Go: package main

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

func getScanner(fp *os.File) *bufio.Scanner {
	scanner := bufio.NewScanner(fp)
	scanner.Split(bufio.ScanWords)
	scanner.Buffer(make([]byte, 1000005), 1000005)
	return scanner
}

func getNextString(scanner *bufio.Scanner) string {
	scanner.Scan()
	return scanner.Text()
}

func getNextInt(scanner *bufio.Scanner) int {
	i, _ := strconv.Atoi(getNextString(scanner))
	return i
}

func getNextInt64(scanner *bufio.Scanner) int64 {
	i, _ := strconv.ParseInt(getNextString(scanner), 10, 64)
	return i
}

func getNextUint64(scanner *bufio.Scanner) uint64 {
	i, _ := strconv.ParseUint(getNextString(scanner), 10, 64)
	return i
}

func getNextFloat64(scanner *bufio.Scanner) float64 {
	i, _ := strconv.ParseFloat(getNextString(scanner), 64)
	return i
}

func main() {
	fp := os.Stdin
	wfp := os.Stdout
	cnt := 0

	if os.Getenv("MASPY") == "ますピ" {
		fp, _ = os.Open(os.Getenv("BEET_THE_HARMONY_OF_PERFECT"))
		cnt = 0
	}
	if os.Getenv("MASPYPY") == "ますピッピ" {
		wfp, _ = os.Create(os.Getenv("NGTKANA_IS_GENIUS10"))
	}

	scanner := getScanner(fp)
	writer := bufio.NewWriter(wfp)
	for solve(scanner, writer) {

	}
	for i := 0; i < cnt; i++ {
		fmt.Fprintln(writer, "-----------------------------------")
		solve(scanner, writer)
	}
	writer.Flush()
}

func solve(scanner *bufio.Scanner, writer *bufio.Writer) bool {
	sol := solver{}
	sol.w = getNextInt(scanner)
	sol.h = getNextInt(scanner)
	if sol.w == 0 && sol.h == 0 {
		return false
	}
	sol.land = makeInts(sol.h, sol.w)
	for y := 0; y < sol.h; y++ {
		for x := 0; x < sol.w; x++ {
			sol.land[y][x] = getNextInt(scanner)
		}
	}
	ans := 0
	for y := 0; y < sol.h; y++ {
		for x := 0; x < sol.w; x++ {
			if sol.land[y][x] == 0 {
				continue
			}
			ans++
			sol.dfs(y, x)
		}
	}
	fmt.Fprintln(writer, ans)
	return true
}

type solver struct {
	w, h int
	land [][]int
}

func (sol *solver) dfs(y, x int) {
	if y < 0 {
		return
	}
	if y >= sol.h {
		return
	}
	if x < 0 {
		return
	}
	if x >= sol.w {
		return
	}
	if sol.land[y][x] == 0 {
		return
	}
	sol.land[y][x] = 0
	dy := [8]int{-1, -1, -1, 0, 0, 1, 1, 1}
	dx := [8]int{-1, 0, 1, -1, 1, -1, 0, 1}
	for i := 0; i < 8; i++ {
		sol.dfs(y+dy[i], x+dx[i])
	}
}
func makeInts(h, w int) [][]int {
	index := make([][]int, h, h)
	data := make([]int, h*w, h*w)
	for i := 0; i < h; i++ {
		index[i] = data[i*w : (i+1)*w]
	}
	return index
}

C++: #include <bits/stdc++.h>
using namespace std;

int main() {
    int n, m;
    int dx[] = {1, 0, -1, 0, 1, 1, -1, -1};
    int dy[] = {0, 1, 0, -1, 1, -1, 1, -1};
    while (cin >> m >> n, n || m) {
        vector<vector<int>> v(n, vector<int>(m));
        for (auto& i : v) for (auto& j : i) cin >> j;

        int count = 0;
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < m; j++) {
                if (v[i][j] == 0) continue;
                count++;
                queue<pair<int,int>> que;
                que.push(make_pair(i, j));

                while (que.size()) {
                    auto p = que.front();
                    que.pop();
                    int x = p.first;
                    int y = p.second;

                    if (v[x][y] == 0) continue;

                    v[x][y] = 0;

                    for (int k = 0; k < 8; k++) {
                        int nx = x + dx[k];
                        int ny = y + dy[k];

