class Solution {
public int singleNumber(int[] nums) {
HashMap<Integer,Integer> map = new HashMap<>();
for(int i = 0 ; i < nums.length ; ++i){
if(map.containsKey(nums[i])){
map.put(nums[i], map.get(nums[i]) +1);
} else {
map.put(nums[i],1);
}
}
for(Map.Entry<Integer,Integer> map2 : map.entrySet()){
if(map2.getValue() == 1){
return map2.getKey();
}
}
throw new IllegalArgumentException();
}
}
class Solution {
public int singleNumber(int[] nums) {
int x = 0;
for(int i: nums){
x ^= i;
}
return x;
}
}
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