Go: package main

import (
	"bufio"
	"fmt"
	"io"
	"math"
	"os"
	"strconv"
)

var (
	readString func() string
	readBytes  func() []byte
	stdout     *bufio.Writer
)

func init() {
	readString, readBytes = newReadString(os.Stdin)
	stdout = bufio.NewWriter(os.Stdout)
}

func newReadString(ior io.Reader) (func() string, func() []byte) {
	r := bufio.NewScanner(ior)
	r.Buffer(make([]byte, 1024), math.MaxInt32)
	r.Split(bufio.ScanWords)

	f1 := func() string {
		if !r.Scan() {
			panic("Scan failed")
		}
		return r.Text()
	}
	f2 := func() []byte {
		return []byte(f1())
	}
	return f1, f2
}

func readInt() int {
	return int(readInt64())
}

func readInt64() int64 {
	i, err := strconv.ParseInt(readString(), 10, 64)
	if err != nil {
		panic(err.Error())
	}
	return i
}

func readFloat64() float64 {
	f, err := strconv.ParseFloat(readString(), 64)
	if err != nil {
		panic(err.Error())
	}
	return f
}

func printf(f string, args ...interface{}) (int, error) {
	return fmt.Fprintf(stdout, f, args...)
}

func println(args ...interface{}) (int, error) {
	return fmt.Fprintln(stdout, args...)
}

func eprintln(args ...interface{}) (int, error) {
	return fmt.Fprintln(os.Stderr, args...)
}

func eprintf(f string, args ...interface{}) (int, error) {
	return fmt.Fprintf(os.Stderr, f, args...)
}

func min(a, b int) int {
	if a < b {
		return a
	}
	return b
}

func min64(a, b int64) int64 {
	if a < b {
		return a
	}
	return b
}

func max(a, b int) int {
	if a < b {
		return b
	}
	return a
}

func max64(a, b int64) int64 {
	if a < b {
		return b
	}
	return a
}

func abs(a int) int {
	if a < 0 {
		return -a
	}
	return a
}

func abs64(a int64) int64 {
	if a < 0 {
		return -a
	}
	return a
}

func gcd(a, b int) int {
	if b == 0 {
		return a
	}
	return gcd(b, a%b)
}

func gcd64(a, b int64) int64 {
	if b == 0 {
		return a
	}
	return gcd64(b, a%b)
}

// readString() string
// readInt() int
// readInt64() int64
// readFloat64() float64

// -----------------------------------------------------------------------------

func main() {
	defer stdout.Flush()

	for {
		ans, ok := solve()
		if !ok {
			break
		}
		println(ans)
	}

}

func solve() (int, bool) {
	w := readInt()
	h := readInt()
	if w == 0 && h == 0 {
		return 0, false
	}

	c := make([][]int, h+2)
	c[0] = make([]int, w+2)
	c[h+1] = make([]int, w+2)
	for i := 1; i-1 < h; i++ {
		c[i] = make([]int, w+2)
		for j := 1; j-1 < w; j++ {
			c[i][j] = readInt()
		}
	}

	var ans int
	for i := 1; i-1 < h; i++ {
		for j := 1; j-1 < w; j++ {
			if 0 < c[i][j] {
				ans++
				dfs(c, i, j)
			}
		}
	}
	return ans, true
}

func dfs(c [][]int, y, x int) {
	c[y][x] = 0
	dx := []int{-1, 0, 1, -1, 1, -1, 0, 1}
	dy := []int{-1, -1, -1, 0, 0, 1, 1, 1}
	for i := range dx {
		nx := x + dx[i]
		ny := y + dy[i]
		if 0 < c[ny][nx] {
			dfs(c, ny, nx)
		}
	}
}

// -----------------------------------------------------------------------------

C++: #include <bits/stdc++.h>
using namespace std;
int w,h,c[100][100],ans;
pair<int,int> movemy[8]={{0,1},{1,0},{1,1},{-1,0},{0,-1},{-1,1},{1,-1},{-1,-1}};


void land(int y,int x){
	if(y<0||y>h-1||x<0||x>w-1||c[y][x]==0)return;
	c[y][x]=0;
	for(int i=0;i<8;i++){
		land(y+movemy[i].first,x+movemy[i].second);
	}
}

int main(){
	while (1){
		ans=0;
		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];
				//cout<<"AAA"<<endl;
			}
		}
		//cout<<"AAA"<<endl;
		for(int i=0;i<h;i++){
			for(int j=0;j<w;j++){
				if(c[i][j]){land(i,j);ans++;}
				
