→ About Contest
The 2009 ACM-ICPC East Central North America Regional Programming Contest (ACM-ICPC ECNA RPC) was held on Saturday October 31, 2009. We had 115 teams drawn from 60 colleges and universities throughout western Pennsylvania, Ohio, Michigan, eastern Ontario, and Indiana (excluding the Greater Chicago Metropolitan Area).
→ Virtual participation
Virtual contest is a way to take part in past contest, as close as possible to participation on time. It is supported only ICPC mode for virtual contests.
If you've seen these problems, a virtual contest is not for you - solve these problems in the archive.
If you just want to solve some problem from a contest, a virtual contest is not for you - solve this problem in the archive.
Never use someone else's code, read the tutorials or communicate with other person during a virtual contest.
→ Practice?
Want to solve the contest problems after the official contest ends? Just register for practice and you will be able to submit solutions.
→ Status filter
→ Contest materials
Problem A - Arithmetically Challenged
Contest status
| # | When | Who | Problem | Lang | Verdict | Time | Memory |
|---|---|---|---|---|---|---|---|
| 214636812 | Jul/20/2023 18:23 | rajgau | A - Arithmetically Challenged | C++17 (GCC 7-32) | Accepted | 15 ms | 200 KB |
| 30239066 | Sep/10/2017 09:41 | htc001 | A - Arithmetically Challenged | GNU C++ | Accepted | 15 ms | 0 KB |
| 227954919 | Oct/13/2023 00:36 | isentropic: altf5, Russell_Emerine, amsraman# | A - Arithmetically Challenged | C++20 (GCC 11-64) | Accepted | 15 ms | 100 KB |
| 30219972 | Sep/09/2017 10:45 | vjudge4 | A - Arithmetically Challenged | GNU C++ | Accepted | 30 ms | 0 KB |
| 18025496 | May/22/2016 06:15 | Denverjin | A - Arithmetically Challenged | GNU C++ | Accepted | 0 ms | 2000 KB |
| 30237164 | Sep/10/2017 06:28 | cnnfls_csy | A - Arithmetically Challenged | C++14 (GCC 6-32) | Accepted | 31 ms | 200 KB |
| 18027208 | May/22/2016 10:06 | caoyuan | A - Arithmetically Challenged | GNU C++ | Accepted | 15 ms | 3000 KB |
| 13923916 | Oct/29/2015 01:14 | wakaka# | A - Arithmetically Challenged | GNU C++11 | Accepted | 15 ms | 0 KB |
| 89325457 | Aug/08/2020 13:11 | hyman00 | A - Arithmetically Challenged | GNU C++11 | Accepted | 31 ms | 3800 KB |
| 89326699 | Aug/08/2020 13:30 | hyman00 | A - Arithmetically Challenged | GNU C++11 | Accepted | 31 ms | 3900 KB |
| 13924342 | Oct/29/2015 02:00 | Darooha | A - Arithmetically Challenged | OCaml | Accepted | 15 ms | 200 KB |
| 43232384 | Sep/22/2018 08:35 | numberes | A - Arithmetically Challenged | C++14 (GCC 6-32) | Accepted | 46 ms | 200 KB |
| 83787964 | Jun/15/2020 04:44 | qiaoz | A - Arithmetically Challenged | Java 8 | Accepted | 124 ms | 0 KB |
| 18030716 | May/22/2016 14:24 | ITer | A - Arithmetically Challenged | GNU C++ | Accepted | 15 ms | 2100 KB |
| 144627275 | Jan/31/2022 11:05 | SoiMae | A - Arithmetically Challenged | C++14 (GCC 6-32) | Accepted | 0 ms | 400 KB |
| 34191904 | Jan/15/2018 11:30 | ugly2333 | A - Arithmetically Challenged | C++14 (GCC 6-32) | Accepted | 15 ms | 2000 KB |
| 30248462 | Sep/10/2017 17:46 | vjudge2 | A - Arithmetically Challenged | GNU C++11 | Accepted | 0 ms | 0 KB |
| 373379655 | May/03/2026 05:52 | Lyz2013 | A - Arithmetically Challenged | C++17 (GCC 7-32) | Accepted | 203 ms | 0 KB |
| 328850359 | Jul/14/2025 08:05 | RasShalGul | A - Arithmetically Challenged | C++23 (GCC 14-64, msys2) | Accepted | 46 ms | 0 KB |
| 28073424 | Jun/27/2017 12:28 | cnnfls_csy | A - Arithmetically Challenged | C++14 (GCC 6-32) | Accepted | 15 ms | 2000 KB |
