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Two-Sum.java

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class Solution {

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

int arr[] = new int[2];

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

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

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

}

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

int comp = target - nums[j];

if(mp.containsKey(comp)) {

int val = mp.get(comp);

if(val == j) {

continue;

}

else {

arr[0] = j;

arr[1] = val;

break;

}

}

}

return arr;

}

}