IMC 2017
contestants
331
problems
10 (5+5)
score scale
0–10
per-problem results
yes
Notes on this edition’s data
- Each problem marked out of 10.
Per-problem difficulty
Day 1
Day 2
Difficulty vs discrimination
Each dot is one problem. X — how many solved it (scored ≥ 8 of 10); Y — discrimination, i.e. how well the problem told strong contestants from weak ones (score-vs-total correlation).
A good problem sits high and away from the edges. Bottom-left dots separated nobody — almost everyone failed them the same way.
Problem statistics
Same data as the Day 1 / Day 2 charts above.
| # | difficulty | avg | solved | near-0 | disc | topics | |
|---|---|---|---|---|---|---|---|
| Day 1 | |||||||
| P1 | easy | 6.9 | 59% | 10% | 0.35 | linear algebra | |
| P2 | hard | 3.2 | 26% | 56% | 0.63 | real analysisinequalities | |
| P3 | hard | 3.0 | 25% | 57% | 0.58 | number theory | |
| P4 | very hard | 1.4 | 11% | 81% | 0.52 | combinatoricsprobability | |
| P5 | killer | 0.2 | 2% | 97% | 0.42 | polynomialscomplex analysis | |
| Day 2 | |||||||
| P6 | easy | 8.0 | 73% | 9% | 0.35 | integrationreal analysis | |
| P7 | very hard | 1.6 | 14% | 83% | 0.44 | polynomialsreal analysis | |
| P8 | easy | 6.2 | 52% | 28% | 0.50 | linear algebra | |
| P9 | hard | 2.2 | 15% | 69% | 0.59 | real analysissequences & series | |
| P10 | killer | 0.2 | 2% | 97% | 0.42 | geometry | |
Field cohort = total ≥ 3 points; difficulty is computed live by the API. Discrimination is the corrected item–total correlation.