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g2701_2800.s2718_sum_of_matrix_after_queries.readme.md Maven / Gradle / Ivy

2718\. Sum of Matrix After Queries

Medium

You are given an integer `n` and a **0-indexed** **2D array** `queries` where queries[i] = [typei, indexi, vali].

Initially, there is a **0-indexed** `n x n` matrix filled with `0`'s. For each query, you must apply one of the following changes:

*   if typei == 0, set the values in the row with indexi to vali, overwriting any previous values.
*   if typei == 1, set the values in the column with indexi to vali, overwriting any previous values.

Return _the sum of integers in the matrix after all queries are applied_.

**Example 1:**

![](https://assets.leetcode.com/uploads/2023/05/11/exm1.png)

**Input:** n = 3, queries = [[0,0,1],[1,2,2],[0,2,3],[1,0,4]]

**Output:** 23

**Explanation:** The image above describes the matrix after each query. The sum of the matrix after all queries are applied is 23.

**Example 2:**

![](https://assets.leetcode.com/uploads/2023/05/11/exm2.png)

**Input:** n = 3, queries = [[0,0,4],[0,1,2],[1,0,1],[0,2,3],[1,2,1]]

**Output:** 17

**Explanation:** The image above describes the matrix after each query. The sum of the matrix after all queries are applied is 17.

**Constraints:**

*   1 <= n <= 104
*   1 <= queries.length <= 5 * 104
*   `queries[i].length == 3`
*   0 <= typei <= 1
*   0 <= indexi < n
*   0 <= vali <= 105