hard Two Pointers
Trapping Rain Water
Given an elevation map `height` (width 1 per bar), return how many units of rain water it can trap. Example: [0, 1, 0, 2, 1, 0, 1, 3, 2, 1, 2, 1] → 6.
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Given an elevation map `height` (width 1 per bar), return how many units of rain water it can trap. Example: [0, 1, 0, 2, 1, 0, 1, 3, 2, 1, 2, 1] → 6.