Two Sum II - Input array is sorted Java Solution - The Coding Shala

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Two Sum II - Input array is sorted

Problem:
Given an array of integers that is already sorted in ascending order, find two numbers such that they add up to a specific target number.

The function twoSum should return indices of the two numbers such that they add up to the target, where index1 must be less than index2.

Note:

Your returned answers (both index1 and index2) are not zero-based.
You may assume that each input would have exactly one solution and you may not use the same element twice.
Example:

Input: numbers = [2,7,11,15], target = 9
Output: [1,2]
Explanation: The sum of 2 and 7 is 9. Therefore index1 = 1, index2 = 2.

Two Sum II - Input array is sorted Java Solution

Approach:
We can use two pointers.

Java 

class Solution {
    public int[] twoSum(int[] numbers, int target) {
        int i = 0;
        int j = numbers.length-1;
        int[] ans = new int[2];
        while(i<j){
            if(numbers[i]+numbers[j]==target){
                ans[0] = i+1;
                ans[1] = j+1;
                return ans;
            }else if(numbers[i]+numbers[j] > target) j--;
            else i++;
        }
        return ans;
    }
}



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