Linked List Pair Sum

Last Updated : 22 Mar, 2023

Given a linked list, and a number, check if their exist two numbers whose sum is equal to given number. If there exist two numbers, print them. If there are multiple answer, print any of them.

Examples:

Input : 1 -> 2 -> 3 -> 4 -> 5 -> NULL 
        sum = 3
Output : Pair is (1, 2)

Input : 10 -> 12 -> 31 -> 42 -> 53 -> NULL 
        sum = 15
Output : NO PAIR EXIST

Method(Brute force): Iteratively check if their exist any pair or not

Implementation:

C++

// CPP code to find the pair with given sum
#include <bits/stdc++.h>
using namespace std;

/* Link list node */
struct Node {
    int data;
    struct Node* next;
};

/* Given a reference (pointer to pointer)
    to the head of a list and an int,
    push a new node on the front 
    of the list. */
void push(struct Node** head_ref, int new_data)
{
    /* allocate node */
    struct Node* new_node = 
          (struct Node*)malloc(sizeof(struct Node));

    /* put in the data */
    new_node->data = new_data;

    /* link the old list of the new node */
    new_node->next = (*head_ref);

    /* move the head to point to the new node */
    (*head_ref) = new_node;
}

/* Takes head pointer of the linked list and sum*/
int check_pair_sum(struct Node* head, int sum)
{
    struct Node* p = head, *q;
    while (p != NULL) {
    
        q = p->next;
        while (q != NULL) {

           // check if both sum is equal to
           // given sum
           if ((p->data) + (q->data) == sum) {
               cout << p->data << " " << q->data;
               return true;
           }     
           q = q->next;          
        }

        p = p->next;
    }

    return 0;
}

/* Driver program to test above function */
int main()
{
    /* Start with the empty list */
    struct Node* head = NULL;

    /* Use push() to construct linked list*/
    push(&head, 1);
    push(&head, 4);
    push(&head, 1);
    push(&head, 12);
    push(&head, 1);
    push(&head, 18);
    push(&head, 47);
    push(&head, 16);
    push(&head, 12);
    push(&head, 14);

    /* function to print the result*/
    bool res = check_pair_sum(head, 26);
    if (res == false)
        cout << "NO PAIR EXIST";

    return 0;
}

Java

// Java code to find the pair with given sum
import java.util.*;

class GFG {

    /* Link list node */
    static class Node {
        int data;
        Node next;
    };
    static Node head;

    /* Given a reference (pointer to pointer)
        to the head of a list and an int,
        push a new node on the front
        of the list. */
    // Inserting node at the beginning
    static Node push(Node head_ref, int new_data)
    {
        /* allocate node */
        Node new_node = new Node();

        /* put in the data */
        new_node.data = new_data;

        /* link the old list to the new node */
        new_node.next = head_ref;

        /* move the head to point to the new node */
        head_ref = new_node;
        return head = head_ref;
    }

    /* Takes head pointer of the linked list and sum*/
    static boolean check_pair_sum(Node head, int sum)
    {
        Node p = head, q;
        while (p != null) 
        {
            q = p.next;
            while (q != null) 
            {

                // check if both sum is equal to
                // given sum
                if ((p.data) + (q.data) == sum) 
                {
                    System.out.print(p.data + " " + q.data);
                    return true;
                }
                q = q.next;
            }
            p = p.next;
        }
        return false;
    }

    // Driver Code
    public static void main(String[] args)
    {
        /* Start with the empty list */
        head = null;

        /* Use push() to construct linked list*/
        push(head, 1);
        push(head, 4);
        push(head, 1);
        push(head, 12);
        push(head, 1);
        push(head, 18);
        push(head, 47);
        push(head, 16);
        push(head, 12);
        push(head, 14);

        /* function to print the result*/
        boolean res = check_pair_sum(head, 26);
        if (res == false)
            System.out.print("NO PAIR EXIST");
    }
}

// This code is contributed by 29AjayKumar

Python3

# Python3 program for finding the pair with given sum
import math
import sys

# Link list node #


class Node:
    def __init__(self, data):
        self.data = data
        self.next = None
# Given a reference (pointer to pointer) to the head
# of a list and an int, push a new node on the front
# of the list.


def push(head, data):
    if head == None:
        return Node(data)

