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>
using namespace std;
int dx[] = {1,1,0,-1,-1,-1,0,1};
int dy[] = {0,1,1,1,0,-1,-1,-1};
int c[51][51];
int main()
{

	int w, h;

	while (cin >> w && cin >> h && w != 0 && h != 0)
	{
		for (int i = 1; i < h + 1; i++)
		{
			for (int j = 1; j < w + 1; j++)
			{
				int tmp;
				cin >> tmp;
				if (tmp == 0)
				{
					c[i][j] = -1;
				}
				else
				{
					c[i][j] = 0;
				}
			}
		}

		int count = 0;
		queue<pair<int,int>> q;
		for (int i = 1; i < h + 1; i++)
		{
			for (int j = 1; j < w + 1; j++)
			{
				if (c[i][j] != 0)continue;
				q.push(make_pair(i,j));
				c[i][j] = 1;
				while (q.size() > 0)
				{
					pair<int, int> p = q.front();
					q.pop();
					int y = p.first;
					int x = p.second;

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

						if (nx < 1 || ny < 1 || nx > w || ny > h)continue;
						if (c[ny][nx] != 0)continue;
						q.push(make_pair(ny, nx));
						c[ny][nx] = 1;
					}
				}
				count++;
			}
		}

		cout << count << endl;


	}

	return 0;
}

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

#define pb         push_back

const int INF = 100000000;

int w, h;
vector<int> ma[60];

void rec(int y, int x){
	int ny, nx;
	if(ma[y][x] != 1){
		return;
	}
	ma[y][x] = 0;
	for(int i=-1; i<=1; i++){
		for(int j=-1; j<=1; j++){
			if(i == 0 && j == 0) continue;
			nx =  x + i;
			ny =  y + j;
			if(ny >= 0 && ny < h && nx >= 0 && nx < w){
				rec(ny, nx);
			}
		}
	}
}
int main(void) {
	while(1){
		for(int i=0; i<60; i++){
			ma[i] = vector<int>();
		}
		cin >> w >> h;
		if(w == 0 && h == 0) break;

		for(int i = 0; i < h; i++){
			for(int j=0; j<w; j++){
				int t;
				cin >> t;
				ma[i].pb(t);
			}
		}

		int ans = 0;
		for(int i=0; i<h; i++){
			for(int j=0; j<w; j++){
				if(ma[i][j] == 1){
					ans++;
					rec(i, j);
				}
			}
		}
		/*
		for(int i=0; i<h; i++){
			for(int j=0; j<w; j++){
				cout << ma[i][j] << ' ';
			}
			cout << endl;
		}
		*/
		cout << ans << endl;
	}
	
	return 0;
}

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

#define FOR(i,k,n) for (int (i)=(k); (i)<(n); ++(i))
#define REP(i,n) FOR(i,0,n)

using namespace std;
vector <vector<int> > seamap, visit;

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

void bfs(int x, int y){
    queue <pair <int, int> > Q;
    visit[x][y] = 1;
    Q.push(pair<int,int>(x, y));
    while(!Q.empty()){
        pair<int,int> cur = Q.front();
        Q.pop();
        REP(i,8){
            nx = cur.first + dx[i];
            ny = cur.second + dy[i];
            if(seamap[nx][ny] && !visit[nx][ny]){
                visit[nx][ny] = 1;
                Q.push(pair<int,int>(nx, ny));
            }
        }
    }
}

int main(){
    int w,h;
    while(cin >> w >> h && !(w == 0 && h == 0)){
        int island = 0;
        seamap.resize(w + 2);
        REP(i,w + 2){
            seamap[i] = vector<int>(h + 2, 0);
        }
        visit = seamap;
        FOR(y,1,h + 1){
            FOR(x,1,w + 1){
                cin >> seamap[x][y];
            }
        }
       FOR(x,1,w + 1){
            FOR(y,1,h + 1){
                if(seamap[x][y] && !visit[x][y]){
                    island++;
                    bfs(x,y);
                }
            }
        }
        cout << island << endl;
    }
}

C++: #include <bits/stdc++.h>
#define rep(i, n) for(int i = 0; i < (n); ++i)
using namespace std;
using ll = long long;
using IslandsMap = vector<vector<int>>;
using CheckMap = vector<vector<bool>>;

int direction_x[8] = {0, 1, 1, 1, 0, -1, -1, -1};
int direction_y[8] = {1, 1, 0, -1, -1, -1, 0, 1};

int h,w;
IslandsMap islands_map;
CheckMap check_map;

void dfs(int x, int y) {
    int dx, dy;
    check_map[y][x] = true;
    rep(i, 8) {
        dx = x + direction_x[i];
        dy = y + direction_y[i];
        if(dx >= 0 && dx < w && dy >= 0 && dy < h &&
           check_map[dy][dx] == false && islands_map[dy][dx] == 1) {
            dfs(dx, dy);
        }
    }
}

int countIslands() {
    int ans = 0;
    rep(y, h) {
        rep(x, w) {
            if(check_map[y][x] == false && islands_map[y][x] == 1) {
                dfs(x, y);
                ans++;
            }
        }
    }
    return ans;
}

int main() {
    // 制約見て！！！デカかったらlong longにすること！
    int c;
    while(true) {
        cin >> w >> h;
        if(w == 0 && h == 0)
            break;

        islands_map.resize(h);
        rep(i, h) {
            islands_map[i].resize(w);
            rep(j, w) {
                cin >> c;
                islands_map[i][j] = c;
            }
        }

        check_map.resize(h);
        rep(i, h) {
            check_map[i].resize(w);
            check_map[i].assign(w,false);
        }
        cout << countIslands() << endl;
    }
}