0042-trapping-rain-water-2.md Reworded.

gazeldx · gazeldx · commit d01f1bc846b0 · 2024-12-10T17:53:13.000+08:00
diff --git a/README.md b/README.md
@@ -67,6 +67,6 @@ After finishing one category of questions, you can study another category to imp
 - [739. Daily Temperatures](problems/0739-daily-temperatures.md)
 - [496. Next Greater Element I](problems/0496-next-greater-element-i.md)
 - [42. Trapping Rain Water](problems/0042-trapping-rain-water.md)
-- [84. Largest Rectangle in Histogram](0084-largest-rectangle-in-histogram.md)
+- [84. Largest Rectangle in Histogram](problems/0084-largest-rectangle-in-histogram.md)
 
 More LeetCode problems will be added soon...
diff --git a/problems/0042-trapping-rain-water-2.md b/problems/0042-trapping-rain-water-2.md
@@ -33,9 +33,7 @@ This problem can be solved using **Monotonic Stack**.
 ### Solution 2
 This solution will follow **Monotonic Stack**'s common rule: **only calculating when `pop()` is happening**.
 
-This common rule can be applied to calculating result for most of the **Monotonic Stack** problems.
-
-Sometimes it could be hard to understand, but it does work.
+This common rule can be applied to calculating result for **most** of the **Monotonic Stack** problems.
 
 ![](../images/0042.png)
 
@@ -155,7 +153,7 @@ var trap = function (heights) {
       const rightHeight = heights[i]
       const heightGap = Math.min(leftHeight, rightHeight) - heights[poppedIndex]
       const width = i - indexStack.at(-1) - 1
-      result += heightGap * width;
+      result += heightGap * width
     }
 
     indexStack.push(i)
