
#46	ACCEPTED	0.04 s	details
#47	ACCEPTED	0.04 s	details
#48	ACCEPTED	0.04 s	details
#49	ACCEPTED	0.04 s	details
#50	ACCEPTED	0.04 s	details
#51	ACCEPTED	0.05 s	details
#52	ACCEPTED	0.07 s	details
#53	ACCEPTED	0.05 s	details
#54	ACCEPTED	0.05 s	details
#55	ACCEPTED	0.05 s	details
#56	ACCEPTED	0.05 s	details
#57	ACCEPTED	0.05 s	details
#58	ACCEPTED	0.05 s	details
#59	ACCEPTED	0.05 s	details
#60	ACCEPTED	0.05 s	details
#61	ACCEPTED	0.33 s	details
#62	ACCEPTED	0.33 s	details
#63	ACCEPTED	0.33 s	details
#64	ACCEPTED	0.33 s	details
#65	ACCEPTED	0.33 s	details
#66	ACCEPTED	0.33 s	details
#67	ACCEPTED	0.33 s	details
#68	ACCEPTED	0.33 s	details
#69	ACCEPTED	0.33 s	details
#70	ACCEPTED	0.33 s	details
#71	ACCEPTED	0.12 s	details

Code

import bisect

n = int(input())
arr = list(map(int, input().split()))

vals = sorted(set(arr))
val_count = len(vals)
fenwick = [0] * (val_count + 1)

def update(idx):
	idx += 1
	while idx <= val_count:
		fenwick[idx] += 1
		idx += idx & -idx


def pref_sum(idx):
	result = 0
	while idx > 0:
		result += fenwick[idx]
		idx -= idx & -idx
	return result

ans = 0
seen = 0
for numb in arr:
	val_idx = bisect.bisect_left(vals, numb)
	not_greater = pref_sum(val_idx + 1)
	ans += seen - not_greater
	update(val_idx)
	seen += 1

print(ans)

