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

2023 AIME I P12
2023 AIME I P8
2023 AIME I P5
2023 AIME II P9
2021 AIME II P14
# 2021 AIME II P9 (Number Theory)
# 2020 AOIME II P9 (Combonatorics)
2019 AIME II P6
2018 AIME II P13
2016 AIME I P13
2012 AIME I P14
2012 AIME II P14

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

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