- AdjustTraingle 如果只是修改slice里的元素，不需要传slice的指针； - 如果要往slice里append或让slice指向新的子切片，则需要传slice指针 */.

This example inserts several ints into an IntHeap, checks the minimum, and removes them in order of priority.

实现大顶堆.

定义Item 用堆实现数据优先级.

An IntHeap is a min-heap of ints.

优先级队列需要实现heap的interface.