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package leetcode;

import java.util.HashMap;

import java.util.Map;

public class SingleNumber {

public static void main(String[] args){

SingleNumber test = new SingleNumber();

System.out.println(test.singleNumber(new int[]{2,1,2,1,5,6,6}));

}

public int singleNumber(int[] nums) {

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

for(int i: nums){

if(map.containsKey(i))

map.put(i, map.get(i)+1);

else

map.put(i, 1);

}

for(Map.Entry e: map.entrySet()){

if((int)e.getValue()==1)

return (int)e.getKey();

}

return 0;

}

}