    # allocate node
    temp = Node(data)

    # link the old list of the new node
    temp.next = head

    # move the head to point to the new node
    head = temp
    return head

# Takes head pointer of the linked list and sum


def check_pair_sum(head, _sum_):
    p = head
    q = None
    while(p):
        q = p.next
        while(q):
            if p.data+q.data == _sum_:
                print("{} {}".format(p.data, q.data))
                return True
            q = q.next
        p = p.next
    return False


# Driver program to test above function
if __name__ == '__main__':

    # Start with the empty list
    head = None

    # Use push() to construct linked list
    head = push(head, 1)
    head = push(head, 4)
    head = push(head, 1)
    head = push(head, 12)
    head = push(head, 1)
    head = push(head, 18)
    head = push(head, 47)
    head = push(head, 16)
    head = push(head, 12)
    head = push(head, 14)

    # function to print the result
    res = check_pair_sum(head, 26)
    if (res == False):
        print("NO PAIR EXIST")

# This code is contributed by Vikash Kumar 37

// C# code to find the pair with given sum
using System;

class GFG {

    /* Link list node */
    public class Node {
        public int data;
        public Node next;
    };
    static Node head;

    /* Given a reference (pointer to pointer)
        to the head of a list and an int,
        push a new node on the front
        of the list. */

    // Inserting node at the beginning
    static Node push(Node head_ref, int new_data)
    {
        /* allocate node */
        Node new_node = new Node();

        /* put in the data */
        new_node.data = new_data;

        /* link the old list to the new node */
        new_node.next = head_ref;

        /* move the head to point to the new node */
        head_ref = new_node;
        return head = head_ref;
    }

    /* Takes head pointer of the linked list and sum*/
    static Boolean check_pair_sum(Node head, int sum)
    {
        Node p = head, q;
        while (p != null) 
        {
            q = p.next;
            while (q != null) 
            {
                // check if both sum is equal to
                // given sum
                if ((p.data) + (q.data) == sum) 
                {
                    Console.Write(p.data + " " + q.data);
                    return true;
                }
                q = q.next;
            }
            p = p.next;
        }
        return false;
    }

    // Driver Code
    public static void Main(String[] args)
    {
        /* Start with the empty list */
        head = null;

        /* Use push() to construct linked list*/
        push(head, 1);
        push(head, 4);
        push(head, 1);
        push(head, 12);
        push(head, 1);
        push(head, 18);
        push(head, 47);
        push(head, 16);
        push(head, 12);
        push(head, 14);

        /* function to print the result*/
        Boolean res = check_pair_sum(head, 26);
        if (res == false)
            Console.Write("NO PAIR EXIST");
    }
}

// This code is contributed by Rajput-Ji

JavaScript

<script>

// JavaScript code to find the pair with given sum

/* Link list node */
class Node {

    constructor()
    {
        this.data = 0;
        this.next = null;
    }
};

var head = null;
/* Given a reference (pointer to pointer)
    to the head of a list and an int,
    push a new node on the front
    of the list. */
// Inserting node at the beginning
function push(head_ref, new_data)
{
    /* allocate node */
    var new_node = new Node();
    /* put in the data */
    new_node.data = new_data;
    /* link the old list to the new node */
    new_node.next = head_ref;
    /* move the head to point to the new node */
    head_ref = new_node;
    return head = head_ref;
}
/* Takes head pointer of the linked list and sum*/
function check_pair_sum(head, sum)
{
    var p = head, q;
    while (p != null) 
    {
        q = p.next;
        while (q != null) 
        {
            // check if both sum is equal to
            // given sum
            if ((p.data) + (q.data) == sum) 
            {
                document.write(p.data + " " + q.data);
                return true;
            }
            q = q.next;
        }
        p = p.next;
    }
    return false;
}
// Driver Code
/* Start with the empty list */
head = null;
/* Use push() to construct linked list*/
push(head, 1);
push(head, 4);
push(head, 1);
push(head, 12);
push(head, 1);
push(head, 18);
push(head, 47);
push(head, 16);
push(head, 12);
push(head, 14);
/* function to print the result*/
var res = check_pair_sum(head, 26);
if (res == false)
    document.write("NO PAIR EXIST");

</script>

Output

14 12

Time complexity: O(n*n)
Auxiliary Space: O(1)

Method 2 (using hashing):

Take a hashtable and mark all element with zero
Iteratively mark all the element as 1 in hashtable which are present in linked list
Iteratively find sum-current element of linked list is present in hashtable or not

