Go: package main

import (
	"fmt"
	"math"
)

type Position struct {
	X int64
	Y int64
}

func (one Position) Distance(another Position) int64 {
	return int64(math.Abs(float64(one.X-another.X)) + math.Abs(float64(one.Y-another.Y)))
}

type PersonPosition struct {
	Takayuki Position
	Kazuyuki Position
}

func (one PersonPosition) Distance() int64 {
	return one.Takayuki.Distance(one.Kazuyuki)
}

type Status struct {
	Person PersonPosition
	Turn   int64
}

type PQStatus []*Status

func solve(h, w int64) {
	var tx, ty, kx, ky int64
	fmt.Scan(&tx, &ty, &kx, &ky)
	tx--
	ty--
	kx--
	ky--
	m := make([][]int64, h)
	for i := range m {
		m[i] = make([]int64, w)
		for j := int64(0); j < w; j++ {
			fmt.Scan(&m[i][j])
		}
	}
	start := &Status{Person: PersonPosition{Takayuki: Position{X: tx, Y: ty}, Kazuyuki: Position{X: kx, Y: ky}}, Turn: 0}
	pq := make(PQStatus, 0)
	pq = append(pq, start)
	dx := []int64{0, 1, 0, -1}
	dy := []int64{1, 0, -1, 0}
	memo := make(map[PersonPosition]int64, 0)
	ans := int64(102)
	for len(pq) > 0 {
		now := &Status{}
		now = pq[0]
		pq = pq[1:]
		if ans <= now.Turn {
			continue
		}
		if _, ok := memo[now.Person]; ok {
			continue
		}
		memo[now.Person] = now.Turn

		if now.Person.Distance() == 0 && ans > now.Turn {
			ans = now.Turn
		}

		for i := 0; i < 4; i++ {
			next := &Status{}
			next = now
			next.Person.Kazuyuki.X += dx[i]
			next.Person.Kazuyuki.Y += dy[i]
			if next.Person.Kazuyuki.X < 0 || next.Person.Kazuyuki.X >= w ||
				next.Person.Kazuyuki.Y < 0 || next.Person.Kazuyuki.Y >= h ||
				m[next.Person.Kazuyuki.Y][next.Person.Kazuyuki.X] == 1 {
				next.Person.Kazuyuki.X -= dx[i]
				next.Person.Kazuyuki.Y -= dy[i]
			}
			next.Person.Takayuki.X -= dx[i]
			next.Person.Takayuki.Y -= dy[i]
			if next.Person.Takayuki.X < 0 || next.Person.Takayuki.X >= w ||
				next.Person.Takayuki.Y < 0 || next.Person.Takayuki.Y >= h ||
				m[next.Person.Takayuki.Y][next.Person.Takayuki.X] == 1 {
				next.Person.Takayuki.X += dx[i]
				next.Person.Takayuki.Y += dy[i]
			}
			next.Turn++
			if next.Turn <= 100 {
				pq = append(pq, next)
			}
		}
	}
	if ans == 102 {
		fmt.Println("NA")
	} else {
		fmt.Println(ans)
	}
}

func main() {
	var h, w int64
	for {
		fmt.Scan(&h, &w)
		if h == 0 && w == 0 {
			break
		}
		solve(h, w)
	}
}

C++: #include <cstdio>
#include <cstdlib>
#include <cmath>
#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <utility>
#include <set>
#include <map>
#include <stack>
#include <queue>
#include <functional>
#include <sstream>

using namespace std;

#define fst first
#define scd second
#define pb push_back
#define mp make_pair
#define chmin(a,b) a=min(a,b)
#define chmax(a,b) a=max(a,b)
#define rep(i,x) for(int i=0;i<(int)x;++i)
#define rep1(i,x) for(int i=1;i<=(int)x;++i)
#define rrep(i,x) for(int i=(int)x-1;i>=0;--i)
#define rrep1(i,x) for(int i=(int)x;i>=1;--i)
#define repf(i,a,x) for(int i=a;i<(int)x;++i)
#define repf1(i,a,x) for(int i=a;i<=(int)x;++i)
#define all(a) a.begin(),a.end()
#define rall(a) a.rbegin(),a.rend()

template<typename T> T get(){T a;cin >> a;return a;}
template<typename T> T rev(T & a){reverse(all(a));return a;}

typedef long long ll;
typedef vector<int> vi;
typedef pair<int, int> pii;

const int inf = 1e9;
const ll linf = 1e18;

class P {
public:
    int x, y;
    P () {
        x = y = 0;
    };
    P (int x0,int y0) {
        x=x0,y=y0;
    };
};

int dx[4] = {-1, 0, 0, 1}, dy[4] = {0, -1, 1, 0};

int d[52][52];
int memo[52][52][52][52];
bool used[52][52][52][52];

