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#include<bits/stdc++.h>
using namespace std;
void sum(vector<pair<int,int>>v);
int main()
{
    int t;
    cin>>t;
    while(t--)
    {
    int n;
    cin>>n;
    vector<pair<int,int>>v;
    for(int i=0;i<n;i++)
    {
        int x,y;
        cin>>x>>y;
        v.push_back(make_pair(x,y));
    }
    sum(v);
    }
    return 0;
}
void sum(vector<pair<int,int>>v)
{
    long long sum=0;
    for(auto it=v.begin;it!=v.end;v++)
    {
        sum=sum+it->second;
    }
    cout<<sum;
    cout<<endl;
}
 

prog.cpp: In function ‘void sum(std::vector<std::pair<int, int> >)’:
prog.cpp:26:19: error: unable to deduce ‘auto’ from ‘v.std::vector<std::pair<int, int> >::begin’
     for(auto it=v.begin;it!=v.end;v++)
                   ^~~~~
prog.cpp:26:19: note:   couldn't deduce template parameter ‘auto’
prog.cpp:26:36: error: no ‘operator++(int)’ declared for postfix ‘++’ [-fpermissive]
     for(auto it=v.begin;it!=v.end;v++)
                                   ~^~

Standard output is empty