问为什么这个c++代码在Dev c++上运行，而不是在网站上运行？

EN

vector<int> findDisappearedNumbers(vector<int>& nums) 
{   
  vector<int> temp;
  const int len = nums.size();
  int j=0;
  //sorted the array
  sort(nums.begin(), nums.end());
  //Added non-repetitive numbers into a temp vector
  for(int i=0;i<len;i++)
  {
    if(nums[i]!=nums[i+1])
    {
      temp[j++]=nums[i];
    }
  }
  //cleared nums vector for later use
  nums.erase(nums.begin(), nums.end());
  //added missing numbers in the sequence to both temp and nums vectors
  for(int i=0;i<len;i++)
  {
    if(temp[i]!=i+1)
    {
      temp.insert(temp.begin()+i, i+1);
      nums.insert(nums.end(),i+1);
    }
  } 
  return nums;
}