Two testcases are going wrong

#1
#2

for input

1 2 3 -1 4 -1 5 -1 -1 -1 6 -1 7 -1 8 -1 -1
desired
o/p
2 1 3 5 6 7 8

ur output is wrong

this question can be done easily using map
store the first element of each new level ( vertical level)

#3
#4

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