give nary tree return level order traversal node valuesNaryTree input serialization represent level order traversal group child separate null value see example example 1input root 1null324null56output 132456example 2input root 1null2345nullnull67null8null910nullnull11null12null13nullnull14output 1234567891011121314 ConstraintsThe height nary tree equal 1000the total number node 0 104