Daniel Zhou's Profile

Hi! I'm Daniel Zhou. I post on AOPS solutions to various problems including AMC, AIME, USA(J)MO, HMMT, IMO, etc

Here are some of the contributions I've made so far:

1. 2014 IMO Problem 1 (Algebra)
2. 2013 IMO Problem 4 (Geometry)
3. 2012 IMO Shortlist Problem 1 (Combinatorics)
4. 2010 IMO Shortlist - Geometry Problem 1 (Geometry)
5. 2006 IMO Problem 1 (Geometry )
6. 2001 IMO Shortlist Problem 1 (Geometry)
7. 1996 IMO Shortlist Problem 2 (Combinatorics)
8. 1995 IMO Problem 1 (Geometry)

1. 2023 USAMO P2
2. 2020 USOMO P1
3. 2005 USAMO P1
4. 1997 USAMO P1
5. 1997 USAMO P2
6. 1996 USAMO P2

2015 USAMO P4 / USAJMO P6

# 2019 USAJMO P1
# 2015 USAJMO P6 / USAMO P4

1. 2024 AIME I P13
2. 2024 AIME II P10
3. 2024 AIME II P11
4. 2023 AIME I P1
5. 2023 AIME I P12 (Solution 4)
6. 2023 AIME I P8 (Solution 3)
7. 2023 AIME I P5 (Solution 4)
8. 2023 AIME II P9 (Solution 2)
9. 2021 AIME II P14 (Solution 2)
10. 2021 AIME II P14
11. 2021 AIME II P9 (Number Theory)
12. 2020 AIME I P12
13. 2020 AOIME II P9 (Combinatorics)
14. 2019 AIME II P6
15. 2018 AIME I P15
16. 2018 AIME II P13
17. 2016 AIME I P13
18. 2012 AIME I P14
19. 2012 AIME II P14
20. 2012 AIME II P15
21. 2020 AOIME II P9

1. 2015 AMC 10A P25 / AMC 12A P23 (Combinatorics)

2023 ANMC P23
2023 ANMC P17
2019 EGMO P1
2018 Canadian Mathematical Olympiad P3
2016 India Postal Set 3 P2
2016 PUMaC G5 (A) | G6 (B)

1. 2016 PUMaC G7 (A) | G8 (B) (Geometry)

2015 All Russian Olympiad 11.5
2014 Vietnam Mathematical OLympiad P1
2013 Fall OMO P24