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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RUST
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CPP
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May 8, 2026 03:21
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CPP
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RUST
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CPP
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CPP
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CPP
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90xZohan0xZohan Apprentice6,183
RUST
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Mar 2, 2026 09:46
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10KeefeKeefe Expert6,543
CPP
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RUST
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RUST
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27Tejas G.Tejas G. Skilled45,830
CPP
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28imotw2imotw2 Apprentice47,428
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40Alexey IlyukhovAlexey Ilyukhov Novice73,650
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42Eli RiggsEli Riggs Novice74,472
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44Sergey StreminSergey Stremin Expert74,843
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46Weitao WanWeitao Wan Novice79,505
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47korey-skorey-s Apprentice81,576
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48Ian MckibbenIan Mckibben Expert87,047
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RUST
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RUST
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GO
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Nov 25, 2023 05:05
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CPP
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Dec 20, 2025 01:58
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89Jin KimJin Kim Novice323,047
CPP
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Sep 30, 2025 09:58
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90AriiellusAriiellus Novice336,009
RUST
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Jan 8, 2026 16:44
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91Brian PiccianoBrian Picciano Novice336,459
GO
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Dec 9, 2023 16:54
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92nolipolsupnolipolsup Novice379,634
RUST
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Jul 15, 2025 13:41
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93HighloadGPTO1HighloadGPTO1 Skilled429,838
CPP
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Dec 22, 2024 23:17
276,453,798 ns · 249,306,000 ns · 0 ns · 2,441,216 B
94unopatientunopatient Novice510,459
RUST
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Jan 19, 2024 20:23
358,671,888 ns · 296,065,972 ns · 0 ns · 2,199,552 B
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CSHARP
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Dec 6, 2023 07:35
433,081,884 ns · 361,133,207 ns · 0 ns · 2,207,744 B
96Jacqueline NabagloJacqueline Nabaglo Novice656,359
CPP
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Sep 9, 2025 16:48
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97Ashish AhujaAshish Ahuja Apprentice661,758
CPP
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May 8, 2026 08:56
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RUST
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May 13, 2025 16:12
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CPP
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Sep 7, 2025 17:03
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100Marcus LeeMarcus Lee Novice841,923
CPP
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Feb 18, 2024 14:07
552,568,103 ns · 488,315,242 ns · 0 ns · 2,256,896 B
101DenisDenis Novice905,169
RUST
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Dec 21, 2023 12:16
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102Leonardo Pedrozo AmaralLeonardo Pedrozo Amaral Novice966,840
CPP
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Jul 30, 2025 14:58
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CSHARP
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Mar 28, 2025 10:28
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104nolipolsupnolipolsup Novice1,007,023
RUST
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Dec 7, 2023 10:05
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105Ryan Chung Yi ShengRyan Chung Yi Sheng Skilled1,111,914
CPP
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Feb 15, 2024 20:11
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106Bernard TeoBernard Teo Expert1,239,183
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
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CPP
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Mar 29, 2025 20:08
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108Raj ChandakRaj Chandak Novice1,271,043
CPP
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Jul 28, 2025 12:52
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109Aleksandr 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
110BetaBeta 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
111Viktor VarbanovViktor Varbanov Novice1,291,264
CPP
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Mar 13, 2026 00:03
778,421,225 ns · 744,934,000 ns · 3,999,000 ns · 2,494,464 B
112hey-researcherhey-researcher Novice1,296,905
CPP
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Dec 9, 2025 18:49
775,013,438 ns · 750,205,000 ns · 2,000,000 ns · 2,478,080 B
113Taylor DettlingTaylor Dettling Expert1,297,434
CPP
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Apr 21, 2026 01:28
776,487,788 ns · 747,516,000 ns · 4,996,000 ns · 2,506,752 B
114Priyanshu GuptaPriyanshu Gupta Novice1,298,410
CPP
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Oct 15, 2025 17:32
774,115,760 ns · 751,078,000 ns · 2,000,000 ns · 2,326,528 B
115Amit RahmanAmit Rahman Novice1,299,402
CPP
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May 9, 2025 16:44
777,297,249 ns · 751,654,000 ns · 1,999,000 ns · 2,277,376 B
116Danylo 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
117Zhao 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
118nn 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
119SrijithSrijith 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
120Oleg 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
121paddypaddy 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
122Brendan 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
123Eugene 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
124gchebanovgchebanov Expert1,419,459
GO
go1.18.1
Apr 27, 2022 13:22
891,204,681 ns · 823,286,306 ns · 0 ns · 2,297,856 B
125Angello 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
126LiamLiam 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
127Robert 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
128Will 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
129tickracertickracer 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
130YOM85tvE/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
131Zhiyang 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
132Kailash 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
133VoblissVobliss 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
134Henry 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
135Andrey 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
136AnSaAnSa 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
137cashkarucashkaru 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
138sliceteamsliceteam 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
139vsp3rvsp3r 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
140a-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
141Alexander 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
142Karam 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
143fintarsfintars 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
144Jeff 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
145lambwheitlambwheit 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
146a14ua14u 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
147hershers 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
148emily 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
149BrrrrBrrrr 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
150Ilya 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
151Rafe 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
152Paulius 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
153ff 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
154Steve 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
155Michael 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
156Ishaan 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
157AmirAmir 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