需要元素值：栈存值，或答案存索引后用 nums[res[i]] 取值。
英國超市將巧克力鎖進防盜盒阻止「訂單式」偷竊
，这一点在搜狗输入法2026中也有详细论述
Guy Edwardes SDNPA
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.