Commit 26239f9

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Refactor dynamic programming approach of Trapping Rain Water problem.

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Original file line number	Diff line number	Diff line change
`@@ -74,7 +74,7 @@ the sides minus its own height.`
`74`	`74`
`75`	`75`	- Initialize `answer = 0`
`76`	`76`	`- Iterate the array from left to right:`
`77`		- - Initialize `max_left = 0 and `max_right = 0`
	`77`	+ - Initialize `max_left = 0` and `max_right = 0`
`78`	`78`	- Iterate from the current element to the beginning of array updating: `max_left = max(max_left, height[j])`
`79`	`79`	- Iterate from the current element to the end of array updating: `max_right = max(max_right, height[j])`
`80`	`80`	- Add `min(max_left, max_right) − height[i]` to `answer`

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