#include<bits/stdc++.h>
#define taskname ""
#define el '\n'
#define fi first
#define sc second
#define pii pair<int, int>
#define all(v) v.begin(), v.end()
#define int ll
using namespace std;
using ll=long long;
using ull=unsigned long long;
using ld=long double;
#define Faster ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
using namespace std;
const int maxn=2e6+6;
const int INF=1e9;
const int mod=1e9+7;
int m,n,x[maxn],y[maxn];
void solve()
{
    cin>>n>>m;
    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=m;j++)
        {
            int xx;
            cin>>xx;
            x[xx]=i;
            y[xx]=j;
        }
    }
    int ans=0;
    for(int i=1;i<=n+m-1;i++)
    {
        bool can=1;
        for(int j=1;j<i;j++)
        {
            if((x[j]<x[i]&&y[j]>y[i])||(x[j]>x[i]&&y[j]<y[i])) can=0;
        }
        if(!can) break;
        ans=i;
    }
    cout<<ans+1<<"\n";
}
signed main()
{
    if (fopen(taskname".INP","r"))
    {
        freopen(taskname".INP","r",stdin);
        freopen(taskname".OUT","w",stdout);
    }
    Faster
    int t;
    cin>>t;
    while(t--)
    {
        solve();
    }

}