Given an array of integers, find the maximum sum of a subarray.
class Node: def __init__(self, data): self.data = data self.next = None
Given a linked list, find the middle element.
Given a string, check if it's a palindrome or not.
print(first_non_repeating_char("aabbc")) # Output: "c"
Example: Input - "aabbc", Output - "c"
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