class defaultimport { default } from "https://deno.land/x/masx200_leetcode_test@10.6.5/range-sum-query-2d-mutable/index.ts"; Constructorsnewdefault(matrix: number[][])MethodssumRegion(row1: number,col1: number,row2: number,col2: number,): numberupdate(row: number,col: number,val: number,)