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Given an array **arr[]** of **N** non-negative integers representing the height of blocks. If width of each block is 1, compute how much water can be trapped between the blocks during the rainy season.

**Example 1:**

**Input:
**N = 6
arr[] = {3,0,0,2,0,4}
**Output:
**10**
Explanation:
**

**Example 2:**

**Input:
**N = 4
arr[] = {7,4,0,9}
**Output:
**10**
Explanation:
**Water trapped by above
block of height 4 is 3 units and above
block of height 0 is 7 units. So, the
total unit of water trapped is 10 units.

**Example 3:**

**Input:
**N = 3
arr[] = {6,9,9}
**Output:
**0**
Explanation:
**No water will be trapped.

**Your Task:**

You don't need to read input or print anything. The task is to complete the function **trappingWater**() which takes arr[] and N as input parameters and returns the total amount of water that can be trapped.

**Expected Time Complexity: **O(N)

**Expected Auxiliary Space: **O(N)

**Constraints:**

3 __<__ N __<__ 10^{6}

0 __<__ A_{i} __<__ 10^{8}

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Trapping Rain Water

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