Skip to main content

TWO SUM -LEET CODE PROBLEM 1

  https://leetcode.com/problems/two-sum/

Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target.

You may assume that each input would have exactly one solution, and you may not use the same element twice.

You can return the answer in any order.

 

Example 1:

Input: nums = [2,7,11,15], target = 9
Output: [0,1]
Output: Because nums[0] + nums[1] == 9, we return [0, 1].

Example 2:

Input: nums = [3,2,4], target = 6
Output: [1,2]

Example 3:

Input: nums = [3,3], target = 6
Output: [0,1]

class Solution {

    public int[] twoSum(int[] nums, int target) {

    

        HashMap<Integer,Integer> map=new HashMap<Integer,Integer>();

        

        for(int i=0;i<nums.length;i++){

            

            if(map.get(nums[i])==null){

                map.put(target-nums[i],i);

            }

            else{

                return new int[]{map.get(nums[i]),i};

            }

        }

        return null;

    }

}


Comments

.

Popular posts from this blog

Tree Traversal in JAVA (InOder/preOrder/postOrder)

Tree Traversal in JAVA (InOder/preOrder/postOrder):- Tree traversal can be done through three ways. 1)Inorder:- Go recursively to the left node. Read a node Go recursively to the right node. 2)Pre Order. Read a node Go recursively to the left node. Go recursively to the right node. 2)Post Order. Go recursively to the left node. Go recursively to the right node. Read a node public void inorder ( Node root ) { if ( root == null ) { return ; } inorder ( root . left ); System . out . print ( root . data + "," ); inorder ( root . right ); } public void preOrder ( Node root ) { if ( root == null ) { return ; } System . out . print ( root . data + "," ); preOrder ( root . left ); preOrder ( root . right ); } public void postOrder ( Node root ) { if ( root == null ) { return ; } postOrder ( root . left ); postOrder ( root . right ); Sy

How to build a project in eclipse with MAVEN build tool?

How to build a project in eclipse with MAVEN build tool? Step 1:- Install maven and set the path in my computer. Once path is set for java and maven you will get a screen With version installed in your system. Step 2:- Write a command mvn archetype:generate to build a project of your choice.This will give you a option to select a project from list. Step 3:- As soon as this operation will complete maven give you choice to choose project.Search for maven-archetype-webapp this will build a web project with basic structure. Step4:- Follow the below procedure to give name , version ,package ,artifact and group id of your choice. Step 5:- You will get screen with build success.Congrats your project is build in directory. Step 6: Go in the directory to check for the folders automatically created by maven. You will get pom file and src folder and the package folder. Step:-7  Move to the directry having pom.xml and run mvn ecl