Find Indices With Index and Value Difference II

Given an integer array and thresholds k (indexDifference) and t (valueDifference), find any pair of indices i, j with |i−j| ≥ k and |nums[i]−nums[j]| ≥ t, or return [-1,-1] if none exist. The algorithmic challenge is to do this efficiently for n up to 1e5 (e.g., with ordered sets, bucketization, or sorting) rather than brute-force O(n^2).