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Overview
Chao Xu |许 ( xǔ ) 超 ( chāo ). I'm an Associate Professor at UESTC, a member of the Algorithms and Logic Group. My research interests are algorithms, combinatorial optimization and computational geometry. I'm also interested in more applied problems with nice theoretical components. Here is my CV.
News
Traditional vs Roth IRA under fixed amount of investment
I've read a lot of articles on Traditional vs Roth IRA. One can do a serious mathematical analysis of which one is better, given that you want to invest a total of x income into the account for a particular year. Money in excess of x will be put in a norm
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Word break with cost
Problem1 Given a set of strings W, a cost function c:Wto R and a string s. Find elements w_1,ldots,w_kin W such that s=w_1ldots w_k, and sum_{i=1}k c(w_i) is minimized. This problem is a generalization of the word break problem on leetcode. Many algorithm
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Bounds on number of cuts
Consider we have an undirected graph G=(V,E) of n vertices, and there are positive cost c:Eto R+ on the edges. We define c(F)=sum_{ein F}c(e), to be the cost (value) of Fsubset E. Let mathcal{P} be a partition of V where each partition class is non-empty.
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Maximize Cash Back
Credit cards often offers rewards for purchases. For example, a card that gives 5% cash back for grocery stores. Also, credit cards often can be used to buy gift cards for specific stores. For example, one can use Chase Ink Cash (CIC) and go to Staples an
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The value of a gift card in beancount
I'm using beancount to do accounting. In beancount, you are allowed to have commodities. One can view gift card as commodity, but also as a currency. Say, I bought an $100 Amazon gift card for $90, I would write 100 AMAZON {0.9 USD}, which means 100 units
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