Go: package main

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

var (
	readString func() string
	readBytes  func() []byte
	stdout     *bufio.Writer
)

func init() {
	readString, readBytes = newReadString(os.Stdin)
	stdout = bufio.NewWriter(os.Stdout)
}

func newReadString(ior io.Reader) (func() string, func() []byte) {
	r := bufio.NewScanner(ior)
	r.Buffer(make([]byte, 1024), math.MaxInt32)
	r.Split(bufio.ScanWords)

	f1 := func() string {
		if !r.Scan() {
			panic("Scan failed")
		}
		return r.Text()
	}
	f2 := func() []byte {
		return []byte(f1())
	}
	return f1, f2
}

func readInt() int {
	return int(readInt64())
}

func readInt64() int64 {
	i, err := strconv.ParseInt(readString(), 10, 64)
	if err != nil {
		panic(err.Error())
	}
	return i
}

func readFloat64() float64 {
	f, err := strconv.ParseFloat(readString(), 64)
	if err != nil {
		panic(err.Error())
	}
	return f
}

func printf(f string, args ...interface{}) (int, error) {
	return fmt.Fprintf(stdout, f, args...)
}

func println(args ...interface{}) (int, error) {
	return fmt.Fprintln(stdout, args...)
}

func eprintln(args ...interface{}) (int, error) {
	return fmt.Fprintln(os.Stderr, args...)
}

func eprintf(f string, args ...interface{}) (int, error) {
	return fmt.Fprintf(os.Stderr, f, args...)
}

func min(a, b int) int {
	if a < b {
		return a
	}
	return b
}

func min64(a, b int64) int64 {
	if a < b {
		return a
	}
	return b
}

func max(a, b int) int {
	if a < b {
		return b
	}
	return a
}

func max64(a, b int64) int64 {
	if a < b {
		return b
	}
	return a
}

func abs(a int) int {
	if a < 0 {
		return -a
	}
	return a
}

func abs64(a int64) int64 {
	if a < 0 {
		return -a
	}
	return a
}

func gcd(a, b int) int {
	if b == 0 {
		return a
	}
	return gcd(b, a%b)
}

func gcd64(a, b int64) int64 {
	if b == 0 {
		return a
	}
	return gcd64(b, a%b)
}

// readString() string
// readInt() int
// readInt64() int64
// readFloat64() float64

// -----------------------------------------------------------------------------

func main() {
	defer stdout.Flush()

	for {
		ans, ok := solve()
		if !ok {
			break
		}
		println(ans)
	}

}

func solve() (int, bool) {
	w := readInt()
	h := readInt()
	if w == 0 && h == 0 {
		return 0, false
	}

	c := make([][]int, h+2)
	c[0] = make([]int, w+2)
	c[h+1] = make([]int, w+2)
	for i := 1; i-1 < h; i++ {
		c[i] = make([]int, w+2)
		for j := 1; j-1 < w; j++ {
			c[i][j] = readInt()
		}
	}

	var ans int
	for i := 1; i-1 < h; i++ {
		for j := 1; j-1 < w; j++ {
			if 0 < c[i][j] {
				ans++
				dfs(c, i, j)
			}
		}
	}
	return ans, true
}

func dfs(c [][]int, y, x int) {
	c[y][x] = 0
	dx := []int{-1, 0, 1, -1, 1, -1, 0, 1}
	dy := []int{-1, -1, -1, 0, 0, 1, 1, 1}
	for i := range dx {
		nx := x + dx[i]
		ny := y + dy[i]
		if 0 < c[ny][nx] {
			dfs(c, ny, nx)
		}
	}
}

// -----------------------------------------------------------------------------

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

int c[100][100],ans;

int search(int x, int y){
	if(c[x][y] == 1){
		c[x][y] = 2;
		search(x-1, y-1);
		search(x-1, y);
		search(x-1, y+1);
		search(x, y-1);
		search(x, y+1);
		search(x+1, y-1);
		search(x+1, y);
		search(x+1, y+1);
	return 1;	
	}
	else return 0;
}

int main(){
	int w,h,i,j;
	while(cin >> w >> h && w > 0 && h >0){
		for(i = 1; i <= 99; i++){
			for(j = 1; j <= 99; j++){
				c[i][j] = 0;
			}
		}
		ans = 0;
		for(i = 1; i <= h; i++){
			for(j = 1; j <= w; j++){
				cin >> c[i][j];
			}
		}
		for(i = 1; i <= h; i++){
			for(j = 1; j <= w; j++){
				if(search(i, j) == 1){
					ans++;
				}
			}
		}
		cout << ans << endl;
	}
}

C++: #include <bits/stdc++.h>
#define REP(i,n) for(int i = 0 ; i < n ; ++i)

using namespace std;

