Go: package main

import (
	"bufio"
	"fmt"
	"io"
	"os"
	"strconv"
)

const (
	initialBufSize = 100000
	maxBufSize     = 1000000
)

var sc *bufio.Scanner

func initScanner(r io.Reader) *bufio.Scanner {
	buf := make([]byte, initialBufSize)

	sc := bufio.NewScanner(r)
	sc.Buffer(buf, maxBufSize)
	sc.Split(bufio.ScanWords) // bufio.ScanLines
	return sc
}

func main() {
	sc = initScanner(os.Stdin)
	resolve()
}

func resolve() {
	results := []int{}
	for true {
		w, h := scanInt(sc), scanInt(sc)
		if w == 0 && h == 0 {
			break
		}
		grid := make([][]int, h)
		for i := 0; i < h; i++ {
			grid[i] = make([]int, w)
			for j := 0; j < w; j++ {
				grid[i][j] = scanInt(sc)
			}
		}
		num := 0
		for i := range loop0(h) {
			for j := range loop0(w) {
				start := pos{y: i, x: j}
				if grid[start.y][start.x] == 0 {
					continue
				}
				num++
				_dfs(grid, w, h, start)
			}
		}
		results = append(results, num)
	}
	for _, v := range results {
		fmt.Println(v)
	}
	return
}

func _dfs(grid [][]int, w, h int, start pos) {
	grid[start.y][start.x] = 0
	for _, df := range []pos{
		pos{1, 0}, pos{-1, 0},
		pos{0, -1}, pos{0, 1},
		pos{1, 1}, pos{-1, -1},
		pos{-1, 1}, pos{1, -1},
	} {
		np := addPos(start, df)
		if np.y < 0 || h <= np.y || np.x < 0 || w <= np.x {
			continue
		}
		if grid[np.y][np.x] == 0 {
			continue
		}
		_dfs(grid, w, h, np)
	}
}

type pos struct{ x, y int }

func addPos(p, d pos) pos {
	return pos{
		x: p.x + d.x,
		y: p.y + d.y,
	}
}

func loop0(n int) chan int {
	return loop(0, n-1, 1)
}

func loop1(n int) chan int {
	return loop(1, n, 1)
}

func loop(s, e, d int) chan int {
	ch := make(chan int)
	go func() {
		for i := s; i <= e; i += d {
			ch <- i
		}
		close(ch)
	}()
	return ch
}

// snip-scan-funcs
func scanInt(sc *bufio.Scanner) int {
	sc.Scan()
	i, _ := strconv.Atoi(sc.Text())
	return int(i)
}
func scanString(sc *bufio.Scanner) string {
	sc.Scan()
	return sc.Text()
}

C++: #include <iostream>
#include <queue>
#include <stack>
#include <vector>

using namespace std;

typedef vector<int> VI;
typedef vector< VI > VVI;
typedef vector< VVI > VVVI;


int MAP(VVI &m, int i, int j){

	int w = m[0].size();
	int h = m.size();

	if(!( 0 <= i && i <= h && 0 <= j && j <= w)){
		return 0;
	}

	if(m[i][j] == 0){
		return 0;
	}
	else if(m[i][j] == 1){
		m[i][j] = 0;
		MAP(m, i - 1, j - 1);
		MAP(m, i, j - 1);
		MAP(m, i + 1, j - 1);
		MAP(m, i - 1, j);
		MAP(m, i + 1, j);
		MAP(m, i - 1, j + 1);
		MAP(m, i, j + 1);
		MAP(m, i + 1, j + 1);
	}

	return 1;
}

int main(){
	int w, h;

	while(true){
		cin >> w >> h;

		if(w == 0 && h == 0){
			break;
		}

		VVI map(h + 1, VI(w + 1, 0));

		for(int i = 0; i < h; i++){
			for(int j = 0; j < w; j++){
				cin >> map[i][j];
			}
		}

		int count = 0;

		for(int i = 0; i < h; i++){
			for(int j = 0; j < w; j++){
				count += MAP(map, i, j);
			}
		}

		cout << count << endl;
	}
}

C++: #include <algorithm>
#include <cstdio>
#include <iostream>
#include <map>
#include <cmath>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <vector>
#include <stdlib.h>
#include <stdio.h>
#include <bitset>
#include <limits>
using namespace std;
#define FOR(I,A,B) for(int I = (A); I < (B); ++I)
#define CLR(mat) memset(mat, 0, sizeof(mat))
typedef long long ll;
int W, H;
int c[50][50];
bool visited[50][50];
int vy[8] = {-1,-1,0,1,1,1,0,-1};
int vx[8] = {0,1,1,1,0,-1,-1,-1};
void calc(int y, int x) {
  if(y < 0 || y >= H || x < 0 || x >= W) return;
  if(visited[y][x] || c[y][x] == 0) return;
  visited[y][x] = true;
  FOR(i,0,8) calc(y+vy[i],x+vx[i]);
  return;
}
int main()
{
  while(cin >> W >> H, (W || H)) {
    CLR(visited);
    FOR(y,0,H) FOR(x,0,W) cin >> c[y][x];
    int ans = 0;
    FOR(y,0,H) {
      FOR(x,0,W) {
        if(visited[y][x] || c[y][x] == 0) continue;
        calc(y, x);
        ans++;
      }
    }
    cout << ans << endl;
  }
  return 0;
}

