There are three changes compared with Next Greater Element I: 1, same vector; 2, circular; 3, duplicates allowed now. However, these in fact makes the solution simpler.

1, same vector: simpler, we can eliminate the hash map thanks to this

2, circular: just repeat the vector again

3, duplicates: change to store index rather than value

```
class Solution {
public:
vector<int> nextGreaterElements(vector<int>& nums) {
vector<int> res(nums.size(),-1);
stack<int> s;
for(int i=0;i<nums.size()*2;i++){
while(s.size()&&nums[s.top()]<nums[i%nums.size()]){
res[s.top()]=nums[i%nums.size()];
s.pop();
}
i<nums.size()?s.push(i):(void)0;
}
return res;
}
};
```