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<stdio.h>
void printmap();
void draw(int x,int y);
int w,h,c[50][50];

int main(){
	int i,j;
	int count;


	scanf("%d %d",&w,&h);


	while((w!=0)&&(h!=0)){
		count=0;
	
		for(j=0;j<h;j++){
			for(i=0;i<w;i++){
				scanf("%d",&c[j][i]);
			}
		}
		//printf("\n");
		
		for(i=0;i<w;i++){
			c[h][i]=0;
		}
		for(i=0;i<h;i++){
			c[i][w]=0;
		}

		for(i=0;i<w;i++){
			for(j=0;j<h;j++){
				if(c[j][i]==1){
					count++;
					//printf("count up count=%d\n",count);
					draw(j,i);
					//printmap();
				}
			}
		}

		printf("%d\n",count);
		scanf("%d %d",&w,&h);
	}
	return 0;
}

void draw(int x,int y){
	//printf("delete %d %d\n",x,y);
	c[x][y]=0;
	if(c[x+1][y]==1){
		draw(x+1,y);
	}
	if(c[x-1][y]==1){
		draw(x-1,y);
	}
	if(c[x][y-1]==1){
		draw(x,y-1);
	}
	if(c[x][y+1]==1){
		draw(x,y+1);
	}

}

void printmap(){
	int i,j;
	for(j=0;j<h;j++){
		for(i=0;i<w;i++){
			printf("%d ",c[j][i]);
		}
		printf("\n");
	}
}

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

int w, h;
int map[50][50];
int ans;

void Suibotu(int y, int x)
{//??¨??????????????????????±?????????¶????????°???????°´????????????
	map[y][x] = 0;
	if(x<w-1 && map[y][x+1]==1)				//???
		Suibotu(y, x+1);
	if(x<w-1 && y<h-1 && map[y+1][x+1]==1)	//??????
		Suibotu(y+1, x+1);
	if(y<h-1 && map[y+1][x]==1)				//???
		Suibotu(y+1, x);
	if(x>0 && y<h-1 && map[y+1][x-1]==1)	//??????
		Suibotu(y+1, x-1);
	if(x>0 && map[y][x-1]==1)				//???
		Suibotu(y, x-1);
	if(x>0 && y>0 && map[y-1][x-1]==1)		//??????
		Suibotu(y-1, x-1);
	if(y>0 && map[y-1][x]==1)				//???
		Suibotu(y-1, x);
	if(x<w-1 && y>0 && map[y-1][x+1]==1)	//??????
		Suibotu(y-1, x+1);
}
int main(){
	cin >> w >> h;
	while(w+h>0){
		ans = 0;
		for(int i=0; i<h; i++)
			for(int j=0; j<w; j++)
				cin >> map[i][j];
			for(int i=0; i<h; i++)
			for(int j=0; j<w; j++)
				if(map[i][j]==1){
					ans++;
					Suibotu(i, j);
				}
		cout << ans << endl;
		cin >> w >> h;
	}
	return 0;
}

C++: #include <iostream>
#include <stack>
using namespace std;
int dx[] = { -1, 0, 1, 1, 1, 0, -1, -1 };
int dy[] = { -1, -1, -1, 0, 1, 1, 1, 0 };

int main(){
	int w, h;
	while( cin >> w >> h && w && h ){
		int field[50][50];
		stack< pair<int, int> > st;
		for( int i = 0; i < h; i++ ){
			for( int j = 0; j < w; j++ ){
				cin >> field[i][j];
			}
		}
		int sum = 0;
		for( int i = 0; i < h; i++ ){
			for( int j = 0; j < w; j++ ){
				if( field[i][j] == 1 ){
					sum++;
					field[i][j] = 0;
					st.push( pair<int, int>(i, j) );
					//cout << i << ' ' << j << endl;
					while( !st.empty() ){
						//cout << st.top().second << ' ' << st.top().first << endl;
						int x0 = st.top().second;
						int y0 = st.top().first;
						st.pop();
						for( int k = 0; k < 8; k++ ){
							int x = x0 + dx[k];
							int y = y0 + dy[k];
							if( 0 <= x && x < w && 0 <= y && y < h && field[y][x] == 1 ){
								st.push( pair<int, int>(y, x) );
								field[y][x] = 0;
								//cout << y << ' ' << x << endl;
							}
						}
					}
				}
			}
		}
		cout << sum << endl;
	}
}