Wrong Answer in 3d Structure problem

#1

Please check my code. It is working fine for given test case but giving WA on all the test cases on submitting.

Code link: https://ide.codingblocks.com/s/266548

#2

@HemantKumar
what if update query occur for same set of x,y and z more than once. You are adding values in that case. But you have to first delete existing value and then update it.

#3

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