Implementation:

C++

// CPP program to for finding the pair with given sum
#include <bits/stdc++.h>
#define MAX 100000
using namespace std;

/* Link list node */
struct Node {
    int data;
    struct Node* next;
};

/* Given a reference (pointer to pointer) to the head
    of a list and an int, push a new node on the front
    of the list. */
void push(struct Node** head_ref, int new_data)
{
    /* allocate node */
    struct Node* new_node = 
            (struct Node*)malloc(sizeof(struct Node));

    /* put in the data */
    new_node->data = new_data;

    /* link the old list of the new node */
    new_node->next = (*head_ref);

    /* move the head to point to the new node */
    (*head_ref) = new_node;
}

/* Takes head pointer of the linked list and sum*/
bool check_pair_sum(struct Node* head, int sum)
{
    unordered_set<int> s;
   
    struct Node* p = head;
    while (p != NULL) {
        int curr = p->data;
        if (s.find(sum - curr) != s.end())
        {
           cout << curr << " " << sum - curr;
           return true;
        }
        s.insert(p->data);
        p = p->next;
    }

    return false;
}

/* Driver program to test above function*/
int main()
{
    /* Start with the empty list */
    struct Node* head = NULL;

    /* Use push() to construct linked list */
    push(&head, 1);
    push(&head, 4);
    push(&head, 1);
    push(&head, 12);
    push(&head, 1);
    push(&head, 18);
    push(&head, 47);
    push(&head, 16);
    push(&head, 12);
    push(&head, 14);

    /* function to print the result*/
    bool res = check_pair_sum(head, 26);
    if (res == false)
        cout << "NO PAIR EXIST";

    return 0;
}

Java

// Java program for finding
// the pair with given sum
import java.util.*;
class GFG {
    static int MAX = 100000;

    /* Link list node */
    static class Node {
        int data;
        Node next;
    };

    static Node head;

    /* Given a reference (pointer to pointer)
    to the head of a list and an int,
    push a new node on the front of the list. */
    static void push(Node head_ref, int new_data)
    {
        /* allocate node */
        Node new_node = new Node();

        /* put in the data */
        new_node.data = new_data;

        /* link the old list of the new node */
        new_node.next = head_ref;

        /* move the head to point to the new node */
        head_ref = new_node;
        head = head_ref;
    }

    /* Takes head pointer of the linked list and sum*/
    static boolean check_pair_sum(Node head, int sum)
    {
        HashSet<Integer> s = new HashSet<Integer>();

        Node p = head;
        while (p != null) 
        {
            int curr = p.data;
            if (s.contains(sum - curr))
            {
                System.out.print(curr + " " + (sum - curr));
                return true;
            }
            s.add(p.data);
            p = p.next;
        }

        return false;
    }

    // Driver Code
    public static void main(String[] args)
    {

        /* Start with the empty list */
        head = null;

        /* Use push() to construct linked list */
        push(head, 1);
        push(head, 4);
        push(head, 1);
        push(head, 12);
        push(head, 1);
        push(head, 18);
        push(head, 47);
        push(head, 16);
        push(head, 12);
        push(head, 14);

        /* function to print the result*/
        boolean res = check_pair_sum(head, 26);
        if (res == false)
            System.out.print("NO PAIR EXIST");
    }
}

// This code is contributed by PrinciRaj1992

Python3

# Python3 program to for finding the pair with given sum
MAX = 100000

''' Link list node '''


class Node:

    def __init__(self, data):
        self.data = data
        self.next = None


''' Given a reference (pointer to pointer) to the head
    of a list and an int, push a new node on the front
    of the list. '''


def push(head_ref, new_data):
    ''' allocate node '''
    new_node = Node(new_data)

    ''' put in the data '''
    new_node.data = new_data

    ''' link the old list of the new node '''
    new_node.next = (head_ref)

    ''' move the head to point to the new node '''
    (head_ref) = new_node

    return head_ref


''' Takes head pointer of the linked list and sum'''


def check_pair_sum(head, sum):
    s = set()
    p = head
    while (p != None):
        curr = p.data
        if((sum - curr) in s):
            print(curr, end=' ')
            print(sum-curr, end='')
            return True
        s.add(p.data)
        p = p.next

    return False


''' Driver program to test above function'''
if __name__ == '__main__':