C++: #include<iostream>
#include<string>
#include<algorithm>
#include<cstdlib>
#include<cmath>
#include<vector>
#include<list>

int history[50][50];
int w,h;
int cnt;

using namespace std;

int search_map(int x,int y,int flag_new,int m[50][50]){

  if(!(x>=0 && y<=w && y>=0 && y<=h)) return 0;

  if(history[x][y] == 1) return 0;
  else{
    history[x][y]=1;

    if(m[x][y]){

      if(flag_new) cnt++;

      for(int i=-1 ; i<2;i++){
        for(int j=-1 ; j<2;j++){
          search_map(x+i,y+j,0,m);
        }
      }

    }
    else{
      return 0;
    }

  }

}

int main(void){

  int map[50][50];

  for(cin>>w,cin>>h;w>0 && h>0;cin>>w,cin>>h){
    cnt=0;
    for(int i=0;i<50;i++){
      for(int j=0;j<50;j++){
        history[i][j]=0;
      }
    }
    //cout << w << "," << h << endl;
    for(int i=0;i<h;i++){
      for(int j=0;j<w;j++){
        cin >> map[i][j];
        //cout << map[i][j] << " ";
      }
      //cout << endl;
    }

    for(int i=0;i<h;i++){
      for(int j=0;j<w;j++){
        search_map(j,i,1,map);
        //cout << map[i][j] << " ";
      }
      //cout << endl;
    }
    cout << cnt << endl;
  }

  return 0;
}

C++: #include <cstdio>
#define f(n)for(int i=0;i<n;i++)
#define s(w)scanf("%d",&w)
int a,n,m,d[99][99];
int u[16]={-1,-1,-1,0,0,1,1,1,-1,0,1,-1,1,-1,0,1};
void k(int x,int y){
	if(d[x][y]){f(8)k(x+u[i],y+u[i+8]);d[x][y]=0;}
}
int main(){
	a=0;
	s(n);s(m);
	f(9801)d[0][i]=0;
	f(n*m)s(d[i/n+1][i%n+1]);
	f(n*m)if(d[i/n+1][i%n+1])a++,k(i/n+1,i%n+1);
	printf("%d\n",a);
	//main();
}

C++: #include <algorithm>
#include <cstdio>

using namespace std;

#define int long long
#define dotimes(i, n) for (int i = 0; i < (n); i++)

int rint() {
  int n;
  scanf("%lld", &n);
  return n;
}

int w, h;
int c[50][50], d[50][50];

bool rec(int i, int j) {
  if (!c[i][j] || d[i][j])
    return false;
  d[i][j] = true;
  for (int y = -1; y <= 1; y++)
    for (int x = -1; x <= 1; x++)
      if ((x || y) && 0 <= i+y && i+y < h && 0 <= j+x && j+x < w)
        rec(i+y, j+x);
  return true;
};

signed main() {
  for (;;) {
    w = rint();
    h = rint();
    if (!w && !h)
      return 0;
    dotimes(i, h)
      dotimes(j, w) {
        c[i][j] = rint();
        d[i][j] = 0;
      }
    int r = 0;
    dotimes(i, h)
      dotimes(j, w)
        if (rec(i, j))
          r++;
    printf("%lld\n", r);
  }
}

C++: #include <iostream>
#include <vector>

using namespace std;

inline bool inRange(int a, int x, int b) {
    return a <= x && x < b;
}

void fill(vector<vector<int> > &v, int r, int c) {
    v[r][c] = 0;
    for(int dr = -1; dr <= 1; ++dr) {
        for(int dc = -1; dc <= 1; ++dc) {
            int nr = r + dr;
            int nc = c + dc;
            if(inRange(0, nr, v.size()) && inRange(0, nc, v[0].size()) && v[nr][nc]) {
                fill(v, nr, nc);
            }
        }
    }
}

int main() {
    ios::sync_with_stdio(0);

    while(true) {
        int C, R;
        cin >> C >> R;
        if(!C && !R) break;

        vector<vector<int> > v(R, vector<int>(C));
        for(int i = 0; i < R; ++i) 
            for(int j = 0; j < C; ++j)
                cin >> v[i][j];

        int cnt = 0;
        for(int r = 0; r < R; ++r) {
            for(int c = 0; c < C; ++c) {
                if(v[r][c]) {
                    ++cnt;
                    fill(v, r, c);
                }
            }
        }

        cout << cnt << endl;
    }

    return 0;
}