SP20644 ZQUERY - Zero Query

[English](/problems/ZQUERY/en) [Vietnamese](/problems/ZQUERY/vn)Given an array having **N** elements, each element is either **-1** or **1**. You have **M** queries, each query has two numbers **L** and **R**, you have to answer the length of the longest subarray in range **L** to **R** (inclusive) that its sum is equal to 0.

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