    ''' Start with the empty list '''
    head = None

    ''' Use push() to construct linked list '''
    head = push(head, 1)
    head = push(head, 4)
    head = push(head, 1)
    head = push(head, 12)
    head = push(head, 1)
    head = push(head, 18)
    head = push(head, 47)
    head = push(head, 16)
    head = push(head, 12)
    head = push(head, 14)

    ''' function to print the result'''
    res = check_pair_sum(head, 26)

    if (res == False):
        print("NO PAIR EXIST")

# This code is contributed by rutvik_56

// C# program for finding
// the pair with given sum
using System;
using System.Collections.Generic;

class GFG {
    static int MAX = 100000;

    /* Link list node */
    public class Node {
        public int data;
        public Node next;
    };

    static Node head;

    /* Given a reference (pointer to pointer)
    to the head of a list and an int,
    push a new node on the front of the list. */
    static void push(Node head_ref, int new_data)
    {
        /* allocate node */
        Node new_node = new Node();

        /* put in the data */
        new_node.data = new_data;

        /* link the old list of the new node */
        new_node.next = head_ref;

        /* move the head to point to the new node */
        head_ref = new_node;
        head = head_ref;
    }

    /* Takes head pointer of the linked list and sum*/
    static Boolean check_pair_sum(Node head, int sum)
    {
        HashSet<int> s = new HashSet<int>();

        Node p = head;
        while (p != null)
        {
            int curr = p.data;
            if (s.Contains(sum - curr))
            {
                Console.Write(curr + " " + (sum - curr));
                return true;
            }
            s.Add(p.data);
            p = p.next;
        }
        return false;
    }

    // Driver Code
    public static void Main(String[] args)
    {

        /* Start with the empty list */
        head = null;

        /* Use push() to construct linked list */
        push(head, 1);
        push(head, 4);
        push(head, 1);
        push(head, 12);
        push(head, 1);
        push(head, 18);
        push(head, 47);
        push(head, 16);
        push(head, 12);
        push(head, 14);

        /* function to print the result*/
        Boolean res = check_pair_sum(head, 26);
        if (res == false)
            Console.Write("NO PAIR EXIST");
    }
}

// This code is contributed by Princi Singh

JavaScript

<script>
      // JavaScript program for finding
      // the pair with given sum
      const MAX = 100000;

      /* Link list node */
      class Node {
        constructor() {
          this.data = 0;
          this.next = null;
        }
      }

      var head = null;

      /* Given a reference (pointer to pointer)
    to the head of a list and an int,
    push a new node on the front of the list. */
      function push(head_ref, new_data) {
        /* allocate node */
        var new_node = new Node();

        /* put in the data */
        new_node.data = new_data;

        /* link the old list of the new node */
        new_node.next = head_ref;

        /* move the head to point to the new node */
        head_ref = new_node;
        head = head_ref;
      }

      /* Takes head pointer of the linked list and sum*/
      function check_pair_sum(head, sum) {
        var s = new Set();

        var p = head;
        while (p != null) 
        {
          var curr = p.data;
          if (s.has(sum - curr))
          {
            document.write(curr + " " + (sum - curr));
            return true;
          }
          s.add(p.data);
          p = p.next;
        }
        return false;
      }

      // Driver Code
      /* Start with the empty list */
      head = null;

      /* Use push() to construct linked list */
      push(head, 1);
      push(head, 4);
      push(head, 1);
      push(head, 12);
      push(head, 1);
      push(head, 18);
      push(head, 47);
      push(head, 16);
      push(head, 12);
      push(head, 14);

      /* function to print the result*/
      var res = check_pair_sum(head, 26);
      if (res == false) document.write("NO PAIR EXIST");
      
      // This code is contributed by rdtank.
    </script>

Output

12 14

Time complexity: O(n)
Auxiliary Space: O(n)

Method 3 (using recursion):

Traverse through each node and find if element Sum-(node->data) is available in remaining linked list or not. If not, current node will not be a part of solution. For each node the list is traversed a single time. So, the overall time complexity is quadratic, but no additional space is required for this solution. Although we are using additional stack space for recursion.

