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import java.util.*; public class Main{ public static Node findchain(Node chain1, Node chain2) { int len1 = getLength(chain1); int len2 = getLength(chain2); Node ptr1 = chain1; Node ptr2 = chain2; if (len1 > len2) { int diff = len1 - len2; while (diff-- > 0) ptr1 = ptr1.next; } else { int diff = len2 - len1; while (diff-- > 0) ptr2 = ptr2.next; } while (ptr1 != null && ptr2 != null && ptr1 != ptr2) { ptr1 = ptr1.next; ptr2 = ptr2.next; } Node mergePoint = ptr1; int beforeMerge1 = getDistance(chain1, mergePoint); int beforeMerge2 = getDistance(chain2, mergePoint); Node result = null; if (beforeMerge1 < beforeMerge2 || (beforeMerge1 == beforeMerge2)) { result = cloneUntil(chain1, mergePoint); appendTail(result, mergePoint); } else { result = cloneUntil(chain2, mergePoint); appendTail(result, mergePoint); } return result; } private static int getLength(Node head) { int count = 0; while (head != null) { head = head.next; count++; } return count; } private static int getDistance(Node head, Node stop) { int count = 0; while (head != stop) { head = head.next; count++; } return count; } private static Node cloneUntil(Node head, Node stop) { if (head == stop) return null; Node newHead = new Node(head.value); Node current = newHead; head = head.next; while (head != stop) { current.next = new Node(head.value); current = current.next; head = head.next; } return newHead; } private static void appendTail(Node head, Node tailStart) { if (head == null) return; while (head.next != null) { head = head.next; } head.next = tailStart; } }

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def getMaximumSum(matrix, k): global idx import heapq from collections import deque n = len(matrix) rows = [deque(row) for row in matrix] heap = [] for i in range(n): if rows[i]: heapq.heappush(heap, (-rows[i][0], i, True)) heapq.heappush(heap, (-rows[i][-1], i, False)) ans= 0 for _ in range(k): while heap: val, idx, is_left = heapq.heappop(heap) if rows[idx]: if is_left and rows[idx][0] == -val: ans += rows[idx].popleft() break elif not is_left and rows[idx][-1] == -val: ans += rows[idx].pop() break if rows[idx]: heapq.heappush(heap, (-rows[idx][0], idx, True)) heapq.heappush(heap, (-rows[idx][-1], idx, False)) return ans getMaximumSum✅✅ CISCO✅