Problemsetting
I enjoy writing problems.
This page contains a list of problems I’ve written that have appeared on competitive programming and math contests – mainly the Montgomery Blair Informatics Tournament and the Harvard MIT Math Tournament. The problems I think are the coolest appear in bold. I have given each problem a subjective difficulty score, from I to V (easiest to hardest).
Updated 12/26/22
Competitive Programming
Contest  Problem  Difficulty 

mBIT 2019F Varsity #3  Mountain Mileage  II 
mBIT 2020S Standard #9  Bracelets  I 
mBIT 2020S Advanced #6  Gorilla Grouping  II 
mBIT 2020S Advanced #7  Hen Hackers  III 
mBIT 2020S Advanced #8  Platypus Puddles  IV 
mBIT 2020F Standard #3  Explorers  I 
mBIT 2020F Advanced #2  Stone Piles  II 
mBIT 2020F Advanced #5  Locked in the Past  III 
mBIT 2020F Advanced #6  Night of the Candles  II 
mBIT 2020F Advanced #7  Gemstones  IV 
mBIT 2020F Advanced #8  Flock of Rams  III 
mBIT 2020F Advanced #11  Sphinx Economics^{1}  V 
mBIT 2020F Advanced #12  Building Atlantis  V 
mBIT 2021S Standard #9  Grid Shuffling  III 
mBIT 2021S Standard #11  Rabbit Subtraction  III 
mBIT 2021S Advanced #5  Knockout Tournament  III 
mBIT 2021S Advanced #6  Squid Art  IV 
mBIT 2021S Advanced #8  Future Gadget Lab  IV 
mBIT 2021S Advanced #9  Immortality Potion  IV 
mBIT 2021S Advanced #10  Luigi’s Mansion  V 
mBIT 2021S Advanced #12  Pillar Path  V 
mBIT 2022S Advanced #8  Rating Report  III 
Math
Contest  Description  Difficulty 

MBMT 2020 Team #7  Even sum but not even product  I 
MBMT 2020 Team #11  Maximum selfintersections of an ant path  I 
MBMT 2020 Team #20  Rotationally distinct but not symmetric  II 
MBMT 2020 Team #22  Product of solutions  II 
MBMT 2020 Team #31  Growing spike sequence  II 
HMMT 2021 Nov General #5  Probability three chords make a triangle  II 
HMMT 2021 Nov General #8  Simple routes on eight points  III 
HMMT 2021 Nov Guts #20  Three mutuallyattacking queens on a chessboard  I 
HMMT 2021 Nov Guts #26  Binary tree sequences  IV 
HMMT 2022 Feb Combo #3  HMMT string operations  II 
HMMT 2022 Feb Combo #7  Spiral paths  IV 
HMMT 2022 Feb Combo #8  Smallest common prefix sum  V 
HMMT 2022 Feb Guts #11  Inscribed dodecagon  I 
HMMT 2022 Feb Guts #24  Manhattan distance in Sierpinski Carpet  IV 
HMMT 2022 Feb Guts #26  Random war card game  V 
HMMT 2022 Nov Team #2  Covering a unit disk  I 
HMMT 2022 Nov Team #10  Circle painting  IV 
HMMT 2023 Feb Guts #25  Spikiness  IV 

Cowritten with Timothy Qian. This problem was featured on FiveThirtyEight’s puzzling blog, The Riddler. ↩