Implementation:

C++

// C++ implementation of the above approach
#include<bits/stdc++.h>
using namespace std;

/* Link list node */
struct Node {
    int data;
    struct Node* next;
};
 
void push(struct Node** head_ref, int new_data)
{
    struct Node* new_node = new Node();
    new_node->data = new_data;
    new_node->next = (*head_ref);
    (*head_ref) = new_node;
}
 
bool findElement(struct Node* head, int element)
{
    if (head == NULL)
    {
        return false;
    }
    else if (head->data == element)
    {
        return true;
    }
    return findElement(head->next, element);
}
 
bool check_pair_sum(struct Node* head, int sum)
{
    bool found = false;
    while (head != NULL)
    {
        found = findElement(head, sum - head->data);
        if (found == true)
        {
            cout<<head->data<<" and "<<(sum-head->data);
            return found;
        }
        head = head->next;
    }
    return found;
}
 
// Driver Code
int main()
{
    /* Start with the empty list */
    struct Node* head = NULL;
     
    /* Use push() to construct linked list*/
    push(&head, 1);
    push(&head, 4);
    push(&head, 1);
    push(&head, 12);
    push(&head, 1);
    push(&head, 18);
    push(&head, 47);
    push(&head, 16);
    push(&head, 12);
    push(&head, 14);
    push(&head, 0);
 
    /* Function to print the result*/
    bool res = check_pair_sum(head, 26);
    if (res == false)
        cout<<"No pair found";
    return 0;
}
// This code is contributed by Yash Agarwal(yashagarwal2852002)

// C++ implementation of the above approach
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>

/* Link list node */
struct Node {
    int data;
    struct Node* next;
};

void push(struct Node** head_ref, int new_data)
{
    struct Node* new_node
        = (struct Node*)malloc(sizeof(struct Node));
    new_node->data = new_data;
    new_node->next = (*head_ref);
    (*head_ref) = new_node;
}

bool findElement(struct Node* head, int element)
{
    if (head == NULL) 
    {
        return false;
    }
    else if (head->data == element) 
    {
        return true;
    }
    return findElement(head->next, element);
}

bool check_pair_sum(struct Node* head, int sum)
{
    bool found = false;
    while (head != NULL) 
    {
        found = findElement(head, sum - head->data);
        if (found == true) 
        {
            printf("%d and %d \n", head->data,
                   sum - head->data);
            return found;
        }
        head = head->next;
    }
    return found;
}

// Driver Code
int main()
{
    /* Start with the empty list */
    struct Node* head = NULL;
    
    /* Use push() to construct linked list*/
    push(&head, 1);
    push(&head, 4);
    push(&head, 1);
    push(&head, 12);
    push(&head, 1);
    push(&head, 18);
    push(&head, 47);
    push(&head, 16);
    push(&head, 12);
    push(&head, 14);
    push(&head, 0);

    /* Function to print the result*/
    bool res = check_pair_sum(head, 26);
    if (res == false)
        printf("No pair found");
    return 0;
}

Java

// Java implementation of the above approach

// Node class
class Node {
    int data;
    Node next;
    Node(int data)
    {
        this.data = data;
        this.next = null;
    }
}

// Function to add new node at the beginning
class LinkedList {
    static Node push(Node head_ref, int new_data)
    {
        Node new_node = new Node(new_data);
        new_node.next = head_ref;
        head_ref = new_node;
        return head_ref;
    }
}

// Function to find an element in the linked list
class Search {
    static boolean findElement(Node head, int element)
    {
        if (head == null) {
            return false;
        }
        else if (head.data == element) {
            return true;
        }
        return findElement(head.next, element);
    }
}

// Function to check if there exists a pair with given sum
class PairSum {
    static boolean check_pair_sum(Node head, int sum)
    {
        boolean found = false;
        while (head != null) {
            found
                = Search.findElement(head, sum - head.data);
            if (found == true) {
                System.out.println(head.data + " and "
                                   + (sum - head.data));
                return found;
            }
            head = head.next;
        }
        return found;
    }
}

// Driver code
class Main {
    public static void main(String[] args)
    {
        // Start with the empty list
        Node head = null;
        // Use push() to construct linked list
        head = LinkedList.push(head, 1);
        head = LinkedList.push(head, 4);
        head = LinkedList.push(head, 1);
        head = LinkedList.push(head, 12);
        head = LinkedList.push(head, 1);
        head = LinkedList.push(head, 18);
        head = LinkedList.push(head, 47);
        head = LinkedList.push(head, 16);
        head = LinkedList.push(head, 12);
        head = LinkedList.push(head, 14);
        head = LinkedList.push(head, 0);

