#include <fstream>
#include <queue>
#define nmax 305

using namespace std;

ifstream f("matrice2.in");
ofstream g("matrice2.out");

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

int n, Q, a[nmax][nmax], viz[nmax][nmax];
queue<pair<int,int> > q;

void citeste(){

    f >> n >> Q;
    for(int i=1; i<=n; i++){
        for(int j=1; j<=n; j++){
            f >> a[i][j];
        }
    }

}

int check(int x, int y){

    if (x <= n && y <= n && x > 0 && y > 0) return 1;
    return 0;

}

int drum(int H, int x1, int y1, int x2, int y2){//fac drumul de la x la y cu fiecare casuta avand costul >= H

    for(int i=1; i<=n; i++) for(int j=1; j<=n; j++) viz[i][j] = 0;

    if (a[x1][y1] < H) return 0;

    q.push(make_pair(x1,y1));

    for(; q.size(); ){
        int x = q.front().first;
        int y = q.front().second;
        q.pop();
        for(int k=0; k<4; k++){
            int i = x + dx[k];
            int j = y + dy[k];
            if (check(i,j) && a[i][j] >= H && viz[i][j] == 0){
                viz[i][j] = 1;
                q.push(make_pair(i,j));
            }
        }
    }

    for(; q.size(); q.pop());

    if (viz[x2][y2]) return 1;
    return 0;

}

void rezolva(){

    for(int i=1; i<=Q; i++){
        int x1, y1, x2, y2;
        f >> x1 >> y1 >> x2 >> y2;
        int st = 0;
        int dr = a[x2][y2];
        int rez = 0;
        while (st <= dr){
            int mij = (st + dr) / 2;
            if (drum(mij, x1, y1, x2, y2)){
                rez = mij;
                st = mij + 1;
            }
            else dr = mij-1;
        }
        g << rez << "\n";
    }


}

int main(){

    citeste();
    rezolva();

    f.close();
    g.close();

}