                        if (0 <= nx && nx < n && 0 <= ny && ny < m && v[nx][ny] == 1) {
                            que.push(make_pair(nx, ny));
                        }
                    }
                }
            }
        }

        cout << count << endl;
    }

    return 0;
}

C++: #include <iostream>
#include <string>
#include <algorithm>
#include <functional>
#include <vector>
#include <utility>
#include <cstring>
#include <iomanip>
#include <numeric>
#include <limits>
#include <cmath>
#include <cassert>
#include <queue>

using namespace std;
using ll = long long;

const int INF = 1<<30;
const int MOD = (int)1e9 + 7;
const int MAX_N = (int)1e5 + 5;
const int dy[] = {1, 0, -1, 0, 1, 1, -1, -1};
const int dx[] = {0, 1, 0, -1, 1, -1, 1, -1};
#define debug(x) cout << #x << ": " << x << endl

int W, H;

void bfs(int y, int x, const vector<vector<int>> &table, vector<vector<int>> &flag)
{
    using P = pair<int, int>;
    queue<P> que;
    que.push(P(y, x));
    flag[y][x] = 0;
    while(que.size())
    {
        P p = que.front(); que.pop();
        for(int i = 0; i < 8; i++)
        {
            int ny = p.first + dy[i];
            int nx = p.second + dx[i];
            if(ny < 0 or nx < 0 or ny >= H or nx >= W) continue;
            if(table[ny][nx] == 0 or not flag[ny][nx]) continue;
            flag[ny][nx] = 0;
            que.push(P(ny, nx));
        }
    }
}

signed main(void)
{
    cin.tie(0);
    ios::sync_with_stdio(false);
    while(cin >> W >> H, W or H)
    {
        vector<vector<int>> table(H, vector<int>(W));
        for(int i = 0; i < H; i++)
        {
            for(int j = 0; j < W; j++) cin >> table[i][j];
        }
        vector<vector<int>> flag = table;
        int ans = 0;
        for(int i = 0; i < H; i++)
        {
            for(int j = 0; j < W; j++)
            {
                if(not flag[i][j]) continue;
                ans++;
                bfs(i, j, table, flag);
            }
        }
        cout << ans << endl;
    }
    return 0;
}

C++: #include <iostream>
#include <cstdio>
using namespace std;
char field[51][51];
int W, H;

void dfs(int x, int y) {
  //cout << "field[x][y] = " << field[x][y] << endl;
  field[x][y] = '0';
  
  for(int dx = -1 ; dx <= 1 ; dx++) {
    for(int dy = -1 ; dy <= 1 ; dy++) {
      int nx = x + dx, ny = y + dy;
      if(0 <= nx && nx < H && 0 <= ny && ny < W && field[nx][ny] == '1') dfs(nx, ny);
    }
  }
}

int main(void) {
  while(cin >> W >> H, W != 0 && H != 0) {
    int res = 0;
    for(int i = 0 ; i < H ; i++)
      for(int j = 0 ; j < W ; j++) cin >> field[i][j];
    
    for(int i = 0 ; i < W ; i++) {
      for(int j = 0 ; j < H ; j++) {
	if(field[i][j] == '1') {
	  dfs(i, j);
	  res++;
	  /*cout << endl;
	  for(int b = 0 ; b < H ; b++) {
	    for(int a = 0 ; a < W ; a++) {
	      cout << field[b][a] << ' ';
	    }
	    cout << endl;
	  }
	  cout << endl;*/
	}
      }
    }
    cout << res << endl;
  }
  return 0;
}

C++: #include "bits/stdc++.h"

using namespace std;

typedef pair<int, int> P;

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

    int w,h;
    int dx[8]={1,1,1,0,-1,-1,-1,0},dy[8]={-1,0,1,1,1,0,-1,-1};
    while(cin>>w>>h,w||h){
        vector< vector<int> > field(h,vector<int>(w));
        for(int i=0;i<h;i++){
            for(int j=0;j<w;j++){
                cin>>field[i][j];
            }
        }
        int res=0;
        for(int i=0;i<h;i++){
            for(int j=0;j<w;j++){
                if(field[i][j]){
                    //cout<<i<<" "<<j<<endl;
                    queue<P> q;
                    field[i][j]=0;
                    q.push(P(i,j));
                    while(!q.empty()){
                        P p=q.front();q.pop();
                        for(int k=0;k<8;k++){
                            int nx=p.first+dx[k],ny=p.second+dy[k];
                            if(nx<0||h<=nx||ny<0||w<=ny) continue;
                            if(field[nx][ny]==0) continue;
                            field[nx][ny]=0;
                            q.push(P(nx,ny));
                        }
                    }
                    res++;
                }
            }
        }
        cout<<res<<endl;
    }
}