// Height of segment tree int x = (int)(ceil(log2(n))); // Maximum size of segment tree int max_size = 2 * (int)pow(2, x) - 1; st.resize(max_size); // Important!: st.resize(2 * n - 1); 是错误的 因为线段树不一定是完全二叉树 initialize(0, 0, n - 1, nums); } ...
第二部分---树状数组:https://leetcode.com/tag/binary-indexed-tree/ 【218】The Skyline Problem(2019年1月22日) 本题想不出来用树状数组怎么做,最后自己yy出来了一种写法来做。 给了一堆大楼,给了每个楼的坐标和高度,用 (l, r, h) 表示,返回所有的 key points, A key point is the left endpoint...
https://leetcode.com/problems/range-sum-query-mutable/discuss/75711/C++-Segment-Treeupdate-and-sum-are-both-O(logn) structSegmentTreeNode {intstart, end, sum; SegmentTreeNode*left; SegmentTreeNode*right; SegmentTreeNode(inta,intb):start(a),end(b),sum(0),left(NULL),right(NULL){} };cl...
the table structuring key of its ancestor in the tree structure that has the same complex type. Such an element is thus not expanded further in the Element Declaration Table. The table structuring key of the ancestor is called self-containment key. It is also used for retrieving a child desc...
Summary of Binary Indexed Tree: Binary Index Tree参见:https://www.youtube.com/watch?v=CWDQJGaN1gY Compare Segment Tree vs Binary Indexed Tree Segment Tree: Time: O(N)build, O(logN)search, O(logN) update, space: O(NlogN) Binary Indexed Tree: ...