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class Solution {
public:
 
    class element{
 
    public:
      int value;
      int index;
      int row;
      int arrsize;
 
      element(int val,int indexnumber,int rownumber,int arraysize)
      {
         value=val;
         index=indexnumber;
         row=rownumber;
         arrsize=arraysize; 
      }
 
    };
 
   struct compare{
       bool operator()(element a,element b)
       {
         return a.value>b.value;
       }
 
   };
 
    vector<int> smallestRange(vector<vector<int>>& arr) {
 
     int mn=INT_MAX,mx=INT_MIN,range=INT_MAX;
     priority_queue<element,vector<element>,compare> q;
     int k=arr.size();
     int low,high;
     for(int i=0;i<k;++i)
         { q.push(element(arr[i][0],0,i,arr[i].size()));
           mn=min(mn,arr[i][0]);
           mx=max(mx,arr[i][0]);
         }
 
     while(!q.empty())
       {
           element temp=q.top();
           q.pop();
           int maybeminimum=temp.value;
           if(range>mx-maybeminimum)
           {
               mn=maybeminimum;
               range=mx-mn;
               low=mn;
               high=mx;
           }
 
           if(temp.index==temp.arrsize-1)
              break;
 
 
           temp.index+=1;      
           q.push(element(arr[temp.row][temp.index],temp.index,temp.row,arr[temp.row].size()));
           mx=max(mx,arr[temp.row][temp.index]);
       }
 
     vector<int> v{low,high};
     return v;
    }
};

prog.cpp:30:5: error: no template named 'vector'
    vector<int> smallestRange(vector<vector<int>>& arr) {
    ^
prog.cpp:30:31: error: no template named 'vector'
    vector<int> smallestRange(vector<vector<int>>& arr) {
                              ^
prog.cpp:30:38: error: use of undeclared identifier 'vector'
    vector<int> smallestRange(vector<vector<int>>& arr) {
                                     ^
prog.cpp:30:48: error: expected '(' for function-style cast or type construction
    vector<int> smallestRange(vector<vector<int>>& arr) {
                                            ~~~^
prog.cpp:67:1: error: expected ')'
};
^
prog.cpp:30:30: note: to match this '('
    vector<int> smallestRange(vector<vector<int>>& arr) {
                             ^
prog.cpp:66:6: error: expected ';' at end of declaration list
    }
     ^
     ;
6 errors generated.

Standard output is empty