Problem sets

UVA Online Judge https://onlinejudge.org

USACO Training Program Gateway https://train.usaco.org

PKU Judge Online http://poj.org

Problem Classification

Method to Solve https://cpbook.net/methodstosolve from https://www.comp.nus.edu.sg/~stevenha/index.html

The Algorithmist https://algorithmist.com/wiki/Main_Page

Lucky 貓的 UVA 園地(原站連不上) http://www3.tcgs.tc.edu.tw/~sagit/luckycat/

Reference： 《大學程式能力檢定 CPE 秘笈》