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Merge k Sorted Lists

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CodeBlack reactor answered on July 20, 2022 Popularity 7/10 Helpfulness 1/10

answer Merge k Sorted Lists

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Merge k Sorted Lists

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/**
 * Definition for singly-linked list.
 * struct ListNode {
 *     int val;
 *     struct ListNode *next;
 * };
 */


struct ListNode* mergeKLists(struct ListNode** lists, int listsSize){

}

Popularity 7/10 Helpfulness 1/10 Language c

Source: Grepper

Tags: c k merge

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Contributed on Aug 17 2022

CodeBlack reactor

0 Answers Avg Quality 2/10

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merge k sorted lists

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#include <bits/stdc++.h>
using namespace std;

struct Node {
	int data;
	struct Node* next;
};

struct Node* newNode(int data) {
	struct Node* new_node = new Node();
	new_node->data = data;
	new_node->next = NULL;

	return new_node;
}

// 'compare' function used to build
// up the priority queue
struct compare {
	bool operator()(
		struct Node* a, struct Node* b) {
		return a->data > b->data;
	}
};

// Function to merge k sorted linked lists
struct Node* mergeKSortedLists(
			struct Node* arr[], int k)
{
	// Priority_queue 'pq' implemented
	// as min heap with the help of
	// 'compare' function
	priority_queue<Node*, vector<Node*>, compare> pq;

	// Push the head nodes of all
	// the k lists in 'pq'
	for (int i = 0; i < k; i++)
		if (arr[i] != NULL)
			pq.push(arr[i]);
	
	// Handles the case when k = 0
	// or lists have no elements in them
	if (pq.empty())
		return NULL;

	struct Node *dummy = newNode(0);
	struct Node *last = dummy;

	// Loop till 'pq' is not empty
	while (!pq.empty()) {
		// Get the top element of 'pq'
		struct Node* curr = pq.top();
		pq.pop();

		// Add the top element of 'pq'
		// to the resultant merged list
		last->next = curr;
		last = last->next;
	
		// Check if there is a node
		// next to the 'top' node
		// in the list of which 'top'
		// node is a member
		if (curr->next != NULL)
			
		// Push the next node of top node
		// in 'pq'
		pq.push(curr->next);
	}

	// Address of head node of the required merged list
	return dummy->next;
}

// Function to print the linked list
void printList(struct Node* head) {
	while (head != NULL) {
		cout << head->data << " ";
		head = head->next;
	}
}


int main() {
	// Number of linked lists
	int k = 3;
	// Number of elements in each list
	int n = 4;

	// An array of pointers storing the head nodes of the linked lists
	Node* arr[k];

	arr[0] = newNode(1);
	arr[0]->next = newNode(3);
	arr[0]->next->next = newNode(5);
	arr[0]->next->next->next = newNode(7);

	arr[1] = newNode(2);
	arr[1]->next = newNode(4);
	arr[1]->next->next = newNode(6);
	arr[1]->next->next->next = newNode(8);

	arr[2] = newNode(0);
	arr[2]->next = newNode(9);
	arr[2]->next->next = newNode(10);
	arr[2]->next->next->next = newNode(11);

	struct Node* head = mergeKSortedLists(arr, k);
	printList(head);

	return 0;
}

Popularity 9/10 Helpfulness 1/10 Language cpp

Source: favtutor.com

Tags: c++

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Contributed on Aug 08 2022

Itchy Impala

0 Answers Avg Quality 2/10

Merge k Sorted Lists

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var mergeList = function(list1, list2) {
    
    let a = new ListNode()
    let b = a
    while(list1 && list2 ){
        if(list1.val < list2.val){
            a.next = list1
            list1 = list1.next
        }else{
            a.next = list2
            list2 = list2.next
        }
      a= a.next 
        
        
    }
    if(list1){
        a.next = list1
        
    }
    if(list2){
        a.next = list2
        
    }
    
    return b.next
    
};
   


var mergeKLists = function(lists) {
    
if(lists.length === 0){
    return null
}
    
    while(lists.length>1){
        let a = lists.shift()
        let b = lists.shift()
        let merge = mergeList(a,b)
        lists.push(merge)
    }
    
    return lists[0]
    