Test details

Test 1

Verdict: ACCEPTED

input
`1 1` view save

correct output
`0` view save

user output
`0` view save

Test 2

Verdict: ACCEPTED

input
`2 3 7` view save

correct output
`0` view save

user output
`0` view save

Test 3

Verdict: ACCEPTED

input
`2 3 6` view save

correct output
`0` view save

user output
`0` view save

Test 4

Verdict: ACCEPTED

input
`2 3 8` view save

correct output
`0` view save

user output
`0` view save

Test 5

Verdict: ACCEPTED

input
`3 1 2 10` view save

correct output
`0` view save

user output
`0` view save

Test 6

Verdict: ACCEPTED

input
`3 3 7 10` view save

correct output
`0` view save

user output
`0` view save

Test 7

Verdict: ACCEPTED

input
`3 3 6 8` view save

correct output
`0` view save

user output
`0` view save

Test 8

Verdict: ACCEPTED

input
`4 5 5 4 10` view save

correct output
`2` view save

user output
`2` view save

Test 9

Verdict: ACCEPTED

input
`4 4 5 5 5` view save

correct output
`0` view save

user output
`0` view save

Test 10

Verdict: ACCEPTED

input
`4 7 10 7 1` view save

correct output
`4` view save

user output
`4` view save

Test 11

Verdict: ACCEPTED

input
`5 6 6 8 9 7` view save

correct output
`2` view save

user output
`2` view save

Test 12

Verdict: ACCEPTED

input
`5 5 10 8 10 1` view save

correct output
`5` view save

user output
`5` view save

Test 13

Verdict: ACCEPTED

input
`5 5 2 1 10 6` view save

correct output
`4` view save

user output
`4` view save

Test 14

Verdict: ACCEPTED

input
`5 6 1 8 9 3` view save

correct output
`4` view save

user output
`4` view save

Test 15

Verdict: ACCEPTED

input
`5 10 10 6 2 10` view save

correct output
`5` view save

user output
`5` view save

Test 16

Verdict: ACCEPTED

input
`5 3 1 9 9 3` view save

correct output
`3` view save

user output
`3` view save

Test 17

Verdict: ACCEPTED

input
`5 9 10 4 3 9` view save

correct output
`6` view save

user output
`6` view save

Test 18

Verdict: ACCEPTED

input
`5 1 3 8 4 5` view save

correct output
`2` view save

user output
`2` view save

Test 19

Verdict: ACCEPTED

input
`5 9 1 10 3 9` view save

correct output
`4` view save

user output
`4` view save

Test 20

Verdict: ACCEPTED

input
`5 1 4 6 5 5` view save

correct output
`2` view save

user output
`2` view save

Test 21

Verdict: ACCEPTED

input
`10 6 6 8 9 7 9 6 9 5 7` view save

correct output
`18` view save

user output
`18` view save

Test 22

Verdict: ACCEPTED

input
`10 5 10 8 10 1 2 4 10 2 3` view save

correct output
`25` view save

user output
`25` view save

Test 23

Verdict: ACCEPTED

input
`10 5 2 1 10 6 10 5 5 5 4` view save

correct output
`20` view save

user output
`20` view save

Test 24

Verdict: ACCEPTED

input
`10 6 1 8 9 3 2 6 6 9 5` view save

correct output
`18` view save

user output
`18` view save

Test 25

Verdict: ACCEPTED

input
`10 10 10 6 2 10 9 8 7 7 6` view save

correct output
`29` view save

user output
`29` view save

Test 26

Verdict: ACCEPTED

input
`10 3 1 9 9 3 4 10 10 5 1` view save

correct output
`17` view save

user output
`17` view save

Test 27

Verdict: ACCEPTED

input
`10 9 10 4 3 9 1 1 4 2 10` view save

correct output
`25` view save

user output
`25` view save

Test 28

Verdict: ACCEPTED

input
`10 1 3 8 4 5 10 8 5 10 4` view save

correct output
`12` view save

user output
`12` view save

Test 29

Verdict: ACCEPTED

input
`10 9 1 10 3 9 4 6 9 3 5` view save

correct output
`22` view save

user output
`22` view save

Test 30

Verdict: ACCEPTED

input
`10 1 4 6 5 5 1 2 4 2 1` view save

correct output
`25` view save

user output
`25` view save

Test 31

Verdict: ACCEPTED

input
`100 589284012 636562060 767928734 ...` view save

correct output
`2843` view save

user output
`2843` view save

Test 32

Verdict: ACCEPTED

input
`100 447773962 773442532 122816 137...` view save

correct output
`2446` view save

user output
`2446` view save

Test 33

Verdict: ACCEPTED

input
`100 468145963 198730372 27838076 5...` view save

correct output
`2158` view save

user output
`2158` view save

Test 34

Verdict: ACCEPTED

input
`100 591414747 75940263 760367935 9...` view save

correct output
`2298` view save

user output
`2298` view save

Test 35

Verdict: ACCEPTED

input
`100 967034924 587586158 185430194 ...` view save

correct output
`2580` view save

user output
`2580` view save

Test 36

Verdict: ACCEPTED

input
`100 238363353 59249204 934941692 8...` view save

correct output
`2578` view save

user output
`2578` view save

Test 37

Verdict: ACCEPTED

input
`100 958701283 356460601 224848374 ...` view save

correct output
`2417` view save

user output
`2417` view save

Test 38

Verdict: ACCEPTED

input
`100 81935404 244103474 837431431 3...` view save

correct output
`2315` view save

user output
`2315` view save

Test 39

Verdict: ACCEPTED

input
`100 937837681 11934038 257096283 9...` view save

correct output
`2692` view save

user output
`2692` view save

Test 40

Verdict: ACCEPTED

input
`100 11139168 391337048 538883744 5...` view save

correct output
`2302` view save

user output
`2302` view save

Test 41

Verdict: ACCEPTED

input
`200 589284012 636562060 767928734 ...` view save

correct output
`10624` view save

user output
`10624` view save

Test 42

Verdict: ACCEPTED

input
`200 447773962 773442532 122816 137...` view save

correct output
`9384` view save

