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Programming Parallel Computers

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Open 2026

IndexContestSubmissionsPre0CP12a2b2c3a3b459aIS246a6b9aMF129aSO456LLM9aI8MM234569a9b9cX0a0b

Contest

Task Rank Time Instr.
× 109		 Cycles
× 109		 GHz Threads Lines
of code		 Nickname
Pre0 1 0.000367 0.000341 0.00070 1.91 0.99 78 :3
2 0.00051 0.00201 0.00140 2.77 0.99 27 snail
3 0.00052 0.00251 0.00144 2.77 0.99 41 alpine
10 0.00066 0.00226 0.00131 1.98 0.99 35
CP1 1 1.76 17.2 7.81 4.43 1.00 126 ezcache
2 2.75 11.7 12.2 4.44 1.00 68 l
3 3.84 20.3 17.2 4.48 1.00 137 ExitNode
10 7.19 64.2 32.1 4.47 1.00 68
CP2a 1 1.63 17.2 7.21 4.42 1.00 294 ezcache
2 2.22 24.3 9.93 4.47 1.00 68 hhh
3 2.47 20.4 11.0 4.45 1.00 113 ExitNode
10 3.46 24.3 15.4 4.46 1.00 72
CP2b 1 0.211 16.2 12.8 3.68 16.3 155 ExitNode
2 0.225 17.2 14.8 3.80 17.2 119 ezcache
3 0.302 24.4 24.1 4.00 19.9 56 WhereIsWalde
10 0.450 24.3 34.9 4.11 18.8 63
CP2c 1 0.52 2.75 2.03 3.93 1.00 157 ezcache
2 0.91 6.41 3.59 3.96 1.00 156 ExitNode
3 1.44 3.43 5.71 3.97 1.00 114 snizovtsev
10 2.77 5.34 10.9 3.96 1.00 70
CP3a 1 1.18 76.7 69.6 3.34 17.6 1320 trolmark
2 1.88 85.6 63.8 3.34 10.2 162 ezcache
3 2.16 107 128 3.37 17.5 171 sros
10 2.91 306 166 3.67 15.5 284
CP3b 1 0.67 47.2 33.5 3.30 15.1 1282 trolmark
2 0.78 44.6 51.5 3.32 19.8 164 ezcache
3 1.05 54.3 60.4 3.34 17.2 172 sros
10 1.46 120 73.5 3.69 13.7 271
CP4 1 0.104 0.74 0.367 3.53 1.00 145 ezcache
2 0.110 0.84 0.400 3.63 1.00 141 Oona
3 0.123 0.96 0.455 3.69 1.00 82 l
10 0.184 1.38 0.73 3.94 1.00 110
CP5 1 0.456 3.54 1.95 4.28 1.00 251 :3
2 0.53 4.17 2.26 4.30 1.00 293 ezcache
3 0.56 5.09 2.44 4.31 1.00 371 sros
10 2.66 28.1 11.8 4.45 1.00 147
CP9a 1 0.78 44.6 51.3 3.33 19.8 164 ezcache
2 1.43 60.0 86.3 3.34 18.0 441 ExitNode
3 7.58 231 565 3.78 19.7 70 Razib
IS2 1 0.0100 0.0346 0.0119 1.19 1.00 135 sros
2 0.0175 0.0466 0.0209 1.19 1.00 109 kaka
3 0.0207 0.058 0.0246 1.19 1.00 120 Hui
10 0.0469 0.175 0.071 1.51 1.00 124
IS4 1 0.127 8.73 7.40 2.93 19.5 392 :3
2 0.71 84.4 50.8 3.70 19.2 186 sros
3 0.77 84.5 56.9 3.70 19.9 184 kaka
10 2.67 277 201 3.77 19.9 142
IS6a 1 0.164 12.8 9.88 3.07 19.7 322 :3
2 0.282 26.2 17.1 3.23 18.7 243 sros
3 0.83 72.7 60.7 3.70 19.8 404 Bafattori
IS6b 1 0.249 2.36 1.08 4.35 1.00 225 ExitNode
2 0.360 3.56 1.52 4.22 1.00 194 Razib
3 0.434 4.32 1.89 4.34 1.00 151 snizovtsev
IS9a 1 0.071 3.63 2.76 2.61 13.8 192 kaka
2 0.103 1.66 1.94 2.34 7.53 400 ExitNode
3 2.55 99.3 105 4.21 9.79 378 l
MF1 1 6.78 17.1 30.4 4.48 1.00 47 ExitNode
2 6.90 18.0 30.9 4.48 1.00 38 sros
3 6.90 19.1 30.9 4.48 1.00 43 snizovtsev
10 8.20 33.9 36.7 4.47 1.00 58
MF2 1 0.499 19.4 41.0 4.12 19.9 43 snizovtsev
2 0.51 19.9 41.7 4.11 19.9 72 Bafattori
3 0.51 20.0 42.0 4.13 19.8 60 Markku
10 0.60 32.6 49.9 4.15 19.9 57
MF9a 1 0.78 62.7 65.3 4.18 19.9 264 sros
2 0.80 75.4 66.8 4.18 19.9 238 Rafaboy
3 0.81 96.5 47.1 4.14 14.0 432 Bafattori
SO4 1 0.87 23.6 22.5 3.83 6.76 80 Mikko
2 0.87 18.7 20.3 3.81 6.12 155 t
3 0.90 17.0 26.6 3.77 7.86 100 kaka
SO5 1 0.55 23.2 18.1 3.77 8.77 92 Mikko
2 0.59 27.8 26.0 3.92 11.2 54 sros
3 0.59 21.2 32.0 3.96 13.5 42 snizovtsev
SO6 1 0.61 5.01 2.63 4.32 1.00 165 snizovtsev
2 0.68 5.73 2.95 4.34 1.00 138 kaka
3 0.89 8.11 3.89 4.37 1.00 117 l
LLM9a 1 0.396 11.9 21.1 3.29 16.1 1017 am17an
2 0.90 34.7 48.5 3.88 13.9 617 Bafattori
3 10.3 187 786 3.83 19.9 127 l
I8MM2 1 0.64 6.22 2.80 4.34 1.00 35 Bafattori
2 0.65 6.20 2.80 4.34 1.00 21 kaka
3 0.65 6.22 2.80 4.32 1.00 27 Razib
10 5.67 64.0 25.4 4.47 1.00 22
I8MM3 1 0.84 58.1 55.9 3.37 19.8 130 sros
2 0.94 61.6 60.8 3.55 18.2 116 snizovtsev
3 1.77 61.4 90.6 3.37 15.1 106 Markku
I8MM4 1 0.58 6.36 2.51 4.32 1.00 35 Razib
2 0.61 5.80 2.65 4.31 1.00 52 l
3 0.68 6.93 2.93 4.33 1.00 54 Markku
I8MM5 1 1.39 14.5 6.03 4.34 1.00 170 sros
2 1.48 15.3 6.53 4.42 1.00 126 snizovtsev
3 1.90 19.3 8.38 4.42 1.00 90 l
I8MM6 1 0.73 7.72 3.16 4.31 1.00 106 snizovtsev
2 1.32 13.6 5.82 4.40 1.00 85 l
3 4.02 41.1 17.9 4.46 1.00 52 kaka
I8MM9a 1 0.400 32.4 24.9 3.62 17.2 115 RasmusK
2 0.97 47.3 58.1 3.38 17.8 127 l
3 1.65 17.4 108 3.36 19.4 136 kaka
I8MM9b 1 3.80 40.8 17.0 4.46 1.00 108 l
I8MM9c 1 3.55 39.1 15.8 4.46 1.00 181 snizovtsev
2 7.89 86.4 35.3 4.47 1.00 109 l
X0a 1 0.0000154 0.00000234 0.0000056 0.456 0.454 10 :3
2 0.00234 0.00266 0.00261 1.17 0.075 15 ankithooda
3 0.0397 0.120 0.080 2.02 1.00 12 Razib
X0b 1 0.000331 0.00125 0.000384 1.17 0.97 12 Razib

