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#include<unordered_map>
#include<algorithm>
#include<string>
bool comp(pair<int,int> a, pair<int,int>b)
{
    if(a.second==b.second) return a.first<b.first;
    else return a.second>b.second;
}
vector<int> Solution::solve(string A, vector<string> &B) {
 unordered_map <string,int> goodvalues;
   string s={};
    for(int i=0;i<A.size();i++)
    {
        if(A[i]=='_')
        {
            goodvalues[s]++;
            s = {};
        }
        else
        s.push_back(A[i]);
    }
    goodvalues[s]++;
    vector<int> ans;
    vector<pair<int,int> >sortvalues; 
    for(int i=0;i<B.size();i++)
    {
        s  = B[i];
        int value=0;
        string word;
        for(int j=0;j<s.size();j++)
        {
            if(s[j]=='_')
            {
                if(goodvalues[word]==1)
                {
                    value++;
                }
                word={};
            }
            else
            word.push_back(s[j]);
        }
        if(goodvalues[word]==1)
                {
                    value++;
                }
        sortvalues.push_back(make_pair(i,value));
    }
    sort(sortvalues.begin(),sortvalues.end(),comp);
 
    for(auto i:sortvalues)
    {
        ans.push_back(i.first);
    }
    return ans;
}
 

prog.cpp:4:11: error: ‘pair’ was not declared in this scope
 bool comp(pair<int,int> a, pair<int,int>b)
           ^~~~
prog.cpp:4:11: note: suggested alternative:
In file included from /usr/include/c++/6/utility:70:0,
                 from /usr/include/c++/6/unordered_map:38,
                 from prog.cpp:1:
/usr/include/c++/6/bits/stl_pair.h:190:12: note:   ‘std::pair’
     struct pair
            ^~~~
prog.cpp:4:16: error: expected primary-expression before ‘int’
 bool comp(pair<int,int> a, pair<int,int>b)
                ^~~
prog.cpp:4:20: error: expected primary-expression before ‘int’
 bool comp(pair<int,int> a, pair<int,int>b)
                    ^~~
prog.cpp:4:28: error: ‘pair’ was not declared in this scope
 bool comp(pair<int,int> a, pair<int,int>b)
                            ^~~~
prog.cpp:4:28: note: suggested alternative:
In file included from /usr/include/c++/6/utility:70:0,
                 from /usr/include/c++/6/unordered_map:38,
                 from prog.cpp:1:
/usr/include/c++/6/bits/stl_pair.h:190:12: note:   ‘std::pair’
     struct pair
            ^~~~
prog.cpp:4:33: error: expected primary-expression before ‘int’
 bool comp(pair<int,int> a, pair<int,int>b)
                                 ^~~
prog.cpp:4:37: error: expected primary-expression before ‘int’
 bool comp(pair<int,int> a, pair<int,int>b)
                                     ^~~
prog.cpp:4:42: error: expression list treated as compound expression in initializer [-fpermissive]
 bool comp(pair<int,int> a, pair<int,int>b)
                                          ^
prog.cpp:9:1: error: ‘vector’ does not name a type
 vector<int> Solution::solve(string A, vector<string> &B) {
 ^~~~~~

Standard output is empty