    
};

Popularity 8/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Jul 20 2022

ABS

0 Answers Avg Quality 2/10

Merge k Sorted Lists

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/**
 * Definition for singly-linked list.
 * struct ListNode {
 *     int val;
 *     ListNode *next;
 *     ListNode() : val(0), next(nullptr) {}
 *     ListNode(int x) : val(x), next(nullptr) {}
 *     ListNode(int x, ListNode *next) : val(x), next(next) {}
 * };
 */
class Solution {
public:
    ListNode* mergeKLists(vector<ListNode*>& lists) {
        
    }
};

Popularity 7/10 Helpfulness 1/10 Language cpp

Source: Grepper

Tags: c++ k merge

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Contributed on Aug 17 2022

CodeBlack reactor

0 Answers Avg Quality 2/10

Merge k Sorted Lists

Comment

/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode() {}
 *     ListNode(int val) { this.val = val; }
 *     ListNode(int val, ListNode next) { this.val = val; this.next = next; }
 * }
 */
class Solution {
    public ListNode mergeKLists(ListNode[] lists) {
        
    }
}

Popularity 6/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: java k merge

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Contributed on Aug 17 2022

CodeBlack reactor

0 Answers Avg Quality 2/10

Merge k Sorted Lists

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/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     public int val;
 *     public ListNode next;
 *     public ListNode(int val=0, ListNode next=null) {
 *         this.val = val;
 *         this.next = next;
 *     }
 * }
 */
public class Solution {
    public ListNode MergeKLists(ListNode[] lists) {
        
    }
}

Popularity 7/10 Helpfulness 1/10 Language csharp

Source: Grepper

Tags: c# k merge

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Contributed on Aug 17 2022

CodeBlack reactor

0 Answers Avg Quality 2/10

Merge k Sorted Lists

Comment

/**
 * Definition for singly-linked list.
 * function ListNode(val, next) {
 *     this.val = (val===undefined ? 0 : val)
 *     this.next = (next===undefined ? null : next)
 * }
 */
/**
 * @param {ListNode[]} lists
 * @return {ListNode}
 */
var mergeKLists = function(lists) {
    
};

Popularity 6/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: javascript k merge

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Contributed on Aug 17 2022

CodeBlack reactor

0 Answers Avg Quality 2/10

Merge k Sorted Lists

Comment

/**
 * Definition for a singly-linked list.
 * class ListNode {
 *     public $val = 0;
 *     public $next = null;
 *     function __construct($val = 0, $next = null) {
 *         $this->val = $val;
 *         $this->next = $next;
 *     }
 * }
 */
class Solution {

    /**
     * @param ListNode[] $lists
     * @return ListNode
     */
    function mergeKLists($lists) {
        
    }
}

Popularity 7/10 Helpfulness 1/10 Language php

Source: Grepper

Tags: k merge php

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Contributed on Aug 17 2022

CodeBlack reactor

0 Answers Avg Quality 2/10

Merge k Sorted Lists

Comment

/**
 * Definition for singly-linked list.
 * class ListNode {
 *     val: number
 *     next: ListNode | null
 *     constructor(val?: number, next?: ListNode | null) {
 *         this.val = (val===undefined ? 0 : val)
 *         this.next = (next===undefined ? null : next)
 *     }
 * }
 */

function mergeKLists(lists: Array<ListNode | null>): ListNode | null {

};

Popularity 7/10 Helpfulness 1/10 Language typescript

Source: Grepper

Tags: k merge typescript ty

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Contributed on Aug 17 2022

CodeBlack reactor

0 Answers Avg Quality 2/10

Merge k Sorted Lists

Comment

-1

# Definition for singly-linked list.
# class ListNode
#     attr_accessor :val, :next
#     def initialize(val = 0, _next = nil)
#         @val = val
#         @next = _next
#     end
# end
# @param {ListNode[]} lists
# @return {ListNode}
def merge_k_lists(lists)
    
end

Popularity 8/10 Helpfulness 1/10 Language ruby

Source: Grepper

Tags: k merge ruby rub

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Contributed on Aug 17 2022

CodeBlack reactor

0 Answers Avg Quality 2/10

Merge k Sorted Lists

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