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>

using namespace std;

int w, h;
int m[50][50];
void paint(int x, int y) {
	if (x < 0 || x >= w || y < 0 || y >= h) return;
	if (m[y][x] == 0) return;
	m[y][x] = 0;
	for (int dx = -1; dx <= 1; ++dx) for (int dy = -1; dy <= 1; ++dy) {
		paint(x + dx, y + dy);
	}
}
int main() {
	while (cin >> w >> h, w || h) {
		for (int y = 0; y < h; ++y) {
			for (int x = 0; x < w; ++x) {
				cin >> m[y][x];
			}
		}
		int ans = 0;
		for (int y = 0; y < h; ++y) {
			for (int x = 0; x < w; ++x) {
				if (m[y][x]) {
					paint(x, y);
					++ans;
				}
			}
		}
		cout << ans << endl;
	}
}

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

#define rep(i, a) for (int i = 0; i < a; i++)
#define reps(i, a, b) for (int i = a; i < b; i++)

int W, H;
bool m[52][52];

void reset()
{
	rep(i, 52) rep(j, 52) m[i][j] = false;	
}

void saiki(int r, int c)
{
	if (!m[r][c]) return;
	m[r][c] = false;
	int dr[] = {-1, -1, -1,  0,  0,  1,  1,  1};
	int dc[] = {-1,  0,  1, -1,  1, -1,  0,  1};
	rep(i, 8) saiki(r+dr[i], c+dc[i]);
}


int main(void){
	cin >> W >> H;
	while (H != 0) {
		reset();
		rep(i, H) rep(j, W) {
			int t;
			cin >> t;
			m[i+1][j+1] = t == 1;
		}
		int res = 0;
		rep(i, H) rep(j, W) {
			if (m[i+1][j+1]) {
				res++;
				saiki(i+1, j+1);
			}
		}
		cout << res << endl;
		cin >> W >> H;
	}
}

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

using namespace std;

typedef long long ll;
typedef pair<int,int> P;

int c[100][100];//0??????
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(j,i);
              res++;
          }
      }
      cout<<res<<endl;
  }
}

C++: #include <iostream>

#define MAX 51

int map[MAX][MAX];
int w, h;

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


int main()
{

    int cnt;

    while(std::cin >> w >> h, w+h) {
        cnt = 0;
        for (int i = 0; i < h; i++) {
            for (int j = 0; j < w; j++) {
                std::cin >> map[i][j];
            }
        }

        for (int i = 0; i < h; i++) {
            for (int j = 0; j < w; j++) {
                if (map[i][j] == 1) {
                    cnt++;
                    dfs(i, j);
                }
            }
        }

        std::cout << cnt << std::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;w=0;}printf("%d\n",a);main();}

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

const int hmax = 50;
int w, h;
void move(string area[], int i, int j){
	area[i][j] = '0';
	for(int k = -1; k <= 1; k++){
		for(int l = -1; l <= 1; l++){
			if(i+k < h && i+k >= 0 && j+l < w && j+l >= 0)
				if(area[i+k][j+l] == '1') move(area,i+k,j+l);
		}
	}
}

int main(){
	while(cin >> w >> h){
		string area[hmax];
		if(w == 0 && h == 0) break;
		for(int i = 0; i < h; i++){
			string s;
			for(int j = 0; j < w; j++){
				char c;
				cin >> c;
				s.push_back(c);
			}
			area[i] = s;
		}
		int count = 0;
		for(int i = 0; i < h; i++){
			for(int j = 0; j < w; j++){
				if(area[i][j] == '1'){
					count++;
					move(area,i,j);
				}
			}
		}
		cout << count << endl;
	}
	return 0;
}