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난이도: Medium 문제 설명You are given a 0-indexed integer array arr, and an m x n integer matrix mat. arr and mat both contain all the integers in the range [1, m * n]. Go through each index i in arr starting from index 0 and paint the cell in mat containing the integer arr[i]. Return the smallest index i at which either a row or a column will be completely painted in mat. 문제 예제Example 1:Input: arr = [..

문제 설명Given an m x n integer matrix heightMap representing the height of each unit cell in a 2D elevation map, return the volume of water it can trap after raining. 문제 예제Example 1:Input: heightMap = [[1,4,3,1,3,2],[3,2,1,3,2,4],[2,3,3,2,3,1]]Output: 4Explanation: After the rain, water is trapped between the blocks.We have two small ponds 1 and 3 units trapped.The total volume of water trapped is ..