Go: package main

import (
	"fmt"
)

func main() {
	var h, w int
	for {
		fmt.Scan(&w, &h)
		if w == 0 && h == 0 {
			return
		}
		matrix := make([][]int, h)
		Sean := make([][]bool, h)
		for i := 0; i < h; i++ {
			matrix[i] = make([]int, w)
			Sean[i] = make([]bool, w)
			for j := 0; j < w; j++ {
				fmt.Scan(&matrix[i][j])
			}
		}
		var count int
		for i := 0; i < h; i++ {
			for j := 0; j < w; j++ {
				if matrix[i][j] == 1 && Sean[i][j] == false {
					search(i, j, h, w, matrix, Sean)
					count++
				}
			}
		}
		fmt.Println(count)
	}
}
func search(x int, y int, h int, w int, matrix [][]int, Sean [][]bool) {
	if x < 0 || y < 0 || x >= h || y >= w || matrix[x][y] == 0 {
		return
	}
	if Sean[x][y] == true {
		return
	}

	Sean[x][y] = true

	search(x+1, y, h, w, matrix, Sean)
	search(x-1, y, h, w, matrix, Sean)
	search(x, y+1, h, w, matrix, Sean)
	search(x, y-1, h, w, matrix, Sean)
	search(x+1, y-1, h, w, matrix, Sean)
	search(x-1, y+1, h, w, matrix, Sean)
	search(x+1, y+1, h, w, matrix, Sean)
	search(x-1, y-1, h, w, matrix, Sean)
}

C++: #include <iostream>
#include <fstream>
#include <stdio.h>

using namespace std;

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

typedef struct Point{
    int x;
    int y;
}Point;

bool solve(Point p, int *a){
    
    int res = *a;
    if(c[p.y][p.x] == 1){
        res++;
        c[p.y][p.x] = 0;
        for(int i=-1; i<2; i++){
            for(int j=-1; j<2; j++){
                if(!(i==0 && j==0)){
                    if(0<=p.y+i && p.y+i <h && 0<=p.x+j && p.x+j <w){
                        if(c[p.y+i][p.x+j] == 1){
                        solve(Point{p.x+j,p.y+i}, &res);
                        }
                    }
                }
            }
        }
    }
    
    if(res>0)
    return true;
    
    return false;
}

int main(int argc, const char * argv[]) {
    // insert code here...
    /////////
    //write//
    /////////
    
    while(1){
        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 a = 0;
        int cnt = 0;
        for(int i=0; i<h; i++){
            for(int j=0; j<w; j++){
                if(solve(Point{j,i}, &a)){
                    //cout << "x:" << j << ",y:" << i << endl;
                    cnt++;
                }
            }
        }
        
        cout << cnt << endl;
    }
    
    return 0;
}

C++: #include<bits/stdc++.h>
#define rep(i,n) for(int i = 0;i<n;i++)
using namespace std;
typedef pair<int,int> P;
typedef long long ll;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0;}
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0;}

int w,h;
int c[55][55];

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

int main() {
    while(true) {
        cin >> w >> h;
        if(w == 0 && h == 0) break;
        rep(i,h) rep(j,w) {
            cin >> c[i][j];
        }
        int ans = 0;
        rep(i,h) rep(j,w) {
            if(c[i][j] == 1) {
                ans++;
                dfs(i,j);
            }
        }
        cout << ans << endl;
    }    
}

C++: #include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0;i<n;++i)
vector<vector<int>> C(50,vector<int>(50));
int cnt=0,w,h;

void dfs(int x,int y){
    C.at(x).at(y) = 0;
    for(int i=-1;i<2;++i){
        for(int j=-1;j<2;++j){
            int nh = x + i;
            int nw = y + j;
            if(0<=nw&&nw<w&&0<=nh&&nh<h&&C.at(nh).at(nw)==1){
            dfs(nh,nw);
            }
        }
        
    }
}

int main(){
    while(true){
        cin >> w >> h;
        if(w==0&&h==0){
            return 0;
        }
        rep(i,50){
            rep(j,50){
                C.at(i).at(j) = 0;
            }
        }
        cnt = 0;
        rep(i,h){
            rep(j,w){
                cin >> C.at(i).at(j);
            }
        }
       rep(i,h){
            rep(j,w){
                if(C.at(i).at(j)==1){
                    dfs(i,j);
                    ++cnt;
                }   
            }
        }
        cout << cnt << endl;    
    }
}

