Leetcode 1266. Minimum Time Visiting All Points

Given an ordered list of integer-coordinate points, find the minimum total seconds to visit them in sequence when in one second you may move 1 unit horizontally, vertically, or diagonally (a diagonal counts as one step in both axes). The core insight is that the time between two consecutive points is the Chebyshev distance (max(|dx|,|dy|)), so sum that over all adjacent pairs.