| 40921621 | Jul/29/2018 18:07 | Patti | A - Arithmetically Challenged | C++14 (GCC 6-32) | Accepted | 15 ms | 200 KB |
| 13924712 | Oct/29/2015 02:47 | CMU5: Eiyatizu, ddirenzo, tomtseng# | A - Arithmetically Challenged | Python 3 | Accepted | 358 ms | 800 KB |
| 328787952 | Jul/13/2025 16:54 | rlc202204 | A - Arithmetically Challenged | C++20 (GCC 13-64) | Accepted | 140 ms | 0 KB |
| 18072522 | May/25/2016 16:56 | llaa | A - Arithmetically Challenged | GNU C++ | Accepted | 15 ms | 2000 KB |
| 14342658 | Nov/19/2015 16:48 | hacKIT: Amtrix, niklasb, winterwolf94# | A - Arithmetically Challenged | GNU C++11 | Accepted | 61 ms | 100 KB |
| 41642680 | Aug/16/2018 09:43 | DerekFeng | A - Arithmetically Challenged | C++17 (GCC 7-32) | Accepted | 30 ms | 200 KB |
| 18106165 | May/26/2016 18:10 | llaa | A - Arithmetically Challenged | GNU C++ | Accepted | 15 ms | 2100 KB |
| 11383243 | Jun/01/2015 23:21 | The Ohio State University_TEAM-1: CodeCRUSH, wdk, zt5840# | A - Arithmetically Challenged | GNU C++11 | Accepted | 15 ms | 100 KB |
| 30239038 | Sep/10/2017 09:38 | zhuky.RLG | A - Arithmetically Challenged | GNU C++ | Accepted | 15 ms | 0 KB |
| 16689192 | Mar/13/2016 12:35 | Whalanator | A - Arithmetically Challenged | GNU C++11 | Accepted | 15 ms | 0 KB |
| 30219787 | Sep/09/2017 10:33 | Denverjin | A - Arithmetically Challenged | GNU C++11 | Accepted | 15 ms | 0 KB |
| 18033121 | May/22/2016 18:07 | ITer | A - Arithmetically Challenged | GNU C++ | Accepted | 15 ms | 2100 KB |
| 18118045 | May/27/2016 15:26 | vjudge5 | A - Arithmetically Challenged | GNU C++ | Accepted | 15 ms | 2200 KB |
| 41666818 | Aug/17/2018 03:37 | numberes | A - Arithmetically Challenged | C++14 (GCC 6-32) | Accepted | 46 ms | 100 KB |
| 16684412 | Mar/13/2016 06:41 | Monash: eggeek, mcpower, xwchow# | A - Arithmetically Challenged | GNU C++11 | Accepted | 15 ms | 0 KB |
| 62240716 | Oct/10/2019 04:30 | vjudge4 | A - Arithmetically Challenged | GNU C++11 | Accepted | 30 ms | 0 KB |
| 13492198 | Oct/08/2015 14:34 | ayaze# | A - Arithmetically Challenged | GNU C++11 | Accepted | 31 ms | 100 KB |
| 16689260 | Mar/13/2016 12:40 | MathCrusader | A - Arithmetically Challenged | GNU C++11 | Accepted | 15 ms | 0 KB |
| 18118360 | May/27/2016 15:49 | ray_bb | A - Arithmetically Challenged | GNU C++ | Accepted | 15 ms | 2100 KB |
| 43232556 | Sep/22/2018 08:48 | vjudge5 | A - Arithmetically Challenged | C++17 (GCC 7-32) | Accepted | 30 ms | 200 KB |
| 62240717 | Oct/10/2019 04:30 | vjudge3 | A - Arithmetically Challenged | GNU C++11 | Accepted | 30 ms | 0 KB |
| 12564082 | Aug/16/2015 20:20 | Boxer# | A - Arithmetically Challenged | GNU C++11 | Accepted | 124 ms | 0 KB |
| 328876447 | Jul/14/2025 12:00 | duxingpeng | A - Arithmetically Challenged | C++23 (GCC 14-64, msys2) | Accepted | 31 ms | 0 KB |
| 328845875 | Jul/14/2025 06:51 | chennie | A - Arithmetically Challenged | C++23 (GCC 14-64, msys2) | Accepted | 46 ms | 100 KB |
| 30365792 | Sep/15/2017 17:54 | vjudge2 | A - Arithmetically Challenged | GNU C++ | Accepted | 31 ms | 0 KB |
| 43234693 | Sep/22/2018 10:37 | xuziyuan | A - Arithmetically Challenged | C++14 (GCC 6-32) | Accepted | 31 ms | 200 KB |
| 41656932 | Aug/16/2018 18:17 | Alphagocc | A - Arithmetically Challenged | C++17 (GCC 7-32) | Accepted | 31 ms | 200 KB |
| 30365556 | Sep/15/2017 17:43 | unnamed_02 | A - Arithmetically Challenged | GNU C++ | Accepted | 15 ms | 0 KB |
| 43233488 | Sep/22/2018 09:55 | Patti | A - Arithmetically Challenged | GNU C++11 | Accepted | 15 ms | 100 KB |
| 18027146 | May/22/2016 10:00 | vjudge4 | A - Arithmetically Challenged | GNU C++11 | Accepted | 31 ms | 2300 KB |
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