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

#define FOR(i,a,b) for(int i=(a);i<(int)(b);i++)
#define rep(i,n) FOR(i,0,n)
#define ZERO(a) memset(a,0,sizeof(a))

const int M = 55;
int w,h;
int f[M][M];
int dx[] = {1,1,1,0,0,-1,-1,-1};
int dy[] = {0,1,-1,1,-1,0,1,-1};

void dfs(int x, int y) {
    if(x == w || y == h) return ;
    f[y][x] = 0;
    rep(i,8) {
        int nx = x+dx[i], ny = y+dy[i];
        if(f[ny][nx] == 1)
            dfs(nx, ny);
    }
}

int main() {
    while(cin>>w>>h && w) {
        ZERO(f);
        rep(i,h) rep(j,w) cin >> f[i][j];

        int ans = 0;
        rep(i,h) rep(j,w) {
            if(f[i][j] == 0) continue;
            dfs(j,i);
            ans++;
        }

        cout << ans << endl;
    }

    return 0;
}

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

using namespace std;

int w = 0;
int h = 0;
vector<vector<int>> island;
vector<vector<bool>> reached;

void go(int x_pos, int y_pos);

int main()
{
    while(1){
        cin >> w >> h;
        if(w == 0) break;
        
        island.resize(h);        
        for(int i = 0; i < h; i++){
            island[i].resize(w);
        }
        for(int i = 0; i < h; i++){
            for(int j = 0; j < w; j++){
                cin >> island[i][j];
            }
        }

        reached.resize(h);
        for(int i = 0; i < h; i++){
            reached[i].resize(w);
        }
        for(int i = 0; i < h; i++){
            for(int j = 0; j < w; j++){
                reached[i][j] = false;
            }
        }


        int count = 0;
        for(int i = 0; i < h; i++){
            for(int j = 0; j < w; j++){
                if(island[i][j] == 1 && !reached[i][j]){
                    count++;
                    go(j, i);
                }
            }
        }
        
        cout << count << endl;
        
    }
    return 0;
}

void go(int x_pos, int y_pos)
{
    reached[y_pos][x_pos] = true;
    for(int dx = -1; dx <= 1; dx++){
        for(int dy = -1; dy <= 1; dy++){
            if(x_pos + dx >= 0 && x_pos + dx < w && y_pos + dy >= 0 && y_pos + dy < h){
                if(island[y_pos+dy][x_pos+dx] == 1 && !reached[y_pos+dy][x_pos+dx]){
                    go(x_pos+dx, y_pos+dy);
                }
            }
        }
    }
}

C++: #include <iostream>
#include <string>
#include <vector>
#include <cmath>
#include <algorithm>
#include <cstdlib>
#include <ctime>
#include <cstdio>
#include <functional>
#include <set>
#include <sstream>
#include <map>
#include <queue>

using namespace std;
 
const double eps=1e-10;

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

int main()
{

	int w,h;
	while(cin>>w>>h,w){
		vector< vector<int> > table(h,vector<int>(w));
		int res=0;
		for(int y=0;y<h;y++){
			for(int x=0;x<w;x++) cin>>table[y][x];
		}

		queue< pair<int,int> > q;

		for(int i=0;i<h;i++){
			for(int j=0;j<w;j++){

				if(table[i][j]==0) continue;

				res++;
				q.push(make_pair(i,j));

				while(!q.empty()){
					pair<int,int> p=q.front();
					q.pop();
					int y=p.first,x=p.second;

//					cout<<y<<" "<<x<<endl;

					if(table[y][x]==0) continue;

					table[y][x]=0;
					for(int k=0;k<8;k++){
						int nx=x+dx[k],ny=y+dy[k];
						if(0<=nx && nx<w && 0<=ny && ny<h && table[ny][nx]==1) q.push(make_pair(ny,nx));
					}
				}
			}
		}
		cout<<res<<endl;

	}


	return 0;
}