Tcs Coding Questions - 2021

return None

# Create a sample linked list: 1 -> 2 -> 3 -> 4 -> 5 head = Node(1) head.next = Node(2) head.next.next = Node(3) head.next.next.next = Node(4) head.next.next.next.next = Node(5) Tcs Coding Questions 2021

class Node: def __init__(self, data): self.data = data self.next = None return None # Create a sample linked list:

return count

def first_non_repeating_char(s): char_count = {} for char in s: if char in char_count: char_count[char] += 1 else: char_count[char] = 1 Tcs Coding Questions 2021

for num in arr: complement = target_sum - num if complement in seen: count += 1 seen.add(num)