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Given a binary tree and two node values your task is to find the minimum distance between them.

**Example 1:**

**Input:
**1
/ \
2 3
a = 2, b = 3**
****Output: **2**
Explanation: **The tree formed is:
1
/ \
2 3
We need the distance between 2 and 3.
Being at node 2, we need to take two
steps ahead in order to reach node 3.
The path followed will be:
2 -> 1 -> 3. Hence, the result is 2.

**Your Task:**

You don't need to read input or print anything. Your task is to complete the function **findDist() **which takes the **root **node of the Tree and the two node values **a** and **b** as input parameters and returns the minimum distance between the nodes represented by the two given node values.

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

**Expected Auxiliary Space: **O(Height of the Tree).

**Constraints:**

1 <= Number of nodes <= 10^{4}

1 <= Data of a node <= 10^{5}

**Note:**The **Input/Ouput** format and **Example** given are used for system's internal purpose, and should be used by a user for **Expected Output** only. As it is a function problem, hence a user should not read any input from stdin/console. The task is to complete the function specified, and not to write the full code.

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Min distance between two given nodes of a Binary Tree

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