what if we want the index of elements of array which containing 0 ??
Subarray with sum 0
s.find(pre)!=s.end() what this line means ?? Is not required to put a loop to check element is present from begin to end
no it simply finds if the element is present in the map or not
it returns the end of container if the pre is not found
else it returns a pointer to that key
so if
s.find(pre) == s.end()
then key ( pre ) is absent
else
returns reference to pre
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