InterviewBit Problems   Level Order : Unsolved

About the Level Order : Unsolved category (1)
Adding unnecessary vectors at last, Please solve the error in the code (2)
Question of trees (3)
Can anyone explain, why this is showing runtime error? (2)
Why I am getting Memory Limit Exceeded...any help? (3)
Testcase not able to capture result correctly (1)
Error in one test case (1)
Unable to find error (1)
Empty tree test case not included (1)
System output issue (6)
Bug in reading input / printing output (1)
Problem in answer checking (1)
This problem has bug in output (1)