#ifdef _DEBUG
#define debug_io fstream cin("input.txt");ofstream cout("output.txt");
#else
#define debug_io ;
#endif

int main()
{
	debug_io
	int w, h;
	while (cin >> w >> h, w + h) {
		int tile[55][55];
		REP(i, h) {
			REP(j, w) {
				cin >> tile[i][j];
			}
		}

		int dx[8] = { 0,0,1,-1,1,1,-1,-1 };
		int dy[8] = { 1,-1,0,0,1,-1,1,-1 };

		int ans = 0;
		REP(i, h) {
			REP(j, w) {
				if (tile[i][j] == 1) {
					vector<pair<int, int>> bfs;
					bfs.push_back({ i,j });

					while (bfs.size()) {
						auto now = bfs.front();
						bfs.erase(bfs.begin());
						int x = now.second;
						int y = now.first;
						if (tile[y][x] == 2) {
							continue;
						}
						tile[y][x] = 2;
						REP(k, 8) {
							int nx = max(0,min(x + dx[k],w-1));
							int ny = max(0, min(y + dy[k], h - 1));
							if (tile[ny][nx] == 1) {
								bfs.push_back({ ny,nx });
							}
						}
					}
					ans++;
					
				}
			}
		}
		cout << ans << endl;
	}
}

C++: #include <bits/stdc++.h>
#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define REP(i,n) for(int i=0;i < (n);i++)
#define ALL(obj) (obj).begin(),(obj).end()
#define SCANF(i) int i;scanf("%d",&i)
using namespace std;
using P = pair<int,int>;
const long long INF = 1LL << 60;
const int IINF=100000000;
const int MOD = (int)1e9 + 7;
typedef long long ll;
//約数列挙
vector<long long> divisor(long long n) {
    vector<long long> ret;
    for (long long i = 1; i * i <= n; i++) {
        if (n % i == 0) {
            ret.push_back(i);
            if (i * i != n) ret.push_back(n / i);
        }
    }
    //sort(ret.begin(), ret.end()); // 昇順に並べる
    return ret;
}
vector<int> dx={1,0,-1,0};vector<int> dy={0,-1,0,1};
int h,w;
vector<vector<int>> grid;
vector<vector<bool>> seen;
int xx[8] = {0,-1,-1,-1,0,1,1,1};
int yy[8] = {1,1,0,-1,-1,-1,0,1};
void dfs(int x,int y){
    seen[x][y] = true;
    for(int i=0;i<8;i++){
        int nx = x+xx[i];int ny = y+yy[i];
        if(nx<0||nx>h-1||ny<0||ny>w-1)continue;
        if(!seen[nx][ny] && grid[nx][ny]==1){
            dfs(nx,ny);
        }
    }
}
signed main () {
    while(cin >> w >> h){
        if(h+w==0)break;
        int cnt = 0;
        grid.assign(h,vector<int>(w));
        seen.assign(h,vector<bool>(w,false));
        REP(i,h)REP(j,w)cin >> grid[i][j];
        REP(i,h)REP(j,w){
            if(grid[i][j]==1 && !seen[i][j]){
                dfs(i,j);
                cnt++;
            }
        }
        cout << cnt << endl;
    }
}

C++: // Time-stamp: <2012-06-26 20:15:18 naga>

#include<iostream>
#include<cstdio>
using namespace std;
int maps[52][52];
int w,h;
void init(){
  for(int i = 0; i < 52; i++){
    for(int j = 0; j < 52; j++){
      maps[i][j] = 0;
    }
  }
  return;
}

void search(int x, int y){
  maps[y][x] = 0;
  if(maps[y - 1][x] && y > 0){
    search(x, y -1);
  }
  if(maps[y - 1][x - 1] && x > 0 && y > 0){
    search(x - 1, y - 1);
  }
  if(maps[y][x - 1] && x > 0){
    search(x - 1, y);
  }
  if(maps[y + 1][x - 1] && y < h && x > 0){
    search(x - 1, y + 1);
  }
  if(maps[y + 1][x] && y < h){
    search(x, y + 1);
  }
  if(maps[y + 1][x + 1] && y < h && x < w){
    search(x + 1, y + 1);
  }
  if(maps[y][x + 1] && x < w){
    search(x + 1, y);
  }
  if(maps[y - 1][x + 1] && y > 0 && x < w){
    search(x + 1, y - 1);
  }
  return;
}


int main(){
  int count;
  while(true){
    cin >> w >> h;
    if( !w && !h){
      break;
    }
    count = 0;
    init();
    for(int i = 0; i < h; i++){
      for(int j = 0; j < w; j++){
	cin >> maps[i][j];
      }
    }
    
    for(int i = 0; i < h; i++){
      for(int j = 0; j < w; j++){
	if(maps[i][j]){
	  count++;
	  search(j,i);
	}
      }
    }

    printf("%d\n", count);
  }
  return 0;
}