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 <iostream>
#include <vector>
#include <string>
#include <queue>
#include <climits>
#include <utility>

using namespace std;

int dfs( vector< vector<int> > &board, const int &h, const int &w, int y, int x )
{
	if ( !( 0 <= y && y < h && 0 <= x && x < w ) || 
		board[y][x] == 0 )
	{
		return 0;
	}

	board[y][x] = 0;

	for ( int i = -1; i <= 1; i++ )
	{
		for ( int j = -1; j <= 1; j++ )
		{
			dfs( board, h, w, y + i, x + j );
		}
	}
	return 1;
}

int main()
{
	while ( true )
	{
		int w, h;
		cin >> w >> h;

		if ( !( w | h ) )
		{
			break;
		}

		vector< vector<int> > board( h, vector<int>( w ) );

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

		int res = 0;

		for ( int i = 0; i < h; i++ )
		{
			for ( int j = 0; j < w; j++ )
			{
				res += dfs( board, h, w, i, j );
			}
		}

		cout << res << endl;
	}

	return 0;
}

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

int W,H;
vector<vector<int> > c;

void dfs(int h, int w){
    c[h][w] = 0;

    for(int i=-1;i<=1;++i){
        for(int j=-1;j<=1;++j){
            int nh = h + i, nw = w + j;

            if(nh < 0 || nh >= H || nw < 0 || nw >= W) continue;
            if(c[nh][nw] == 0) continue;

            dfs(nh, nw);
        }
    }
}

int main(){
    while(cin >> W >> H){
        if(H == 0 || W == 0) break;
        c.assign(H, vector<int>(W, 0));
        for(int i=0;i<H;++i){
            for(int j=0;j<W;++j){
                cin >> c[i][j];
            }
        }

        int count = 0;
        for(int i=0;i<H;++i){
            for(int j=0;j<W;++j){
                if(c[i][j] == 0) continue;
                dfs(i, j);
                count ++;
            }
        }
        cout << count << endl;
    }
}

C++: #include <bits/stdc++.h>
#define debug(x) cerr << #x << ": " << x << '\n';
using namespace std;
using ll = long long;
using P = pair<int, int>;
const int INF = (int)1e9;

int w, h;
int c[51][51];
int dx[] = {1, -1, 0, 0, 1, 1, -1, -1};
int dy[] = {0, 0, 1, -1, 1, -1, 1, -1};

void dfs(int y, int x){
	c[y][x] = 0;
	for(int i = 0; i < 8; i++){
		int ny = y + dy[i], nx = x + dx[i];
		if(0<=ny and ny<h and 0<=nx and nx<w and c[ny][nx]==1){
			dfs(ny, nx);
		}
	}
}

int solve(){
	int res = 0;
	for(int i = 0; i < h; i++){
		for(int j = 0; j < w; j++){
			if(c[i][j] == 1){
				dfs(i, j);
				res++;
			}
		}
	}

	return res;
}

int main(void){
	while(scanf("%d%d", &w, &h) != EOF){
		if(w == 0 and h == 0) break;
		for(int i = 0; i < h; i++){
			for(int j = 0; j < w; j++){
				scanf("%d", &(c[i][j]));
			}
		}
		printf("%d\n", solve());
	}

	return 0;
}

C++: #include<iostream>
#include<cstring>
#include<queue>

typedef std::pair<int, int> P;
int vx[] = { 0, 1, 0, -1, 1, 1, -1, -1 }, vy[] = { 1, 0, -1, 0, 1, -1, 1, -1 };
int w, h;
int map[51][51];

void bfs(int x, int y){

	map[y][x] = 0;

	std::queue<P>que;
	que.push(P(x, y));

	while (!que.empty()){

		P p = que.front();
		que.pop();

		for (int i = 0; i < 8; i++){
			int nx = p.first + vx[i], ny = p.second + vy[i];

			if (0 <= nx&&nx < w && 0 <= ny&&ny < h&&map[ny][nx] != 0){
				map[ny][nx] = 0;
				que.push(P(nx, ny));
			}
		}
	}

	return;
}

int main(){

	while (std::cin >> w >> h, w || h){

		int cnt = 0;

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

		for (int i = 0; i < h; i++){
			for (int j = 0; j < w; j++){
				if (map[i][j] != 0){
					bfs(j, i);
					cnt++;
				}
			}
		}

		std::cout << cnt << std::endl;
	}

	return 0;
}

C++: #include <iostream>
using namespace std;
int w, h;
int c[55][55];

void dfs(int y, int x) {
    c[y][x] = 0;
    for (int dh = -1; dh <= 1; dh++) {
        for (int dw = -1; dw <= 1; dw++) {
            int nh = y + dh, nw = x + dw;
            if (0 <= nh && 0 <= nw && nh < h && nw < w && c[nh][nw]) {
                dfs(nh, nw);
            }
        }
    }
}

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

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

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

int fill(vector<vector<bool> >& map, int y, int x){
    if(!map[y][x]) return 0;
    map[y][x] = false;
    for(int i=0; i<8; i++){
        fill(map, y+dy[i], x+dx[i]);
    }
    return 1;
}
        
int main(){
    while(1){
        int w,h;
        cin >> w >> h;
        if(w==0) break;

        vector<vector<bool> > map(h+2, vector<bool>(w+2, false));
        for(int i=1; i<=h; i++){
            for(int j=1; j<=w; j++){
                int tmp;
                cin >> tmp;
                if(tmp==1) map[i][j]=true;
            }
        }

        int count=0;
        for(int i=1; i<=h; i++){
            for(int j=1; j<=w; j++){
                count+= fill(map, i,j);
            }
        }
        cout << count << endl;
    }   
    return 0;
}