- Trending Categories
Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Write a Golang program to find pairs with the given sum in an array(O(n))
Examples
Input Array = [1, 3, 5, 7, 8, 9], sum = 11 => (3, 8)
Approach to solve this problem
Step 1: Define a method that accepts an array and sum.
Step 2: Define a mapping variable, type map[int]int.
Step 3: Iterate the given array as i.
Step 4: If key in mapping sum-arr[i] is not present, then mapping[arr[i]]=i.
Step 5: If present, then print “pair is found”.
Step 6: At the end, print that “pair not found”.
Program
package main import "fmt" func findSumPair(arr []int, sum int){ mapping := make(map[int]int) for i:=0; i<len(arr); i++{ if mapping[sum-arr[i]] == 0{ mapping[arr[i]] = i } else { fmt.Printf("Pair for given sum is (%d, %d).\n", arr[mapping[sum-arr[i]]], arr[i]) return } } fmt.Println("Pair not found in given array.") } func main(){ findSumPair([]int{4, 3, 6, 7, 8, 1, 9}, 15) findSumPair([]int{4, 3, 6, 7, 8, 1, 9}, 100) }
Output
Pair for given sum is (7, 8). Pair not found in given array.
Advertisements