Can you please mention the mistake due to which my program is giving Run Time Error?
Run Time Error in all the Test Cases
hello @mrpareek

here dont call build function
instead create a new node with value c1 , c2 and assing there address to ans->left and ans->right respectively
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Thank You brother…I wasn’t able to just see it 
Bro can you please help me with another problem…I have asked for it but haven’t received a response till now.
i am not seeing ur doubt in the portal ,probably some other ta is taking that
u can raise a different doubt for the same issue
So for that I will have to click on resolved?
no ,create a fresh doubt thread (as u did for this doubt)
You can check now,I have raised a doubt