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);

    int X, Y;
    while (cin >> X >> Y, X || Y) {
        int tx, ty; cin >> tx >> ty;
        int kx, ky; cin >> kx >> ky;
        fill(d[0], d[Y+2], 1);
        rep1(i, Y) rep1(j, X) cin >> d[i][j];

        queue<pair<P, P> > q;

        q.push(mp(P(tx, ty), P(kx, ky)));
        memo[ty][tx][ky][kx] = 0;

        while (q.size()) {
            pair<P, P> r = q.front(); q.pop();
            P f = r.fst, s = r.scd;

            if (f.x == s.x && f.y == s.y) {
                cout << memo[f.y][f.x][s.y][s.x] << endl;
                goto nxt;
            }
            if (memo[f.y][f.x][s.y][s.x] >= 100) continue;
            if (used[f.y][f.x][s.y][s.x]) continue;
            used[f.y][f.x][s.y][s.x] = true;

            rep(i, 4) {
                int nfx = f.x + dx[i], nfy = f.y + dy[i];
                int nsx = s.x - dx[i], nsy = s.y - dy[i];
                if (d[nfy][nfx] == 1 && d[nsy][nsx] == 1) continue;
                if (d[nfy][nfx] == 1) nfx -= dx[i], nfy -= dy[i];
                if (d[nsy][nsx] == 1) nsx += dx[i], nsy += dy[i];
                memo[nfy][nfx][nsy][nsx] = memo[f.y][f.x][s.y][s.x] + 1;
                q.push(mp(P(nfx, nfy), P(nsx, nsy)));
            }
        }

        cout << "NA" << endl;

nxt:;
    }
}

C++: #include<iostream>
#include<queue>
#include<algorithm>
using namespace std;

typedef pair<int,int> PA;
typedef pair<PA,PA> PPA;

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

int masu[55][55][55][55];  

int main(){
  
  int w,h,tx,ty,kx,ky,ans;
  int d[55][55];

  while(cin >> w >> h,w!=0&&h!=0){
    cin >> tx >> ty >> kx >> ky;
    tx--;
    ty--;
    kx--;
    ky--;
    for(int i=0;i<h;i++){
      for(int j=0;j<w;j++){
	cin >> d[i][j];
      }
    }
    
    ans = 101;
    
    queue<PPA> que;
    
    for(int i=0;i<h;i++){
      for(int j=0;j<w;j++){
	for(int k=0;k<h;k++){
	  for(int l=0;l<w;l++) masu[i][j][k][l] = -1;
	}
      }
    }
    masu[ty][tx][ky][kx] = 0;
    que.push(PPA(PA(ty,tx),PA(ky,kx)));
    
    while(!que.empty()){
      PPA p = que.front();
      que.pop();
      
      int y1 = p.first.first;
      int x1 = p.first.second;
      int y2 = p.second.first;
      int x2 = p.second.second;
      
      for(int i=0;i<4;i++){
	int ay = y1 + dy[i];
	int ax = x1 + dx[i];
	if(d[ay][ax] == 1){
	  ay = y1;
	  ax = x1;
	}
	int by = y2 - dy[i];
	int bx = x2 - dx[i];
	if(d[by][bx] == 1){
	  by = y2;
	  bx = x2;
	}
	if(ay<0||ay>=h||ax<0||ax>=w||by<0||by>=h||bx<0||bx>=w||masu[ay][ax][by][bx]!=-1) continue;
	masu[ay][ax][by][bx] = masu[y1][x1][y2][x2]+1;
	que.push(PPA(PA(ay,ax),PA(by,bx)));
	
	if(ay==by&&ax==bx) ans = min(ans,masu[ay][ax][by][bx]);
	
      }
    }
    
    if(ans >= 100) cout << "NA" << endl;
    else cout << ans << endl;
    
  }
  return(0);
}