I am not getting any output

#1
#2

I have done some editing but the approach you are using in your zigzag function is not right, as in your while loop you have to check if s1 and s2 until your s1 & s2 is not empty so you have to add root in s2 too

#3

Submit this code, it’s giving 100% result. It’s your code only have just removed s2 condition and it get’s accepted.

#4

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