next greater element

class Solution {
public:
    vector<int> nextGreaterElement(vector<int>& nums1, vector<int>& nums2) {
        map<int,int>m;
        vector<int>ans;
        bool ok = false;
        for(int i=0;i<nums2.size();i++)
        {
            ok=false;
            for(int j=i+1;j<nums2.size();j++)
            {
                if(nums2[j]>nums2[i])
                {
                    m[nums2[i]]=nums2[j];
                    ok =true ;
                    break;
                }
            }
            if(!ok)
                m[nums2[i]]=-1;
        }
        for(int i = 0; i<nums1.size();i++)
        {
            ans.push_back(m[nums1[i]]);
        }
        return ans;
    }
};