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 <bits/stdc++.h>

using namespace std;

int w, h;

vector<vector<int>> makearea(void) {
	vector<vector<int>> area(h);

	for(int i = 0; i < h; i++) {
		for(int j = 0; j < w; j++) {
			int tmp;
			cin >> tmp;
			area[i].push_back(tmp);
		}
	}
	
	/*for(auto i : area) {
		for(auto j : i) {
			cout << j << " ";
		}
		cout << endl;
	}*/

	return area;
}

void dfs(int y, int x, vector<vector<int>>& area, vector<vector<bool>>& checker) {
	if(x != w - 1) {
		if(area[y][x + 1] == 1 and checker[y][x + 1] == true) {
			checker[y][x + 1] = false;
			dfs(y, x + 1, area, checker);
		}
	}
	if(x != w - 1 and y != h - 1){
		if(area[y + 1][x + 1] == 1 and checker[y + 1][x + 1]) {
			checker[y + 1][x + 1] = false;
			dfs(y + 1, x + 1, area, checker);
		}
	}
	if(y != h - 1){
		if(area[y + 1][x] == 1 and checker[y + 1][x]) {
			checker[y + 1][x] = false;
			dfs(y + 1, x, area, checker);
		}
	}
	if(x != 0 and y != h - 1){
		if(area[y + 1][x - 1] == 1 and checker[y + 1][x - 1]) {
			checker[y + 1][x - 1] = false;
			dfs(y + 1, x - 1, area, checker);
		}
	}
	if(x != 0){
		if(area[y][x - 1] == 1 and checker[y][x - 1]) {
			checker[y][x - 1] = false;
			dfs(y, x - 1, area, checker);
		}
	}
	if(x != 0 and y != 0){
		if(area[y - 1][x - 1] == 1 and checker[y - 1][x - 1]) {
			checker[y - 1][x - 1] = false;
			dfs(y - 1, x - 1, area, checker);
		}
	}
	if(y != 0){
		if(area[y - 1][x] == 1 and checker[y - 1][x]) {
			checker[y - 1][x] = false;
			dfs(y - 1, x, area, checker);
		}
	}
	if(x != w - 1 and y != 0){
		if(area[y - 1][x + 1] == 1 and checker[y - 1][x + 1]) {
			checker[y - 1][x + 1] = false;
			dfs(y - 1, x + 1, area, checker);
		}
	}
}

int search(vector<vector<int>>& area) {
	int sum = 0;
	vector<vector<bool>> checker;
	checker = vector<vector<bool>>(area.size(), vector<bool>(area[0].size(), true));

	for(int i = 0; i < h; i++) {
		for(int j = 0; j < w; j ++) {
			if(area[i][j] == 1 and checker[i][j]) {
				checker[i][j] = false;
				dfs(i, j, area, checker);
				sum++;
			}
		}
	}
	return sum;
}

int main(void) {
	while(1) { 
		cin >> w >> h;
		if(w == 0 and h == 0) {
			break;
		}

		vector<vector<int>> area = makearea();
		int sum = search(area);

		cout << sum << endl;
	}
	return 0;
}

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

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

int main(void) {
	int w,h;
	while(cin >> w >> h && w && h) {
		vector< vector<int> > data(w+2,vector<int>(h+2,0));
		for (int i = 1; i <= h; ++i) {
			for (int j = 1; j <= w; ++j) {
				cin >> data[i][j];
			}
		}

		int nx,ny;
		int count = 0;
		queue<int> fx,fy;
		for (int i = 1; i <= h; ++i) {
			for (int j = 1; j <= w; ++j) {
				if (data[i][j] == 1) {
					nx = j;
					ny = i;
					data[i][j] = 0;
					fx.push(nx);
					fy.push(ny);
					++count;

					while (!fx.empty()) {
						nx = fx.front();
						ny = fy.front();
						fx.pop();
						fy.pop();
						for (int d = 0; d < 8; ++d) {
							if (data[ny+dy[d]][nx+dx[d]] == 1) {
								fx.push(nx+dx[d]);
								fy.push(ny+dy[d]);
								data[ny+dy[d]][nx+dx[d]] = 0;
							}
						}
					}
				}
			}
		}
		cout << count << endl;
	}
	return 0;
}

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

#define PIAR pair<int, int>

struct pos{
    int x;
    int y;
};

int main(){
    int w, h;
    while(cin >> w >> h, w != 0 && h != 0){
        int field[52][52] = {{0}};
        for(int i = 1; i <= h; i++){
            for(int j = 1; j <= w; j++){
                cin >> field[i][j];
            }
        }

        stack<PIAR> st;
        int island = 0;
        int dx[] = {-1,  0, 1, 0, -1,  1, 1, -1};
        int dy[] = {0 , -1, 0, 1, -1, -1, 1,  1};
        for(int i = 1; i <= h; i++){
            for(int j = 1; j <= w; j++){
                //島を探す
                if(field[i][j] == 1){
                    st.push(PIAR(i, j));
                    field[i][j] = 0;
                    while(!st.empty()){
                    	int x = st.top().first;
                    	int y = st.top().second;
                        st.pop();
                        for(int k = 0; k < 8; k++){
                            int nextX = x + dx[k];
                            int nextY = y + dy[k];
                            if(field[nextX][nextY] == 1){
                                st.push(PIAR(nextX, nextY));
                                field[nextX][nextY] = 0;
                            }
                        }
                    }
                    island++;
                }

            }
        }

        cout << island << endl;
    }
}