The simplest approach is to check every single point. Compute the distance from the user's location to every restaurant in the database, keep the ones that are close enough, and throw away the rest.
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With a thousand points, you barely notice the delay. With a million, you're doing a million distance calculations for every single query. On a phone updating the map as the user scrolls, that's untenable.
德索托曾经亲自参与秘鲁上世纪90年代初的改革，既是一位理论扎实的经济学家，也是一个历史改革进程的实践者，我们可以从三个方面来理解他的思想体系。