#include <stdio.h>
#include <algorithm>
#include <vector>
#define NMAX 305
#define LMAX 20005
#define HMAX 300505
#define KMAX 1000005
#define pb push_back
using namespace std;
int n,q,A[NMAX][NMAX],r,root[HMAX];
struct query{int x1,y1,x2,y2;};
query B[LMAX];
struct pereche{int a,b;};
pereche C[HMAX];
vector <int> D[KMAX];
inline int code(int x,int y)
{
	return (x<<9)+y;
}
int dlin[]={0,0,-1,1};
int dcol[]={-1,1,0,0};
void read()
{
	scanf("%d%d",&n,&q);
	int i,j;
	for (i=1; i<=n; i++)
		for (j=1; j<=n; j++)
		{
			scanf("%d",&A[i][j]);
			D[A[i][j]].pb(code(i,j));
		}
	for (i=1; i<=q; i++)
		scanf("%d%d%d%d",&B[i].x1,&B[i].y1,&B[i].x2,&B[i].y2);
	for (i=1; i<=q; i++)
		C[i].b=i;
}
bool comp(pereche x,pereche y)
{
	return x.a>y.a;
}
bool comp2(pereche x,pereche y)
{
	return x.b<y.b;
}
void reset_values()
{
	int i;
	for (i=1; i<HMAX; i++)
		root[i]=i;
}
int find_root(int nod)
{
	int nod2=nod,act;
	while (root[nod2]!=nod2)
		nod2=root[nod2];
	while (root[nod]!=nod)
	{
		act=root[nod];
		root[nod]=nod2;
		nod=act;
	}
	return nod2;
}
void uneste(int nod1,int nod2)
{
	root[nod1]=nod2;
}
void solve()
{
	int i,j,k,t,step,lin,col,act,lin2,col2,ind,which;
	for (step=1; step<=KMAX; step<<=1);
	for (  ; step; step>>=1)
	{
		reset_values();
		ind=0;
		for (j=1; j<=q; j++)
		{
			C[j].a+=step;
			if (C[j].a>=KMAX)
				C[j].a-=step;;
		}
		sort(C+1,C+q+1,comp);
		for (j=KMAX-1; j>=1; j--)
		{
			for (k=0; k<D[j].size(); k++)
			{
				act=D[j][k];
				lin=act>>9; col=act-(lin<<9);
				for (t=0; t<4; t++)
				{
					lin2=lin+dlin[t]; col2=col+dcol[t];
					if (A[lin2][col2]>=j)
						uneste(find_root(code(lin,col)),find_root(code(lin2,col2)));
				}
			}
			while (ind+1<=q && C[ind+1].a==j)
			{
				ind++;
				which=C[ind].b;
				if (find_root(code(B[which].x1,B[which].y1))!=find_root(code(B[which].x2,B[which].y2)))
					C[ind].a-=step;
			}
		}
	}
	sort(C+1,C+q+1,comp2);
	for (i=1; i<=q; i++)
		printf("%d\n",C[i].a);
}
int main()
{
	freopen("matrice2.in","r",stdin);
	freopen("matrice2.out","w",stdout);
	read();
	solve();
	return 0;
}