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<iomanip>
#include<cmath>
#include<string>
#include<vector>
#include<list>
#include<algorithm>
#include<map>
#include<set>
#include<queue>
#include<stack>
using namespace std;
typedef long long ll;
#define fi first
#define se second
#define mp make_pair
#define rep(i, n) for(int i=0;i<n;++i)
#define rrep(i, n) for(int i=n;i>=0;--i)
const int inf=1e9+7;
const ll mod=1e9+7;
const ll big=1e18;
const double PI=2*asin(1);

int main() {
    int W, H;
    int island[55][55];
    int ans;
    vector<int> ansarr;
    queue<pair<int, int> > que;
    pair<int, int> state;
    while(true){
        cin>>W>>H;
        if((W==0) && (H==0)) break;
        for(int i=0;i<H;++i){
            for(int j=0;j<W;++j){
                cin>>island[i][j];
            }
        }
        ans = 0;
        for(int i=0;i<H;++i){
            for(int j=0;j<W;++j){
                if(island[i][j]==1){
                    ans++;
                    que.push(mp(i, j));
                    while(!que.empty()){
                        state = que.front();que.pop();
                        if(island[state.fi][state.se]==0) continue;
                        island[state.fi][state.se] = 0;
                        if((state.fi>0) && (island[state.fi-1][state.se]==1)){
                            que.push(mp(state.fi-1, state.se));
                        }
                        if((state.fi<H-1) && (island[state.fi+1][state.se]==1)){
                            que.push(mp(state.fi+1, state.se));
                        }
                        if((state.se>0) && (island[state.fi][state.se-1]==1)){
                            que.push(mp(state.fi, state.se-1));
                        }
                        if((state.se<W-1) && (island[state.fi][state.se+1]==1)){
                            que.push(mp(state.fi, state.se+1));
                        }
                        if((state.fi>0) && (state.se>0) && (island[state.fi-1][state.se-1]==1)){
                            que.push(mp(state.fi-1, state.se-1));
                        }
                        if((state.fi>0) && (state.se<W-1) && (island[state.fi-1][state.se+1]==1)){
                            que.push(mp(state.fi-1, state.se+1));
                        }
                        if((state.fi<H-1) && (state.se>0) && (island[state.fi+1][state.se-1]==1)){
                            que.push(mp(state.fi+1, state.se-1));
                        }
                        if((state.fi<H-1) && (state.se<W-1) && (island[state.fi+1][state.se+1]==1)){
                            que.push(mp(state.fi+1, state.se+1));
                        }
                    }
                }
            }
        }
        ansarr.push_back(ans);
    }
    for(int i=0;i<ansarr.size();++i){
        cout<<ansarr[i]<<endl;
    }
}

C++: #include <iostream>
#include <algorithm>
using namespace std;
int m[55][55];

void fill_(int x,int y,int i){
    if(m[x][y]!=1){
        return;
    }
    m[x][y]=i;
    for(int dx=-1;dx<=1;++dx){
        for(int dy=-1;dy<=1;++dy){
            if(dx||dy){
                fill_(x+dx,y+dy,i);
            }
        }
    }
}

int main(void){
    // Your code here!
    while(1){
        for(int i=0;i<55;++i)fill(m[i],m[i]+55,-1);
        
        
        int w,h;
        cin>>w>>h;
        if(w==0&&h==0)break;
        for(int x=0; x<h;++x){
            for(int y=0;y<w;++y){
                int t;cin>>t;
                m[x+1][y+1]=t;
            }
        }
        int res=0;
        for(int x=1;x<=h;++x){
            for(int y=1;y<=w;++y){
                if(m[x][y]==1){
                    ++res;
                    fill_(x,y,res+1);
                }
            }
        }
        cout<<res<<endl;
    }
}

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

int w, h;
char c[51][51];

void dfs(int x, int y) {
	c[x][y] = 0;
	for (int i = -1; i <= 1; i++) {
		for (int j = -1; j <= 1; j++) {
			int nx = x + i, ny = y + j;
			if (0 <= nx&&nx < h && 0 <= ny&&ny < w&&c[nx][ny])
				dfs(nx, ny);
		}
	}
}
int main() {
	while (scanf("%d%d", &w, &h), w) {
		rep(i, h)rep(j, w)scanf("%d", &c[i][j]);
		int cnt = 0;
		rep(i, h)rep(j, w) {
			if (c[i][j]) {
				dfs(i, j);
				cnt++;
			}
		}
		printf("%d\n", cnt);
	}
}

C++: #include <iostream>
using namespace std;
int W,H,c[50][50];
void island(int h, int w){
    c[h][w]=0;
    for(int i=h-1; i<h+2; i++){
        for(int j=w-1; j<w+2; j++){
            if(c[i][j]==1 && i>=0 && j>=0 && i<H && j<W) island(i,j);
        }
    }
}

int main(void){
    int count;
    while(1){
        cin>>W>>H;
        count=0;
        if(W==0 && H==0) break;
        for(int i=0; i<H; i++){
            for(int j=0; j<W; j++){
                cin>>c[i][j];
            }
        }
        for(int i=0; i<H; i++){
            for(int j=0; j<W; j++){
                if(c[i][j]==1){
                    count++;
                    island(i,j);
                }
            }
        }
        cout<<count<<endl;
    }
}

C++: #include<iostream>
#include<cstdio>
#include<algorithm>
using namespace std;
int island[52][52];
void func(int,int);

int main(){
  int w,h;
  int ans;
  
  while(1){
    cin>>w>>h;
    if(w==0 && h==0) break;
    ans=0;
    fill(island[0],island[52],0);
    
    for(int i=1;i<=h;i++){
      for(int l=1;l<=w;l++){
        cin>>island[i][l];
      }
    }
    
    for(int i=1;i<=h;i++){
      for(int l=1;l<=w;l++){
        if(island[i][l]==1){
          func(i,l);
          ans++;
        }
      }
    }
    printf("%d\n",ans);
  }
  return 0;
}

void func(int x,int y){
  island[x][y]=0;
  for(int i=x-1;i<x+2;i++){
    for(int l=y-1;l<y+2;l++){
      if(island[i][l]==1)
        func(i,l);
    }
  }
}