Use sweep algorithm to build initial solutions, and then, improve the solutions by 3 local search algorithms, such as 2-opt, 1-exchange, cross heuristics.

通过扫描算法构建初始解，应用2优化、1交换、交叉算法3个邻域搜索算法优化初始解。

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People had various reasons for wanting to opt out of Facebook search.

FORBES: Facebook Exposes 10 Million Previously Hidden Profiles To Its New Graph Search

Further, any French newspaper can opt out of the search engine just by making a minor change to the robots.txt of their own site.

FORBES: The French Don't Seem To Understand This Economics Of Google Thing Really, Do They?

Newly discovered code in a Google page hints that it might just become part of the standard web search interface -- provided you opt to turn it on, of course.

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