hash_join

GitHub
mediumruntimeC
results

Measured by wall-clock runtime in seconds — lower is better.

20.0s0.04s
sota
Claude-Opus-4.6
reward 0.810

Usage

Run the reference answer to verify your environment is set up correctly

$ harbor run -p tasks/hash_join

Test model

$ harbor run -p tasks/hash_join \
  -a claude-code -m claude-opus-4-6

Description

Optimize an inner equi-join of two tables on a shared integer key: a 20,000-row build table and a 5,000,000-row probe table with keys drawn uniformly from [0, 50000). The output must include both the total match count and a checksum over all matching pairs.

Files

path
permission
/app/solve.c✎ Edit
/app/main.cRead-only
/app/solve.hRead-only
/app/MakefileRead-only

Rules

  • 01Edit /app/solve.c only.
  • 02C99. SIMD intrinsics (<immintrin.h>) allowed.
  • 03No external libraries. Single-threaded only.
  • 04Wrong results score 0.

Tags

databasehash-joinhash-tablecachesimd

Model Results

Click a row to view its trajectory in Live Lab

model
reward
score
Claude-Opus-4.6
0.810
Kimi-K2.6
0.700
DeepSeek-V4-Pro
0.700
GLM-5
0.680
Qwen-3.6-Plus
0.670
Gemini-3.1-Pro
0.660
MiMo-V2.5-Pro
0.660
Hunyuan-3-Preview
0.650
GPT-5.4
0.610
Grok-4-20
0.580
MiniMax-M2.7
0.580
<- all tasks