https://jeanphilogong.github.io/jeanblog/tags/prefix-max/Recent content in Prefix Max on Jeanphilo BlogHugo -- 0.168.0en-usSat, 24 Jan 2026 10:40:53 +0800https://jeanphilogong.github.io/jeanblog/alg/leetcode/hot100/42-trapping-rain-water/Sat, 24 Jan 2026 10:40:53 +0800https://jeanphilogong.github.io/jeanblog/alg/leetcode/hot100/42-trapping-rain-water/Start with one position, derive boundary arrays and an O(1)-space two-pointer solution, then connect the same boundary model to a monotonic stack.