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#include <bits/stdc++.h>
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using namespace std;
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#define ll long long
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#define int ll
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const int MaxN = 1e6 + 100;
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const int INF = 1e9;
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int T=1, N, M;
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template<class T>
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inline void qread(T &sum)
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{
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  sum=0;int boo=1;
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  char x=getchar();
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  while(x<'0'||x>'9'){if(x=='-')boo=-1;x=getchar();}
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  while(x>='0'&&x<='9'){sum=(sum<<1)+(sum<<3)+x-'0';x=getchar();}
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  sum*=boo;
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}
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template<class T>
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void qput(T x)
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{
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  if(x<0){
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    x=-x;
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    putchar('-');}
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  if(x>9)
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    qput(x/10);
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  putchar(x%10+48);
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}
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inline void Solve()
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{
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  int n;
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  cin>>n;
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  int maxn=-1,ans=0;\\记得初始化
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  for(int i=0;i<n;i++){
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    int a,b;
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    cin>>a>>b;
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    if(a>10){
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      continue;
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    }
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    if(b>maxn){
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      maxn=b;
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      ans=i+1;\\因为我的习惯是从零开始，这里的ans更新时需要+1.
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    }
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  }
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  cout<<ans<<endl;
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}
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signed main()
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{
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  //freopen(".in", "r", stdin);
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  //freopen(".out", "w", stdout);
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  ios::sync_with_stdio(0);
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  //cin.tie(0);
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  cin >> T;
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  while (T--)
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    Solve();
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  //fclose(stdin);
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  //fclose(stdout);
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  return 0;
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}