Reverse Sign in Intervals

Given an integer array arr and a list of intervals intervals, each represented by [i, j], reverse the sign of all values within each interval. After processing all intervals, return the resulting array. Example Input: arr = [1, -5, 3, 7, -2], intervals = [[0, 2], [3, 4]] Output: [-1, 5, -3, -7, 2] Constraints 1 <= arr.length <= 10^5 -10^9 <= arr[i] <= 10^9 1 <= intervals.length <= 10^4 0 <= i <= j < arr.length Example Input 5 1 -5 3 7 -2 2 0 2 3 4