Sum At Level K : Input problem

#1

I am facing no Element Exception because i am not able to input the value of level.
Please look into the code.

#2
#3

Ok I have managed that but I am facing error in just 1 test case.

#4

Please look into the code.

#5

your code showing wrong o/p for the given test case.
20 2
40 1
204 1
65 1
24 0
60 2
92 1
21 0
65 1
85 0
3

o/p= 171