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public class Solution {
public int[] twoSum(int[] nums, int target) {
Map<Integer, Integer> valueToIndex = new HashMap<>();
for (int i = 0; i < nums.length; i++) {
int complement = target - nums[i];
Integer j = valueToIndex.get(complement);
if (j != null) {
// Found a pair that adds up to the target
return new int[] { j, i };
}


valueToIndex.put(nums[i], i);
}
throw new IllegalArgumentException(“No two sum solution”);