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<iostream>
using namespace std;

int checkMap(int w, int h, int map[52][52]){
	if(map[w][h]){
		map[w][h]=0;
		 checkMap(w+1, h+1, map);
		 checkMap(w+1, h, map);
		 checkMap(w+1, h-1, map);
		 checkMap(w, h-1, map);
		 checkMap(w-1, h-1, map);
		 checkMap(w-1, h, map);
		 checkMap(w-1, h+1, map);
		 checkMap(w, h+1, map);
		 return 1;
	}else return 0;
		 
}


int main(){
	int w,h;

	while(cin >> w >> h, w){
	int map[52][52] = {{0}};
		int ans=0;
		for(int i = 1; i <= h; i++){
			for(int j = 1; j <= w; j++){
				cin >> map[i][j];
			}
		}
		for(int i = 1; i <= h; i++){
			for(int j = 1; j <= w; j++){
			ans += checkMap(i, j, map);
			}
		}
		cout << ans << endl;
	}
}

C++: #include <iostream>
using namespace std;
int w,h;
int in[100][100];
bool seen[100][100];
int ans =0;
bool flag = false;

void solve(int i,int j){
    //cout << i << " " << j << endl;
    if(i < 0 || j < 0 || i >= h || j >= w){
        return;
    }
    if(seen[i][j]){
        return;
    }
    if(in[i][j] == 0){
        return;
    }
    seen[i][j] = true;
    solve(i-1,j-1);
    solve(i-1,j);
    solve(i-1,j+1);
    solve(i,j-1);
    solve(i,j+1);
    solve(i+1,j-1);
    solve(i+1,j);
    solve(i+1,j+1);

}
int main(){
    cin >> w >> h;
    for(int i=0;i<h;i++){
        for(int j=0;j<w;j++){
            cin >> in[i][j];
        }
    }
    for(int i=0;i<h;i++){
        for(int j=0;j<w;j++){
            if(seen[i][j] == true || in[i][j] == 0){
            }
            else{
                solve(i,j);
                ans++;
            }
            
        }
    }
    if(w == 0 || h == 0){
    }
    else{
        cout << ans << endl;
    }
    return 0;
}

C++: #include <algorithm>
#include <iostream>
#include <queue>
#include <cmath>
#include <string>
#include <iterator>
#include <map>
#include <set>
#include <iomanip>
#include <vector>
using namespace std;
using ll = long long;
using ld = long double;
using P = pair<int, int>;
using Graph = vector<vector<int>>;
int dx[] = {0, 1, 0, -1, 1, -1,-1,1};
int dy[] = {1, 0, -1, 0, 1, 1,-1,-1};
#define INF 1000000000000
#define MAX 200001
#define MOD 1000000007
ll fac[MAX], finv[MAX], inv[MAX];
const int MX = 1000005;
vector<int> d(100,0);
vector<int> f(100,0);

void dfs(int x,int y,Graph &G,Graph &visited){
    visited[y][x]=1;
    for(int A=0;A<8;A++){
        int n_x=x + dx[A];
        int n_y=y + dy[A];
        if(n_x<0 or 49<n_x or n_y<0 or 49<n_y) continue;
        if(G[n_y][n_x]==1&&visited[n_y][n_x]==0){
            dfs(n_x,n_y,G,visited);
        }
    }
}

int main(){
    vector<int> res;
    while(true){
        vector<vector<int>> visited(50,vector<int>(50,0));
        int w,h;cin>>w>>h;
        int ans=0;
        if(w==0&&h==0) break;
        vector<vector<int>> G(50,vector<int>(50,0));
        for(int i=0;i<h;i++){
            for(int j=0;j<w;j++) cin>>G[i][j];
        }
        for(int i=0;i<h;i++){
            for(int j=0;j<w;j++){
                if(G[i][j]==1&&visited[i][j]==0){
                    dfs(j,i,G,visited);
                    ans++;
                }
            }
        }
        res.push_back(ans);
    }
    int s=res.size();
    for(int i=0;i<s;i++) cout<<res[i]<<endl;
}

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

using namespace std;

struct node{
  int x,y;
};

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

int main(){
  int w,h,i,j,k,ans=0;
  while(1){
    queue<node> que;
    scanf("%d %d",&w, &h);
    if(w+h == 0)break;
    int c[h][w];
    ans = 0;
    node now,next,to;
    for(i=0;i<h;i++){
      for(j=0;j<w;j++)scanf("%d",&c[i][j]);
    }
    for(i=0;i<h;i++){
      for(j=0;j<w;j++){
        if(c[i][j]){
          ++ans;
          now.x = j; now.y = i;
          que.push(now);
          while(!que.empty()){
            next = que.front();
            c[next.y][next.x] = 0;
            que.pop();
            for(k=0;k<8;k++){
              to.x = next.x + dx[k];
              to.y = next.y + dy[k];
              if(to.x<0 || to.x >=w || to.y<0 || to.y >=h || c[to.y][to.x]==0)continue;
              que.push(to);
            }
          }
        }
      }
    }
    printf("%d",ans);
  }
  return 0;
}