Check Subarray with sum Zero

#1

s.find(pre) != s.end()
how we can say by this that pre is present or not

#2

we can also use if(pre==0 or s.count(pre)

#3

Yes both ways are ok.
if you want to use find function then s.find(pre) != s.end() this is the format

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#4

s.find(pre) return address of pre position so how we can compare with s.end()

#5

By default if the key is not found in the map, then it points to the end of the map ie. s.end()

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