# How does a segment tree work?

How does a segment tree work?

## How does a segment tree work?

Construction of Segment Tree from given array and every time we divide the current segment into two halves(if it has not yet become a segment of length 1), and then call the same procedure on both halves, and for each such segment, we store the sum in the corresponding node.

## How do you implement a segment tree in Java?

The following pseudo-code tackles the issue.

1. int getSum(nde, x, y)
2. {
3. if (the range of the node is within x and y)
4. return value of the node.
5. else if (the range of the node is outside of x and y)
6. return 0.
7. else.
8. return getSum(nde left child, x, y) +

What is meant by segment tree?

In computer science, a segment tree, also known as a statistic tree, is a tree data structure used for storing information about intervals, or segments. It allows querying which of the stored segments contain a given point.

What is the space complexity of segment tree?

Size of Segment Tree (Space Complexity) Total number of leaf nodes is at least N. Total number of internal nodes = N-1. So, total number of nodes = 2*N-1. But generally, to build a segment tree over an array of size N, we use a tree of 4*N nodes.

### What is lazy propagation in segment tree?

Lazy propagation is a range update and query optimized implementation of a segment tree that performs both operation O(logN) time. *In short, as the name suggests, the algorithm works on laziness for what is not important at the time. Don’t update a node until needed, which will avoid the repeated sharing.

### What is the advantage of segment tree?

Segment tree allows processing interval or range queries in logarithmic time, and is thus used when there is a need to process multiple such queries.

What is a segment tree Java?

Segment Tree is also a binary tree, but it is used to solve specific problems with better time complexity. Similar to the heap, the segment tree in Java is also represented with the help of an array.