Merge point

int FindMergeNode(Node headA, Node headB) {
  Node currentA = headA;
  Node currentB = headB;

  // Do till the two nodes are the same
  while (currentA != currentB) {
    // If you reached the end of one list start at the beginning of the other
    // one currentA
    if (currentA.next == null) {
      currentA = headA;
    } else {
      currentA = currentA.next;
    }
    // currentB
    if (currentB.next == null) {
      currentB = headB;
    } else {
      currentB = currentB.next;
    }
  }
  return currentB.data;
}

Source: stackoverflow.com

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