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public class Solution {

// example in leetcode book

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

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

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

int x = nums[i];

if (map.containsKey(target - x)) {

return new int[]{map.get(target - x), i};

}

map.put(x, i);

}

throw new IllegalArgumentException("No two sum solution");

}

}