        // Function to print the result
        boolean res = PairSum.check_pair_sum(head, 26);
        if (res == false)
            System.out.println("No pair found");
    }
}
// This code is contributed by divyansh2212

Python3

# Python implementation of the above approach

# Node class
class Node:
    def __init__(self, data):
        self.data = data
        self.next = None

# Function to add new node at the beginning
def push(head_ref, new_data):
    new_node = Node(new_data)
    new_node.next = head_ref
    head_ref = new_node
    return head_ref

# Function to find an element in the linked list
def findElement(head, element):
    if (head == None):
        return False
    elif (head.data == element):
        return True
    return findElement(head.next, element)

# Function to check if there exists a pair with given sum
def check_pair_sum(head, sum):
    found = False
    while (head != None):
        found = findElement(head, sum - head.data)
        if (found == True):
            print(head.data, "and", (sum - head.data))
            return found
        head = head.next
    return found

# Driver code
if __name__ == '__main__':
    # Start with the empty list
    head = None
     
    # Use push() to construct linked list
    head = push(head, 1)
    head = push(head, 4)
    head = push(head, 1)
    head = push(head, 12)
    head = push(head, 1)
    head = push(head, 18)
    head = push(head, 47)
    head = push(head, 16)
    head = push(head, 12)
    head = push(head, 14)
    head = push(head, 0)

    # Function to print the result
    res = check_pair_sum(head, 26)
    if (res == False):
        print("No pair found")

using System;

public class LinkedList
{
    /* Link list node */
    public class Node
    {
        public int data;
        public Node next;
    }

    public static void Push(ref Node head_ref, int new_data)
    {
        Node new_node = new Node();
        new_node.data = new_data;
        new_node.next = head_ref;
        head_ref = new_node;
    }

    public static bool FindElement(Node head, int element)
    {
        if (head == null)
        {
            return false;
        }
        else if (head.data == element)
        {
            return true;
        }
        return FindElement(head.next, element);
    }

    public static bool CheckPairSum(Node head, int sum)
    {
        bool found = false;
        while (head != null)
        {
            found = FindElement(head, sum - head.data);
            if (found == true)
            {
                Console.WriteLine(head.data + " and " + (sum - head.data));
                return found;
            }
            head = head.next;
        }
        return found;
    }

    // Driver Code
    public static void Main()
    {
        /* Start with the empty list */
        Node head = null;

        /* Use Push() to construct linked list*/
        Push(ref head, 1);
        Push(ref head, 4);
        Push(ref head, 1);
        Push(ref head, 12);
        Push(ref head, 1);
        Push(ref head, 18);
        Push(ref head, 47);
        Push(ref head, 16);
        Push(ref head, 12);
        Push(ref head, 14);
        Push(ref head, 0);

        /* Function to print the result*/
        bool res = CheckPairSum(head, 26);
        if (res == false)
            Console.WriteLine("No pair found");
    }
}

JavaScript

Javascript// Javascript program of the above approach
// link list node
class Node{
    constructor(data){
        this.data = data;
        this.next = null;
    }
}

function push(head_ref, new_data){
    let new_node = new Node(new_data);
    new_node.next = head_ref;
    // head_ref = new_node;
    return new_node;
}

function findElement(head, element){
    if(head == null) return false;
    else if(head.data == element) return true;
    return findElement(head.next, element);
}

function check_pair_sum(head, sum){
    let found = false;
    while(head != null){
        found = findElement(head, sum - head.data);
        if(found == true){
            document.write(head.data + " and " + (sum-head.data));
            return found;
        }
        head = head.next;
    }
    return found;
}

// driver code
// start with empty list
let head = null;
head = push(head, 1);
head = push(head, 4);
head = push(head, 1);
head = push(head, 12);
head = push(head, 1);
head = push(head, 18);
head = push(head, 47);
head = push(head, 16);
head = push(head, 12);
head = push(head, 14);
head = push(head, 0);

// function to print the result
let res = check_pair_sum(head, 26);
if(res == false)
    document.write("No pair found");

// this code is contributed by Kirti Agarwal

Output

14 and 12

Time complexity: O(n ^ 2)
Auxiliary Space: O(n)

Two Sum - Pair Closest to 0

Vishal_Khoda

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Linked List Pair Sum

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