基于MFC的超市选址问题。用户可以点击屏幕地图任意位置设置居民住址，系统会根据快排序、中值算法找出最佳的超市修建位置。-MFC-based supermarket siting problems. Users can click anywhere on the map screen settings resident address, the system will soon sort out the best value in the algorithm to build a supermar