Two Sum

Overview

Easy 1 solution

Categories

ArrayHash Table

package array.iterative;

import java.util.HashMap;
import java.util.Map;

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

        Map<Integer, Integer> map = new HashMap<>();
        for (int i = 0; i < nums.length; i++) {
            int complement = target - nums[i];
            if (map.containsKey(complement))
                return new int[] { map.get(complement), i };
            map.put(nums[i], i);
        }

        return new int[] { -1, -1 };
    }
}