vector accessing non zero elements but output as zero

I' did this program what suppose save pairs of string ,int on one vector and print the strings of the maximum number on vector but when i try to find this strings don't appears nothing so I try print all values of int's on vector and although was finding the maximum of 10 all values in the vector was printing as 0. Someone can explain was it occurred and how I can access the values , please.

#include <iostream>
#include <utility>
#include <vector>
#include <string>
#include <algorithm>

using namespace std;

typedef vector<pair<string,int>> vsi;

bool paircmp(const pair<string,int>& firste,const pair<string,int>&    seconde );

int main(int argc, char const *argv[]) {
 vsi v(10);

 string s;
 int n,t;

 cin>>t;

 for (size_t i = 0;i < t;i++) {
  for (size_t j = 0; j < 10; j++) {
   cin>>s>>n;
   v.push_back(make_pair(s,n));
  }
  sort(v.begin(),v.end(),paircmp);
  int ma=v[v.size()-1].second;
  cout<<ma<<endl;
  for (size_t j = 0; j < 10; j++) {
   cout << v.at(j).second  <<endl;
   if(v[j].second == ma)

   cout<<v[j].first<<endl;

  }

 }





return 0;
}

bool paircmp(const pair<string,int>& firste,const pair<string,int>& seconde ){
 return firste.second < seconde.second;
}