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Check If Binary Tree Has Duplicate Values

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code_1.cpp
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Check if a Binary Tree (not BST) has duplicate values

Input : Root of below tree
         1
       /   \
      2     3
             \
              2
Output : Yes
Explanation : The duplicate value is 2.

Input : Root of below tree
         1
       /   \
     20     3
             \
              4
Output : No
Explanation : There are no duplicates.