problem hint, algorithm, or source code avaliable: Algorithms for Valladolid Online Judge Problems(link miss); The ACM Programming Contest Solutions Archive; skaven collected source code(link miss); SmallRedBean's source code; CharlieL's source code; L'angolo del programmatore(non-English); ACM solutions download area(link miss); Solving status of ICPC Problem Set Archive(japanese); ACM OJ Solutions; ACM/ICPC blah blah(japanese); archive of solved problem sets; 星子的 ACM 小窩 Hoshiko's ACM(chinese); Iwen's acm page; Online Judge System(japanese); zhouer's source code; ACM Mid-Central Regional Programming Contest, Regional Chief Judges' Page; 小尹兒的 Acm 首頁; World of Seven; Beginner ACM; ICPC-L forum HP

programming contest related site: OIBH; 編程之道; 福建信息學奧林匹克; sqr(5); 程式設計資源網：試題蒐集; 台交賽2

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acmicpc problem archive

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other online judge: Sigapo Online Judge; Ural State University Problem Set Archive with Online Judge System; 中國科學技術大學

bbs board: littlejohn.twbbs.org, Final_Web; ofo.twbbs.org, Prob_solve, ...; summer.ck.tp.edu.tw, Programming; ice.ntnu.edu.tw, programming; bbs.cs.tku.edu.tw, solving