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TwoSums.java

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package algorithm.leetCode;

import java.util.Arrays;

import java.util.HashMap;

import java.util.Map;

public class TwoSums {

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

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

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

int remain = target - nums[i];

if (map.containsKey(remain)) {

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

}

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

}

return new int[]{0, 0};

}

public static void main(String[] args) {

TwoSums ts = new TwoSums();

int [] k = new int[]{2, 7, 11, 15};

int[] ints = ts.twoSum(k, 9);

System.out.println(Arrays.toString(ints));

}

}