			}
		}
		cout<<ans<<endl;
	}
}

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

using i64 = long long int;

int c[51][51] = {0};

void bfs(int w, int h, int x, int y){
    if(x < 0 || x >= w)return;
    if(y < 0 || y >= h)return;
    if(c[y][x] == 0)return;

    c[y][x] = 0;
    for(int dy=-1;dy<=1;++dy){
        for(int dx=-1;dx<=1;++dx)
            bfs(w, h, x+dx, y+dy);
    }
}

int main(){
    int w, h;
    while(cin >> w >> h, 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){
                    bfs(w, h, j, i);
                    ans++;
                }
            }
        }

        cout << ans << endl;
    }

    return 0;
}

C++: #include <iostream>
#include <vector>
#include <algorithm>
#include <utility>
#include <queue>
#include <set>
#include <stdio.h>
#include <string>
using namespace std;
#define ll long long

int W, H;
vector<vector<int>> field;

void dfs(int h, int w) {
	field[h][w] = 0;

	for (int dx = -1; dx <= 1; dx++) {
		for (int dy = -1; dy <= 1; dy++) {
			int nh = h + dy;
			int nw = w + dx;

			if (nh < 0 || nw < 0 || nh >= H || nw >= W)continue;
			if (field[nh][nw] == 0)continue;

			dfs(nh, nw);
		}
	}
}

int main() {
	while (1) {
		cin >> W >> H;
		if (W == 0 && H == 0)break;
		field.assign(H, vector<int>(W, 0));
		for (int i = 0; i < H; i++) {
			for (int j = 0; j < W; j++) {
				cin >> field[i][j];
			}
		}
		int ans = 0;
		for (int i = 0; i < H; i++) {
			for (int j = 0; j < W; j++) {
				if (field[i][j] == 0)continue;
				dfs(i, j);
				ans++;
			}
		}
		cout << ans << endl;
	}
	return 0;
}

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

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

int H, W;
int sima[55][55];

bool seen[55][55];
void dfs(int h, int w){
  seen[h][w] = true;
  for(int dir=0; dir<8; dir++){
    int nh = h + dy[dir];
    int nw = w + dx[dir];
    if(nh>=H || nh<0 || nw>=W || nw<0){
      continue;
    }
    if(sima[nh][nw] == 0){
      continue;
    }
    if(seen[nh][nw]){
      continue;
    }
    dfs(nh, nw);
  }
}

int main(){
  while(1){
    cin >> W >> H;
    if(H == 0 && W == 0){
      break;
    }
    for(int h=0; h<H; h++){
      for(int w=0; w<W; w++){
        cin >> sima[h][w];
      }
    }
    memset(seen, 0, sizeof(seen));
    int count=0;
    for(int i=0; i<H; i++){
      for(int j=0; j<W; j++){
        if(seen[i][j]){
          continue;
        }
        if(sima[i][j] == 0){
          continue;
        }
        dfs(i, j);
        count++;
      }
    }
    cout << count << endl;
  }
  return 0;
}

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

std::vector<int> dx{1, 1, 0, -1, -1, -1, 0, 1};
std::vector<int> dy{0, 1, 1, 1, 0, -1, -1, -1};

void dfs(std::vector<std::vector<bool>> &seen, std::vector<std::vector<int>> &map, int x, int y){
//    std::cout << x << ", " << y << std::endl;
    seen.at(y).at(x) = true;
    for(int i = 0; i < 8; ++i){
        int nextX = x + dx.at(i), nextY = y + dy.at(i);
        if(!seen.at(nextY).at(nextX) && 1 == map.at(nextY).at(nextX)){
            dfs(seen, map, nextX, nextY);
        }
    }
}

int main(){
    int w, h;
    while(std::cin >> w >> h){
        if(0 == w && 0 == h){
            break;
        }

        std::vector<std::vector<int>> map(h + 2, std::vector<int>(w + 2, 0));
        for(int i = 1; i <= h; ++i){
            for(int j = 1; j <= w; ++j){
                std::cin >> map.at(i).at(j); 
            }
        }

        std::vector<std::vector<bool>> seen(h + 2, std::vector<bool>(w + 2, false));
        int count = 0;
        for(int i = 1; i <= h; ++i){
            for(int j = 1; j <= w; ++j){
                if(!seen.at(i).at(j) && 1 == map.at(i).at(j)){
                    dfs(seen, map, j, i);
                    ++count;
                } 
            }
        }
    
        std::cout << count << std::endl;
    }

    return 0;
}