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 <algorithm>
#include <cstring>

using namespace std;

namespace {
    const int MAX_W = 50;
    const int MAX_H = 50;
    int W, H;
    int F[MAX_H][MAX_W];
    bool input() {
        cin >> W >> H;
        if (W == 0 && H == 0) return false;
        for (int i = 0; i < H; i++) {
            for (int j = 0; j < W; j++) {
                cin >> F[i][j];
            }
        }
        return true;
    }

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

    void solve() {
        bool used[H][W];
        memset(used, 0, sizeof(used));
        int ans = 0;
        for (int i = 0; i < H; i++) {
            for (int j = 0; j < W; j++) {
                if (F[i][j] == 0) continue;
                if (used[i][j]) continue;
                typedef pair<int, int> P;
                queue<P> Q;
                Q.push(P(i, j));
                ans++;
                used[i][j] = true;
                while (!Q.empty()) {
                    P c = Q.front(); Q.pop();
                    int y = c.first, x = c.second;
                    for (int k = 0; k < 8; k++) {
                        int ny = y + dy[k];
                        int nx = x + dx[k];
                        if (ny < 0 || ny >= H) continue;
                        if (nx < 0 || nx >= W) continue;
                        if (F[ny][nx] == 0) continue;
                        if (used[ny][nx]) continue;
                        used[ny][nx] = true;
                        Q.push(P(ny, nx));
                    }
                }
            }
        }
        cout << ans << endl;
    }
}

int main() {
    while (input()) solve();
    return 0;
}

C++: #include <iostream>
#include <sstream>
#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <ctime>
#include <cstring>
#include <string>
#include <vector>
#include <stack>
#include <queue>
#include <deque>
#include <map>
#include <set>
#include <bitset>
#include <numeric>
#include <utility>
#include <iomanip>
#include <algorithm>
#include <functional>

using namespace std;
#define ll long long
#define REP(i,x) for(int i=0;i<(int)(x);i++)
#define REPS(i,x) for(int i=1;i<=(int)(x);i++)
#define RREP(i,x) for(int i=((int)(x)-1);i>=0;i--)
#define RREPS(i,x) for(int i=((int)(x));i>0;i--)
const ll mod = 1e9 + 7;


int w;
int h;
vector<vector<int> > c(50, vector<int>(50));
vector<vector<bool> > reached(50, vector<bool>(50,false));

void dfs(int y, int x){
    reached.at(y).at(x) = true;

    for(int dy = -1; dy <= 1; dy++){
        for(int dx = -1; dx <= 1; dx++){
            int nx = x + dx;
            int ny = y + dy;
			if(ny < 0 || h <= ny || nx < 0 || w <= nx || c.at(ny).at(nx) == 0) continue;          
            if(reached.at(ny).at(nx)) continue;
            dfs(ny,nx);

       }
    }
    
}




int main (){
while(cin>>w>>h,w!=0&&h!=0){
	
  	
    REP(i,h){//y
        REP(j,w){//x
          	reached.at(i).at(j) = false;
            cin >> c.at(i).at(j);
        }
    }
    int ans = 0;
    REP(i,h){
        REP(j,w){
            if(!reached.at(i).at(j) && c.at(i).at(j) == 1){
                dfs(i,j);
                ans++;
            }
            
        }
    }

    cout << ans << endl;




}

    return 0;
}

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;
	}
}