user output
`9384` view save

Test 43

Verdict: ACCEPTED

input
`200 468145963 198730372 27838076 5...` view save

correct output
`8760` view save

user output
`8760` view save

Test 44

Verdict: ACCEPTED

input
`200 591414747 75940263 760367935 9...` view save

correct output
`8939` view save

user output
`8939` view save

Test 45

Verdict: ACCEPTED

input
`200 967034924 587586158 185430194 ...` view save

correct output
`9905` view save

user output
`9905` view save

Test 46

Verdict: ACCEPTED

input
`200 238363353 59249204 934941692 8...` view save

correct output
`9851` view save

user output
`9851` view save

Test 47

Verdict: ACCEPTED

input
`200 958701283 356460601 224848374 ...` view save

correct output
`10551` view save

user output
`10551` view save

Test 48

Verdict: ACCEPTED

input
`200 81935404 244103474 837431431 3...` view save

correct output
`9163` view save

user output
`9163` view save

Test 49

Verdict: ACCEPTED

input
`200 937837681 11934038 257096283 9...` view save

correct output
`9346` view save

user output
`9346` view save

Test 50

Verdict: ACCEPTED

input
`200 11139168 391337048 538883744 5...` view save

correct output
`9982` view save

user output
`9982` view save

Test 51

Verdict: ACCEPTED

input
`1000 589284012 636562060 767928734 ...` view save

correct output
`256701` view save

user output
`256701` view save

Test 52

Verdict: ACCEPTED

input
`1000 447773962 773442532 122816 137...` view save

correct output
`243505` view save

user output
`243505` view save

Test 53

Verdict: ACCEPTED

input
`1000 468145963 198730372 27838076 5...` view save

correct output
`252964` view save

user output
`252964` view save

Test 54

Verdict: ACCEPTED

input
`1000 591414747 75940263 760367935 9...` view save

correct output
`246581` view save

user output
`246581` view save

Test 55

Verdict: ACCEPTED

input
`1000 967034924 587586158 185430194 ...` view save

correct output
`241203` view save

user output
`241203` view save

Test 56

Verdict: ACCEPTED

input
`1000 238363353 59249204 934941692 8...` view save

correct output
`251093` view save

user output
`251093` view save

Test 57

Verdict: ACCEPTED

input
`1000 958701283 356460601 224848374 ...` view save

correct output
`256962` view save

user output
`256962` view save

Test 58

Verdict: ACCEPTED

input
`1000 81935404 244103474 837431431 3...` view save

correct output
`250165` view save

user output
`250165` view save

Test 59

Verdict: ACCEPTED

input
`1000 937837681 11934038 257096283 9...` view save

correct output
`246466` view save

user output
`246466` view save

Test 60

Verdict: ACCEPTED

input
`1000 11139168 391337048 538883744 5...` view save

correct output
`249076` view save

user output
`249076` view save

Test 61

Verdict: ACCEPTED

input
`200000 589284012 636562060 767928734 ...` view save

correct output
`9983154934` view save

user output
`9983154934` view save

Test 62

Verdict: ACCEPTED

input
`200000 447773962 773442532 122816 137...` view save

correct output
`9998885834` view save

user output
`9998885834` view save

Test 63

Verdict: ACCEPTED

input
`200000 468145963 198730372 27838076 5...` view save

correct output
`9995310844` view save

user output
`9995310844` view save

Test 64

Verdict: ACCEPTED

input
`200000 591414747 75940263 760367935 9...` view save

correct output
`10000936270` view save

user output
`10000936270` view save

Test 65

Verdict: ACCEPTED

input
`200000 967034924 587586158 185430194 ...` view save

correct output
`10002145347` view save

user output
`10002145347` view save

Test 66

Verdict: ACCEPTED

input
`200000 238363353 59249204 934941692 8...` view save

correct output
`9989708150` view save

user output
`9989708150` view save

Test 67

Verdict: ACCEPTED

input
`200000 958701283 356460601 224848374 ...` view save

correct output
`9997845631` view save

user output
`9997845631` view save

Test 68

Verdict: ACCEPTED

input
`200000 81935404 244103474 837431431 3...` view save

correct output
`10016175198` view save

user output
`10016175198` view save

Test 69

Verdict: ACCEPTED

input
`200000 937837681 11934038 257096283 9...` view save

correct output
`9983428867` view save

user output
`9983428867` view save

Test 70

Verdict: ACCEPTED

input
`200000 11139168 391337048 538883744 5...` view save

correct output
`9971613818` view save

user output
`9971613818` view save

Test 71

Verdict: ACCEPTED

input
`200000 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...` view save

correct output
`0` view save

user output
`0` view save

Aalto Competitive Programming 2026 - wk4 - Wed

Sorting books

Code

Test details

Test 1

Test 2

Test 3

Test 4

Test 5

Test 6

Test 7

Test 8

Test 9

Test 10

Test 11

Test 12

Test 13

Test 14

Test 15

Test 16

Test 17

Test 18

Test 19

Test 20

Test 21

Test 22

Test 23

Test 24

Test 25

Test 26

Test 27

Test 28

Test 29

Test 30

Test 31

Test 32

Test 33

Test 34

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Test 44

Test 45

Test 46

Test 47

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Test 50

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Test 52

Test 53

Test 54

Test 55

Test 56

Test 57

Test 58

Test 59

Test 60

Test 61

Test 62

Test 63

Test 64

Test 65

Test 66

Test 67

Test 68

Test 69

Test 70

Test 71

Tasks

Submissions (aalto26dw_009)