Given an integer array arr[] of size N, the task is to find contiguous pair {a, b} such that sum of both elements in the pair is maximum. If there are more than one such pairs with maximum sum then print any of such pair. In the case of multiple pairs with the largest sum, print any one of them.
Examples:
Input: arr[] = {1, 2, 3, 4}
Output: 3 4
Explanation:
Here, the contiguous pairs in the array are:
{1, 2} -> Sum 3
{2, 3} -> Sum 5
{3, 4} -> Sum 7
Maximum sum is 7 for the pair is (3, 4) so this is answer.
Input: arr[] = {11, -5, 9, -3, 2}
Output: 11 -5
The contiguous pairs with their respective sums are :
{11, -5} -> Sum 6
{-5, 9} -> Sum 4
{9, -3} -> Sum 6
{-3, 2} -> Sum -1
The maximum sum obtained is 6 from the pairs (11, -5) and (9, -3).
Approach:
Follow the steps below to solve the problem:
- Generate all the continuous pairs one by one and calculate their sum.
- Compare the sum of every pair with the maximum sum and update the pair corresponding to the maximum sum accordingly.
- Return the pair representing the maximum sum.
Below is the implementation of the above approach :
C++
// C++ program to find the// a contiguous pair from the// which has the largest sum#include <bits/stdc++.h>using namespace std;// Function to find and return// the largest sum contiguous pairvector<int> largestSumpair(int arr[], int n){ // Stores the contiguous pair vector<int> pair; // Initialize maximum sum int max_sum = INT_MIN, i; for (i = 1; i < n; i++) { // Compare sum of pair with max_sum if (max_sum < (arr[i] + arr[i - 1])) { max_sum = arr[i] + arr[i - 1]; if (pair.empty()) { // Insert the pair pair.push_back(arr[i - 1]); pair.push_back(arr[i]); } else { pair[0] = arr[i - 1]; pair[1] = arr[i]; } } } return pair;}// Driver Codeint main(){ int arr[] = { 11, -5, 9, -3, 2 }; int N = sizeof(arr) / sizeof(arr[0]); vector<int> pair = largestSumpair(arr, N); for (auto it = pair.begin(); it != pair.end(); ++it) { cout << *it << ' '; } return 0;}// This code is contributed by shubhamsingh10 |
Java
// Java program to find the// a contiguous pair from the// which has the largest sumimport java.util.*;class GFG { // Function to find and return // the largest sum contiguous pair public static Vector<Integer> largestSumpair(int[] arr, int n) { // Stores the contiguous pair Vector<Integer> pair = new Vector<Integer>(); // Initialize maximum sum int max_sum = Integer.MIN_VALUE, i; for (i = 1; i < n; i++) { // Compare sum of pair with max_sum if (max_sum < (arr[i] + arr[i - 1])) { max_sum = arr[i] + arr[i - 1]; if (pair.isEmpty()) { // Insert the pair pair.add(arr[i - 1]); pair.add(arr[i]); } else { pair.set(0, arr[i - 1]); pair.set(1, arr[i]); } } } return pair; } // Driver Code public static void main(String[] args) { int arr[] = { 11, -5, 9, -3, 2 }; int N = arr.length; Vector<Integer> pair = new Vector<Integer>(); pair = largestSumpair(arr, N); for (Integer it : pair) { System.out.print(it + " "); } }}// This code is contributed by divyeshrabadiya07 |
Python3
# Python3 program to find the# a contiguous pair from the# which has the largest sum# importing sysimport sys# Function to find and return# the largest sum contiguous pairdef largestSumpair(arr, n): # Stores the contiguous pair pair = []# Initialize maximum sum max_sum = -sys.maxsize-1 for i in range(1, n): # Compare sum of pair with max_sum if max_sum < (arr[i] + arr[i-1]): max_sum = arr[i] + arr[i-1] if pair == []: # Insert the pair pair.append(arr[i-1]) pair.append(arr[i]) else: pair[0] = arr[i-1] pair[1] = arr[i] return pair# Driver Codearr = [11, -5, 9, -3, 2]N = len(arr)pair = largestSumpair(arr, N)print(pair[0], end=" ")print(pair[1], end=" ") |
C#
// C# program to find the// a contiguous pair from the// which has the largest sumusing System;using System.Collections;using System.Collections.Generic;class GFG { // Function to find and return // the largest sum contiguous pair public static ArrayList largestSumpair(int[] arr, int n) { // Stores the contiguous pair ArrayList pair = new ArrayList(); // Initialize maximum sum int max_sum = int.MinValue, i; for (i = 1; i < n; i++) { // Compare sum of pair with max_sum if (max_sum < (arr[i] + arr[i - 1])) { max_sum = arr[i] + arr[i - 1]; if (pair.Count == 0) { // Insert the pair pair.Add(arr[i - 1]); pair.Add(arr[i]); } else { pair[0] = arr[i - 1]; pair[1] = arr[i]; } } } return pair; } // Driver code public static void Main(string[] args) { int[] arr = { 11, -5, 9, -3, 2 }; int N = arr.Length; ArrayList pair = new ArrayList(); pair = largestSumpair(arr, N); foreach(int it in pair) { Console.Write(it + " "); } }}// This code is contributed by rutvik_56 |
Javascript
<script>// Javascript program to find the// a contiguous pair from the// which has the largest sum// Function to find and return// the largest sum contiguous pairfunction largestSumpair(arr, n){ // Stores the contiguous pair var pair = []; // Initialize maximum sum var max_sum = Number.MIN_VALUE, i; for (i = 1; i < n; i++) { // Compare sum of pair with max_sum if (max_sum < (arr[i] + arr[i - 1])) { max_sum = arr[i] + arr[i - 1]; if (pair.length != 0) { // Insert the pair pair[0] = arr[i - 1]; pair[1]= arr[i]; } else { pair[0] = arr[i - 1]; pair[1] = arr[i]; } } } return pair;}// Driver Codevar arr = [ 11, -5, 9, -3, 2 ];var N = arr.length;pair = largestSumpair(arr, N);for (var it of pair) { document.write(it + " ");}// This code is contributed by shubhamsingh10</script> |
Output:
11 -5
Time Complexity: O(N)
Auxiliary Space: O(1)
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