Order book Yuriy Lyfenko

Simulate a sell-side order book and calculate the cost of a final purchase as fast as possible.

Input

1,000,000 order updates on STDIN, one per line:

  • + <price> <size> – add a new sell order
  • - <position> – delete the order at the given position
  • = <size> – buy <size> shares from the top of the order book

After all updates are processed, buy 1,000 shares from the top of the order book.

Output

Print the total cost of the final 1,000-share purchase to STDOUT.

Order Book Rules

Orders are sorted by price ascending (lower is better). Orders at the same price are sorted by arrival time (earlier first). Position 0 is the best (lowest-price) offer.

The = (buy) operation consumes shares starting from position 0. If an order is fully consumed, it is removed from the book.

Example

Input Order book state
+ 1137 100 (1137,100)
+ 1130 10 (1130,10), (1137,100)
+ 1130 50 (1130,10), (1130,50), (1137,100)
- 0 (1130,50), (1137,100)
+ 1150 200 (1130,50), (1137,100), (1150,200)
= 200 (1150,150)

Total cost of the last buy: 50 * 1130 + 100 * 1137 + 50 * 1150.

Restrictions:30s256Mb 1 Score Packages
#AuthorScoreLanguageSolution
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CPP
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May 8, 2026 03:21
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4Jem BishopJem Bishop Apprentice3,700
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RUST
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May 21, 2026 23:13
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CPP
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100xZohan0xZohan Apprentice6,183
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30imotw2imotw2 Novice47,428
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31Weitao WanWeitao Wan Novice48,808
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43Alexey IlyukhovAlexey Ilyukhov Novice73,650
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44parastromparastrom Apprentice73,926
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45Eli RiggsEli Riggs Novice74,472
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Dec 8, 2025 09:19
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Jun 20, 2026 18:19
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Jan 22, 2022 19:22
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Dec 20, 2025 01:58
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91Jin KimJin Kim Novice323,047
CPP
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Sep 30, 2025 09:58
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RUST
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Jan 8, 2026 16:44
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GO
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Dec 9, 2023 16:54
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RUST
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Jul 15, 2025 13:41
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CPP
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Dec 22, 2024 23:17
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96unopatientunopatient Novice510,459
RUST
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Jan 19, 2024 20:23
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Dec 6, 2023 07:35
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Sep 9, 2025 16:48
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May 8, 2026 08:56
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RUST
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Sep 7, 2025 17:03
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May 22, 2026 17:21
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103Marcus LeeMarcus Lee Novice841,923
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Feb 18, 2024 14:07
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RUST
