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Working in the silver mining industry for more than two decades.

• 2020: advisor for GT ICPC team that placed 2nd at the North American Championship.
• 2018: silver medal distributor at IOI.
• 2018: NAIPC online open division 2nd place team, after tying first place team in problems AND penalty minutes.
• 2017: TLE `17 December 2nd place.
• 2017: DMOPC `17 December 2nd place.
• 2017: silver medal distributor at IOI.
• 2015: silver medal distributor at IOI.
• 2014: deputy leader for US IOI team, whose total score ranked 2nd overall.
• 2013: second input-sparsity time framework for solving regression problems.
• 2010: second nearly-linear time Laplacian solver, running time: ~m\log^2n~.
• 2009: Croatian Olympiad in Informatics online round 2nd place.
• 2008: Waterloo Local Programming Contest, Spring, 2nd place.
• 2008: TopCoder SRM 405 2nd place.
• 2007: Waterloo Local Programming Contest, Fall 1, 2nd place.
• 2006: IOI silver medal.
• 2006: USAICO (USACO Camp) silver medal.
• 2006: CCC stage 2 2nd place.
• 2006: ECOO regional contest 2nd place.
• 2006: CMC Euclid contest group 2.
• 2005: IMO silver medal.
• 2005: ECOO 2nd place.
• 2005: CMO 2nd place.
• 2005: CCC stage 2 2nd place.
• 2004: IOI silver medal.
• 2004: ECOO boardwide contest 2nd place.
• 2003: ECOO regional contest 2nd place.
• 2002: CCC Junior division group 2.
• 2001: CMC Pascal contest 2nd place.
• 1999: Jiangsu NOIP elementary school division 2nd place.