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 <bits/stdc++.h>
using namespace std;

int state[100][100];
bool reached[100][100];
int w,h;

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

void dfs(int x, int y) {

	if(x==0 || w<x || y==0 || h<y || state[x][y] == 0)
		return;
	if(reached[x][y] == true)
		return;

	reached[x][y]=true;

	for(int i=0; i<8; i++) {
		dfs(x+dx[i],y+dy[i]);
	}
}

int main() {

	while(cin >> w >> h,w){
		memset(state, 0, sizeof(state));
		memset(reached, false, sizeof(reached));
		for(int i=1; i<=h; i++) {
			for(int j=1; j<=w; j++) {
				cin >> state[i][j];
			}
		}
		int count=0;
		for(int i=1; i<=w; i++) {
			for(int j=1; j<=h; j++) {
				if(reached[i][j]==true || state[i][j] == 0)
					continue;
				else{
					dfs(i,j);
					count++;
				}
			}
		}
		cout << count << endl;
	}
	return 0;
}

C++: #include <iostream>
#define MAXSIZE 50

using namespace std;

int cnt;
int island[MAXSIZE][MAXSIZE];

int check(int x, int y, int w, int h);

int main(int argc, char const *argv[])
{
	int w, h;

	while(cin >> w >> h, w | h)
	{
		for(int i = 0; i < h; i++)
		{
			for(int j = 0; j < w; j++)
			{
				cin >> island[i][j];
			}
		}

		/* processor */	
		cnt = 0;

		for(int x = 0; x < w; x++)
		{
			for(int y = 0; y < h; y++)
			{
				if(check(x, y, w, h))
				{
					cnt++;
				}
			}
		}

		cout << cnt << endl;
	}	

	return 0;
}

int check(int x, int y, int w, int h)
{
	int dx[] = {-1, 0, 1, 1, 1, 0, -1, -1};
	int dy[] = {-1, -1, -1, 0, 1, 1, 1, 0};

	if(island[y][x])
	{
		island[y][x] = 0;

		for(int i = 0; i < 8; i++)
		{
			if(x + dx[i] < 0 || x + dx[i] >= w || y + dy[i] < 0 || y + dy[i] >= h)
			{
				continue;
			}

			check(x + dx[i], y + dy[i], w, h);
		}

		return 1;
	}

	return 0;
}

C++: #include "iostream"
#include "climits"
#include "list"
#include "queue"
#include "stack"
#include "set"
#include "functional"
#include "algorithm"
#include "string"
#include "map"
#include "iomanip"
#include "random"

using namespace std;

const long long int MOD = 1000000007;
const long double EPS = 0.00000001;
const long double PI = 3.1415926535897932384626433;

long long int N, M, K, H, W, L, R;


int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);

	cin >> W>>H;
	while (H) {
		N = 0;
		vector<vector<int>>field(H + 2, vector<int>(W + 2, 0));
		for (int i = 1; i <= H; i++) {
			for (int j = 1; j <= W; j++) {
				cin >> field[i][j];
			}
		}
		for (int i = 1; i <= H; i++) {
			for (int j = 1; j <= W; j++) {
				queue<pair<int, int>>Q;
				if (field[i][j]) {
					field[i][j] = 0;
					Q.push({ i,j });
					N++;
					while (!Q.empty()) {
						int cy = Q.front().first;
						int cx = Q.front().second;
						//cout << N << " " << cy << " " << cx << endl;
						Q.pop();
						
						for (int k = -1; k <= 1; k++) {
							for (int l = -1; l <= 1; l++) {
								if (field[cy + k][cx + l]) {
									field[cy + k][cx + l] = 0;
									Q.push({ cy + k,cx + l });
								}
							}
						}
					}
				}
			}
		}
		cout << N << endl;
		cin >> W >> H;
	}
	return 0;
}

C++: #include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<int,int> P;
typedef vector<int> VI;
typedef vector<VI> VVI;
const double PI = 3.14159265358979323846;
const double EPS = 1e-12;
const int INF = numeric_limits<int>::max() / 2;
const int NEG_INF = numeric_limits<int>::min() / 2;
const int MOD=1e9+7;

int c[100][100];//0　海
int h,w;

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

void bfs(int i,int j){
    queue<P> q;
    q.push(P(i,j));
    while(!q.empty()){
        int x=q.front().first,y=q.front().second;
        q.pop();
        c[x][y]=0;
        for(int i=0;i<8;i++){
            int nx=x+dx[i],ny=y+dy[i];
            if(0<=nx&&nx<h&&0<=ny&&ny<w&&c[nx][ny]==1){
                q.push(P(nx,ny));
            }
        }
    }
}

int main(){
  cin.tie(0);
  ios::sync_with_stdio(false);

  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>>c[i][j];
      }
      int res=0;
      for(int i=0;i<h;i++)for(int j=0;j<w;j++){
          if(c[i][j]==1){
              bfs(i,j);
              res++;
          }
      }
      cout<<res<<endl;
  }
}

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

int w, h;
int c[50][50];

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

int main(){
  	cin >> w >> h;
    while(w!=0){
        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]==1){
                    dfs(i, j);
                    ans++;
                }
            }
        }
        cout << ans << endl;
      	cin >> w >> h;
    }
}