1-高频2-中频3-低频 1-高频 数组Array广度优先BFS深度优先DFS回溯BackTracking二分查找BinarySearch树Tree二叉搜索树BinarySeaarchTree双指针DoblePointer滑动窗口SlidingWindow堆Heap队列Queue栈Stack哈希表Hash链表LinkedList排序Sort 2-中频动态规划DynamicProgramming 扫描线SweepLine字典树Trie并查集UnionFind 3-低频最短路径 线段树树装数组最小生成树