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#include<bits/stdc++.h>
using namespace std;
int main()
{
    int a,b,c,d,e,f,g,h,i,x,z,v,w,q=0;
    cin>>a;string ch;
    for(b=0;b<a;b++)
    {
        cin>>c>>d;
        cin>>ch;
        vector < pair < char, int > > ch3[c+1];w=1;q=0;
        for(v=0;v<c;v++)
        {
            if(v+1<=c-1 && ch[v]==ch[v+1])
                {w++;}
            else{
                ch3[q].push_back( make_pair(ch[v],w));
                                         w=1;q++;
            }
        }
        if(w>1){ch3[q].push_back( make_pair(ch[v],w));
                                         w=0;q++;}else{}
        //vector< pair<char,int> > ::iterator it;
 
        //for(it=ch3.begin();it!=ch3.end();it++)
        for(i=0;i<q;i++)
        {
            cout<<ch3[i].first<<" "<<ch3[i].second<<"\n";
        }
    }}

prog.cpp: In function ‘int main()’:
prog.cpp:28:26: error: ‘class std::vector<std::pair<char, int> >’ has no member named ‘first’
             cout<<ch3[i].first<<" "<<ch3[i].second<<"\n";
                          ^~~~~
prog.cpp:28:45: error: ‘class std::vector<std::pair<char, int> >’ has no member named ‘second’; did you mean ‘cend’?
             cout<<ch3[i].first<<" "<<ch3[i].second<<"\n";
                                             ^~~~~~

Standard output is empty