设有一个背包可以放入的物品重量为S，现有n件物品，重量分别是w1，w2，w3，…wn。问能否从这n件物品中选择若干件放入背包中，使得放入的重量之和正好为S。如果有满足条件的选择，则此背包有解，否则此背包问题无解。

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Communications of the ACM is the flagship publication of the ACM and one of the oft-cited magazines in the computing field. Established in 1957 as a vehicle for ACM members to communicate their research findings and ideas, Communications has flourished into the premier computing magazine, internationally renowned and respected for its coverage of both existing and emerging technologies. Every month Communications brings its readers the latest in technology trends as written by the very creators and innovators of those technologies. Our news coverage and commentaries offer engaging perspectives involving diverse topics and the impact of the technologies we cover. Most issues include a special section spotlighting a particular technology in detail with the help of many of the leading experts in the field. Every issue includes a rich assortment of feature articles that examine a vast array of technical subjects and implementations all written for a very broad-based audience of computing professionals. Our recognized roster of columnists provide valuable professional insight and wisdom regarding such topics as legal issues, business strategies, professional growth, programming acumen, safety risks, and political matters, among others. The prestige that Communications enjoys today has been built on a strong foundation of the highest quality editorial and ACM's steadfast dedication to advancing the arts, sciences, and applications of information techology.

本文以竞赛心态的调整为开端，以常数时间优化为基础，以数学分析与猜想为指导思想，以非完美算法为主要策略，以搜索为最后的万能策略，讲述信息学竞赛 中“骗分”的若干策略，再进行实战演习，说明“骗分”的强大功力。

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