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<queue>
using namespace std;

int main(){
  int w,h;
  int dx[8] = {1,1,0,-1,-1,-1,0,1};
  int dy[8] = {0,1,1,1,0,-1,-1,-1};
  while(true){
  cin>>w>>h;
  if(!w&&!h)break;
  w+=2,h+=2;
  int island[w][h];
  for(int x=0;x<w;x++){
    island[x][0] = 0;
    island[x][h-1] = 0;
  }
  for(int y=1;y<h-1;y++){
    island[0][y] = 0;
    island[w-1][y] = 0;
    for(int x=1;x<w-1;x++){
      cin>>island[x][y];
    }
  }
  int count = 0;
  queue<int> qu;
  for(int y=1;y<h-1;y++){
    for(int x=1;x<w-1;x++){
      if(island[x][y]){
	qu.push(y*w+x);
	while(!qu.empty()){
	  if(island[qu.front()%w][qu.front()/w]){
	    island[qu.front()%w][qu.front()/w] = 0;
	    for(int i=0;i<8;i++)
	      qu.push(qu.front()+dy[i]*w+dx[i]);
	  }
	  qu.pop();
	}
	count++;
      }
    }
  }
  cout<<count<<endl;
  }
  return 0;
}

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

char c[102][102];

int mx, my;

void dfs(int x, int y){
    if(x < 0 || y < 0 || x >= mx || y >= my){
        return;
    }
    if(c[x][y] == '0'){
        return;
    }
    c[x][y] = '0';
    dfs(x+1, y);
    dfs(x+1, y+2);
    dfs(x+1, y-2);
    dfs(x-1, y);
    dfs(x-1, y+2);
    dfs(x-1, y-2);
    dfs(x, y+2);
    dfs(x, y-2);
    return;
}

int main(){
    int W, H, cnt = 0;
    scanf("%d %d\n", &W, &H);
    while(W != 0 || H != 0){
        mx = H;
        my = W;
        for(int k = 0; k < H; k++){
            cin.getline(c[k], sizeof(c[k]));
        }
        for(int i = 0; i < H; i++){
            for(int j = 0; j < W; j++){
                if(c[i][j] == '1'){
                    cnt++;
                    dfs(i, j);
                }
            }
        }
        cout << cnt << endl;
        scanf("%d %d\n", &W, &H);
        cnt = 0;
    }
}

C++: #include <iostream>
#include <vector>
#include <algorithm>
#include <set>
#include <queue>
#include <stack>
#include <string>
#include <map>
#include <cstdio>
#include <cstdlib>
#include <cmath>
 
#define rep(i, n) for(int i = 0; i < n; i ++)
#define ALL(T) T.begin(), T.end()
#define mp make_pair
#define pb push_back
#define X first
#define Y second

using namespace std;
 
typedef pair<int, int> pii;
typedef unsigned long long ull;
typedef vector<int> vi;
typedef vector<string> vs;
 
int cnt, w, h;
int m[100][100];
const int dx[8] = {-1, -1, -1, 0, 1, 1, 1, 0};
const int dy[8] = {-1, 0, 1, 1, 1, 0, -1, -1};

void dfs(pii);

int main(void){
    for(;cin >> w >> h, w; cout << cnt << endl){
        cnt = 0;
        rep(y, h) rep(x, w) cin >> m[y][x];
        rep(y, h) rep(x, w) if(m[y][x] == 1) cnt ++, dfs(mp(x, y));
    }
 
    return 0;
}

void dfs(pii p){
    if(p.X < 0 || w <= p.X ||
       p.Y < 0 || h <= p.Y) return;
    
    if(m[p.Y][p.X] == 1) m[p.Y][p.X] = 0;
    else return;

    rep(i, 8) dfs(mp(p.X + dx[i], p.Y + dy[i]));
}

C++: #include <bits/stdc++.h>
using namespace std;
bool island[50][50];
int n,m;
int dx[9]={0,1,1,1,0,-1,-1,-1},dy[9]={-1,-1,0,1,1,1,0,-1};
void serch(int y,int x)
{
	island[y][x]=0;
	for(int i=0,ax,ay;i<9;i++)if((ay=dy[i]+y)<m&&(ax=dx[i]+x)<n&&ay>=0&&ax>=0&&island[ay][ax])serch(ay,ax);
}
int main() {
	while(cin>>n>>m,n,m){
		int ans=0;
		for(int i=0;i<m;i++)for(int j=0;j<n;j++)cin>>island[i][j];
		for(int i=0;i<m;i++){
			for(int j=0;j<n;j++){
				if(island[i][j]){
					ans++;
					serch(i,j);
				}
			}
		}
		cout<<ans<<endl;
	}
}

C++: #include<iostream>
#include<vector>
#include<algorithm>

using namespace std;

int w,h;
int grid[51][51];

void dfs(int x,int y){
  if(grid[y][x]==0)return;
  grid[y][x]=0;
  for(int i=-1;i<2;i++){
    for(int j=-1;j<2;j++){
      int ny=y+i,nx=x+j;
      if(0<=nx && nx<w && 0<=ny && ny<h)dfs(nx,ny);
    }
  }
}

int main(void){

  while(cin >> w >> h,w|h){
    for(int i=0;i<h;i++)
      for(int j=0;j<w;j++)cin >> grid[i][j];
    
    int ans=0;
    for(int i=0;i<h;i++)
      for(int j=0;j<w;j++)
	if(grid[i][j]==1)ans++,dfs(j,i);
    cout << ans << endl;
  }

  return 0;
}

C++: #include<iostream>
#include<algorithm>

using namespace std;

int w,h;
int g[51][51];

void dfs(int x,int y){
  g[y][x]=0;
  for(int dy=-1;dy<=1;dy++){
    for(int dx=-1;dx<=1;dx++){
      int nx=x+dx,ny=y+dy;
      if(0<=nx && nx<w && 0<=ny && ny<h && g[ny][nx]==1)
	dfs(nx,ny);
    }
  }
}

int main(void){

  while(cin >> w >> h, w|h){
    for(int i=0;i<h;i++)
      for(int j=0;j<w;j++)cin >> g[i][j];
    
    int cnt=0;
    for(int i=0;i<h;i++)
      for(int j=0;j<w;j++)
	if(g[i][j]==1)cnt++,dfs(j,i);

    cout << cnt << endl;
  }
  
  return 0;
}

C++: #include <cstdio>
#define f(i,n)for(int i=0;i<n;i++)
#define s (scanf("%d",&e),e)
int main(){int a=0,w,n,m,b,e,d[99];f(i,99)d[i]=0;n=s;m=s;if(n==0)return 0;f(i,m){w=b=0;f(j,n){s;if(e)f(k,3){e=d[j+k];if(e&&e-w){if(w){f(l,n+2)d[l]=d[l]==e?w:d[l];a--;}else w=e;}if(w==0)a++,w=i*n+j+1;}else w=0;d[j]=b;b=w;}d[n]=b;}printf("%d\n",a);main();}