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Dec 21, 2023 12:16
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Jul 30, 2025 14:58
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Mar 28, 2025 10:28
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Dec 7, 2023 10:05
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108Ryan Chung Yi ShengRyan Chung Yi Sheng Apprentice1,111,914
CPP
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Feb 15, 2024 20:11
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109Bernard TeoBernard Teo Skilled1,239,183
CPP
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Apr 7, 2025 15:58
740,629,635 ns · 715,728,000 ns · 2,998,000 ns · 2,281,472 B
110Mikhail ShirokovMikhail Shirokov Skilled1,264,210
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Mar 29, 2025 20:08
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111Raj ChandakRaj Chandak Novice1,271,043
CPP
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Jul 28, 2025 12:52
760,055,447 ns · 735,205,000 ns · 2,000,000 ns · 2,277,376 B
112Aleksandr KrotovAleksandr Krotov Novice1,285,360
CPP
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Dec 21, 2025 21:22
773,536,759 ns · 741,512,000 ns · 3,997,000 ns · 2,482,176 B
113BetaBeta Novice1,289,993
CPP
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Jul 15, 2025 00:29
771,226,486 ns · 746,196,000 ns · 2,000,000 ns · 2,273,280 B
114Viktor VarbanovViktor Varbanov Novice1,291,264
CPP
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Mar 13, 2026 00:03
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115Praveen KumarPraveen Kumar Novice1,291,439
GO
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Jun 15, 2026 11:25
757,162,101 ns · 743,782,000 ns · 5,253,000 ns · 2,138,112 B
116hey-researcherhey-researcher Novice1,296,905
CPP
g++13.3.0
Dec 9, 2025 18:49
775,013,438 ns · 750,205,000 ns · 2,000,000 ns · 2,478,080 B
117Taylor DettlingTaylor Dettling Skilled1,297,434
CPP
g++10.5.0
Apr 21, 2026 01:28
776,487,788 ns · 747,516,000 ns · 4,996,000 ns · 2,506,752 B
118Priyanshu GuptaPriyanshu Gupta Novice1,298,410
CPP
g++13.3.0
Oct 15, 2025 17:32
774,115,760 ns · 751,078,000 ns · 2,000,000 ns · 2,326,528 B
119Amit RahmanAmit Rahman Novice1,299,402
CPP
g++13.3.0
May 9, 2025 16:44
777,297,249 ns · 751,654,000 ns · 1,999,000 ns · 2,277,376 B
120Danylo MocherniukDanylo Mocherniuk Apprentice1,303,794
CPP
g++10.5.0
Apr 29, 2026 14:58
778,790,316 ns · 752,200,000 ns · 4,001,000 ns · 2,478,080 B
121Zhao Wei LiewZhao Wei Liew Novice1,319,167
CPP
g++9.4.0
Mar 22, 2024 12:57
828,000,410 ns · 765,116,866 ns · 0 ns · 2,297,856 B
122nn Novice1,369,477
GO
go1.22.3
May 16, 2024 19:39
857,466,647 ns · 794,296,687 ns · 0 ns · 2,195,456 B
123SrijithSrijith Novice1,374,333
GO
go1.22.1
Mar 10, 2024 04:52
861,525,515 ns · 797,113,255 ns · 0 ns · 2,203,648 B
124Oleg KovalovOleg Kovalov Skilled1,385,781
GO
go1.23.5
Jan 20, 2025 14:36
832,215,195 ns · 800,754,000 ns · 2,999,000 ns · 2,301,952 B
125paddypaddy Novice1,386,306
GO
go1.21.4
Dec 5, 2023 16:46
872,773,828 ns · 804,057,442 ns · 0 ns · 2,293,760 B
126Brendan ChouBrendan Chou Novice1,389,124
GO
go1.21.4
Nov 30, 2023 02:01
873,493,592 ns · 805,692,202 ns · 0 ns · 2,191,360 B
127Eugene ZhydzetskiEugene Zhydzetski Skilled1,407,656
GO
go1.19
Aug 22, 2022 17:40
890,377,990 ns · 816,440,736 ns · 0 ns · 2,211,840 B
128gchebanovgchebanov Skilled1,419,459
GO
go1.18.1
Apr 27, 2022 13:22
891,204,681 ns · 823,286,306 ns · 0 ns · 2,297,856 B
129Angello Gianni HernandezAngello Gianni Hernandez Novice1,781,607
CPP
clang++18.1.3
Feb 22, 2025 11:24
1,061,467,473 ns · 1,031,334,000 ns · 1,998,000 ns · 2,277,376 B
130LiamLiam Skilled1,831,254
CPP
g++9.3.0
Feb 15, 2023 20:23
1,124,365,294 ns · 1,062,127,488 ns · 0 ns · 2,191,360 B
131Robert BurkeRobert Burke Expert2,181,020
CPP
g++9.3.0
Jul 21, 2022 17:06
1,321,762,529 ns · 1,264,991,730 ns · 0 ns · 2,236,416 B
132Will RiegerWill Rieger Novice2,190,532
