#include<bits/stdc++.h>
#define int long long

using namespace std;

const int dx[2] = {0, 1};
const int dy[2] = {1, 0};

signed main(){
    ios::sync_with_stdio(0); cin.tie(0);
    //freopen("input.txt","r",stdin);
    //freopen("output.txt","w",stdout);

    int t;

    cin >> t;

    while (t--) {
        int n, m;

        cin >> n >> m;

        vector<vector<int>> a(n, vector<int>(m));

        for (int i = 0 ; i < n ; i++) {
            for (int j = 0 ; j < m ; j++) {
                cin >> a[i][j];
            }
        }

        int x = 0, y = 0;
        set<int> s;
        s.insert(a[0][0]);

        while (x < n-1 || y < m - 1) {
//            cout << x << " " << y << endl;
            if (x + 1 < n && y + 1 < m) {
                if (a[x+1][y] < a[x][y+1]) {
                    x += 1;
                }
                else {
                    y += 1;
                }
            }
            else {
                if (x + 1 < n) {
                    x += 1;
                }
                else {
                    y += 1;
                }
            }

            s.insert(a[x][y]);
        }

        int res = 0;

        while (s.find(res) != s.end()) {
            res += 1;
        }

        cout << res << '\n';
    }
    return 0;
}