✓ = already graded

Contest points

All correct submissions to the following tasks take part in the contest and you can earn extra points! When the course closes, we will compare your solution with the fastest correct solution that we received this year. If your running time is close to the fastest running time, you will get extra points as follows:

Task Running time Current Points
CP3a ≤ 1.20 × fastest = 1.20 × 1.18 s = 1.42 s 1
≤ 1.05 × fastest = 1.05 × 1.18 s = 1.24 s 2
CP3b ≤ 1.20 × fastest = 1.20 × 0.67 s = 0.81 s 1
≤ 1.05 × fastest = 1.05 × 0.67 s = 0.71 s 2
CP5 ≤ 1.20 × fastest = 1.20 × 0.456 s = 0.55 s 1
≤ 1.05 × fastest = 1.05 × 0.456 s = 0.479 s 2
IS4 ≤ 1.20 × fastest = 1.20 × 0.127 s = 0.152 s 1
≤ 1.05 × fastest = 1.05 × 0.127 s = 0.133 s 2
IS6a ≤ 1.20 × fastest = 1.20 × 0.164 s = 0.197 s 1
≤ 1.05 × fastest = 1.05 × 0.164 s = 0.172 s 2
IS6b ≤ 1.20 × fastest = 1.20 × 0.249 s = 0.298 s 1
≤ 1.05 × fastest = 1.05 × 0.249 s = 0.261 s 2
SO4 ≤ 1.20 × fastest = 1.20 × 0.87 s = 1.04 s 1
≤ 1.10 × fastest = 1.10 × 0.87 s = 0.96 s 2
SO5 ≤ 1.20 × fastest = 1.20 × 0.55 s = 0.66 s 1
≤ 1.10 × fastest = 1.10 × 0.55 s = 0.60 s 2
SO6 ≤ 1.20 × fastest = 1.20 × 0.61 s = 0.73 s 1
≤ 1.05 × fastest = 1.05 × 0.61 s = 0.64 s 2
LLM9a ≤ 1.20 × fastest = 1.20 × 0.396 s = 0.476 s 1
≤ 1.05 × fastest = 1.05 × 0.396 s = 0.416 s 2
I8MM9a ≤ 1.20 × fastest = 1.20 × 0.400 s = 0.480 s 1
≤ 1.05 × fastest = 1.05 × 0.400 s = 0.420 s 2
I8MM9b ≤ 1.20 × fastest = 1.20 × 3.80 s = 4.56 s 1
≤ 1.05 × fastest = 1.05 × 3.80 s = 3.99 s 2
I8MM9c ≤ 1.20 × fastest = 1.20 × 3.55 s = 4.26 s 1
≤ 1.05 × fastest = 1.05 × 3.55 s = 3.73 s 2

Here “Current” is our current estimate of the threshold based on the submissions we have received, but please note that it will change over time as we receive and grade new solutions!

Contest rules

You do not need to do anything special to benefit from the contest points; they will be calculated automatically when the course closes.

Late submissions and resubmissions are fine! You can improve your solutions during the last week of the course, and they are eligible for the extra points from the contest!

Only fully correct solutions count in the contest: you must have a successful submission.