---
title: 2.19 ✅ Binary Indexed Tree
type: docs
weight: 19
---

# Binary Indexed Tree

![](https://img.halfrost.com/Leetcode/Binary_Indexed_Tree.png)

| No.      | Title | Solution | Difficulty | TimeComplexity | SpaceComplexity |Favorite| Acceptance |
|:--------:|:------- | :--------: | :----------: | :----: | :-----: | :-----: |:-----: |
|0218|The Skyline Problem|[Go]({{< relref "/ChapterFour/0200~0299/0218.The-Skyline-Problem.md" >}})|Hard||||37.8%|
|0307|Range Sum Query - Mutable|[Go]({{< relref "/ChapterFour/0300~0399/0307.Range-Sum-Query-Mutable.md" >}})|Medium||||38.2%|
|0315|Count of Smaller Numbers After Self|[Go]({{< relref "/ChapterFour/0300~0399/0315.Count-of-Smaller-Numbers-After-Self.md" >}})|Hard||||42.0%|
|0327|Count of Range Sum|[Go]({{< relref "/ChapterFour/0300~0399/0327.Count-of-Range-Sum.md" >}})|Hard||||36.0%|
|0493|Reverse Pairs|[Go]({{< relref "/ChapterFour/0400~0499/0493.Reverse-Pairs.md" >}})|Hard||||28.8%|
|1157|Online Majority Element In Subarray|[Go]({{< relref "/ChapterFour/1100~1199/1157.Online-Majority-Element-In-Subarray.md" >}})|Hard||||41.9%|
|1649|Create Sorted Array through Instructions|[Go]({{< relref "/ChapterFour/1600~1699/1649.Create-Sorted-Array-through-Instructions.md" >}})|Hard||||37.1%|
|------------|-------------------------------------------------------|-------| ----------------| ---------------|-------------|-------------|-------------|


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