RUST
rust-1.74.0
Dec 4, 2023 03:15
1,336,635,628 ns · 1,270,508,443 ns · 0 ns · 2,240,512 B
133tickracertickracer Novice2,239,621
CPP
g++9.4.0
Feb 16, 2024 08:02
1,364,809,457 ns · 1,298,980,149 ns · 0 ns · 2,211,840 B
134YOM85tvE/1vsYOM85tvE/1vs Novice2,240,066
CPP
g++9.4.0
Feb 10, 2024 14:43
1,364,518,314 ns · 1,299,238,480 ns · 0 ns · 2,215,936 B
135Zhiyang LuZhiyang Lu Novice2,240,490
CPP
g++9.4.0
Feb 10, 2024 06:41
1,363,810,548 ns · 1,299,484,461 ns · 0 ns · 2,256,896 B
136Kailash GauthamKailash Gautham Novice2,240,609
CPP
g++9.4.0
Mar 8, 2024 04:30
1,368,942,337 ns · 1,299,553,213 ns · 0 ns · 2,207,744 B
137VoblissVobliss Novice2,243,243
CPP
g++9.4.0
Mar 7, 2024 13:22
1,362,913,329 ns · 1,301,080,811 ns · 0 ns · 2,203,648 B
138Henry CafaroHenry Cafaro Apprentice2,243,969
CPP
g++9.4.0
Aug 3, 2024 00:12
1,357,058,804 ns · 1,301,502,167 ns · 0 ns · 2,211,840 B
139Andrey SolovyevAndrey Solovyev Novice2,244,356
CPP
g++9.4.0
Jun 18, 2024 17:18
1,359,042,447 ns · 1,301,726,190 ns · 0 ns · 2,215,936 B
140AnSaAnSa Expert2,251,474
CPP
g++9.4.0
Jan 23, 2024 16:43
1,357,068,097 ns · 1,305,855,187 ns · 0 ns · 2,215,936 B
141cashkarucashkaru Apprentice2,255,464
CPP
g++9.4.0
Jan 11, 2024 22:03
1,371,694,865 ns · 1,308,169,400 ns · 0 ns · 2,220,032 B
142sliceteamsliceteam Apprentice2,258,956
CPP
g++9.3.0
Oct 9, 2023 02:53
1,364,761,067 ns · 1,310,194,598 ns · 0 ns · 2,211,840 B
143vsp3rvsp3r Novice2,260,412
CPP
g++9.3.0
Dec 7, 2023 04:50
1,375,882,467 ns · 1,311,038,934 ns · 0 ns · 2,211,840 B
144a-poptsova-poptsov Novice2,260,444
CPP
g++9.3.0
Nov 22, 2021 06:44
1,373,889,948 ns · 1,311,057,473 ns · 0 ns · 2,203,648 B
145Alexander KimAlexander Kim Skilled2,260,654
CPP
g++9.3.0
Dec 25, 2021 05:03
1,379,747,071 ns · 1,311,179,424 ns · 0 ns · 2,203,648 B
146Karam Jameel MooreKaram Jameel Moore Novice2,260,675
CPP
g++9.3.0
Jan 21, 2022 05:03
1,374,338,237 ns · 1,311,191,397 ns · 0 ns · 2,256,896 B
147fintarsfintars Novice2,261,587
CPP
g++9.3.0
Sep 16, 2022 14:09
1,370,412,405 ns · 1,311,720,596 ns · 0 ns · 2,203,648 B
148Jeff GreenJeff Green Novice2,261,781
CPP
g++9.3.0
Dec 3, 2023 20:58
1,375,187,256 ns · 1,311,833,108 ns · 0 ns · 2,207,744 B
149lambwheitlambwheit Novice2,263,582
CPP
g++9.3.0
Dec 5, 2023 10:57
1,374,110,227 ns · 1,312,877,301 ns · 0 ns · 2,211,840 B
150a14ua14u Novice2,264,763
CPP
g++9.3.0
Dec 5, 2023 17:04
1,378,245,651 ns · 1,313,562,453 ns · 0 ns · 2,203,648 B
151hershers Novice2,266,805
CPP
g++9.3.0
Dec 5, 2023 10:15
1,378,321,095 ns · 1,314,747,163 ns · 0 ns · 2,207,744 B
152emily graceemily grace Apprentice2,269,830
CPP
g++9.3.0
Sep 1, 2022 19:08
1,387,168,589 ns · 1,316,501,300 ns · 0 ns · 2,203,648 B
153BrrrrBrrrr Novice2,270,938
CPP
g++9.3.0
Dec 7, 2023 13:59
1,371,812,776 ns · 1,317,143,928 ns · 0 ns · 2,195,456 B
154Ilya AniskovetsIlya Aniskovets Skilled2,275,775
CPP
g++9.3.0
Dec 4, 2021 08:31
1,382,940,662 ns · 1,319,949,652 ns · 0 ns · 2,203,648 B
155Rafe LepreRafe Lepre Novice2,307,250
CPP
clang++18.1.3
Mar 27, 2025 17:33
1,361,594,738 ns · 1,337,206,000 ns · 999,000 ns · 2,490,368 B
156Paulius GasparaviciusPaulius Gasparavicius Novice2,311,150
CPP
clang++18.1.3
Oct 27, 2024 22:09
1,366,142,849 ns · 1,336,469,000 ns · 3,998,000 ns · 2,293,760 B
157ff Novice2,367,060
CPP
clang++18.1.3
Dec 17, 2024 12:53
1,399,029,518 ns · 1,371,896,000 ns · 999,000 ns · 2,314,240 B
158Steve BronderSteve Bronder Apprentice2,397,856
CPP
g++9.4.0
Apr 9, 2024 13:11
1,467,985,231 ns · 1,390,756,311 ns · 0 ns · 2,211,840 B
159Michael MoonMichael Moon Novice2,403,634
CPP
clang++18.1.3
Feb 28, 2025 16:10
1,427,011,239 ns · 1,392,110,000 ns · 1,998,000 ns · 2,486,272 B
160Ishaan VermaIshaan Verma Novice2,408,562
CPP
clang++18.1.3
Jan 19, 2025 23:00
1,425,317,698 ns · 1,392,969,000 ns · 3,997,000 ns · 2,281,472 B
161AmirAmir Apprentice2,497,045
CPP
g++9.3.0
Dec 5, 2023 22:56
1,514,337,552 ns · 1,448,285,934 ns · 0 ns · 2,199,552 B