Daniel Zhou's Profile

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

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

$\textbf{IMO}$

  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)


$\textbf{USAMO}$

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

$\textbf{USAJMO}$

  1. 2019 USAJMO P1
  2. 2015 USAJMO P6 / USAMO P4


$\textbf{AIME}$

  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


$\textbf{AMC}$

  1. 2023 AMC 10B P14
  2. 2022 AMC 10A P24
  3. 2018 AMC 12A P24
  4. 2015 AMC 12A P23 / AMC 10A P25 (Combinatorics)


$\textbf{OTHER}$

  1. 2016 PUMaC G5 (A) | G6 (B)
  2. 2016 PUMaC G7 (A) | G8 (B) (Geometry)
  3. 2018 Canadian Mathematical Olympiad P3
  4. 2019 EGMO P1
  5. 2015 All Russian Olympiad 11.5
  6. 2014 Vietnam Mathematical Olympiad P1
  7. 2020 USOMO Problem 1
  8. 2013 Fall OMO P24
  9. 2023 ARML IR-P6
  10. 2023 ANMC P17(AOPS Nurds Math Contest)
  11. 2023 ANMC P23 (AOPS Nurds Math Contest)
  12. 2016 India Postal Set 3 P2
  13. 2023 Michigan Math Meet