Go: ///
// File:  1160.go
// Author: ymiyamoto
//
// Created on Sun Mar  4 20:45:57 2018
//
package main

import (
	"fmt"
)

var w, h int
var graph [][]string

func dfs(visited [][]bool, x, y int) {
	visited[x][y] = true

	for i := -1; i <= 1; i++ {
		for j := -1; j <= 1; j++ {
			dx := x + i
			dy := y + j
			if 0 <= dx && dx < h && 0 <= dy && dy < w && graph[dx][dy] == "1" && !visited[dx][dy] {
				dfs(visited, dx, dy)
			}
		}
	}
}

func main() {
	for {
		fmt.Scan(&w, &h)
		if w == 0 && h == 0 {
			break
		}

		graph = make([][]string, h)
		for i := range graph {
			graph[i] = make([]string, w)
		}

		for i := 0; i < h; i++ {
			for j := 0; j < w; j++ {
				var s string
				fmt.Scan(&s)
				graph[i][j] = s
			}
		}

		visited := make([][]bool, h)
		for i := range visited {
			visited[i] = make([]bool, w)
		}

		count := 0
		for i := range graph {
			for j := range graph[i] {
				if graph[i][j] == "1" && !visited[i][j] {
					dfs(visited, i, j)
					count++
				}
			}
		}

		fmt.Println(count)
	}
}

C++: #include <iostream>
#include <string>
#include <vector>
#include <math.h>
#include <numeric>
#include <algorithm>
#include <stack>
using namespace std;
int grid[50][50];
int w, h, ans;
void dfs(int i, int j){ //iが縦jが横
    if(i<0||j<0||grid[i][j]==0) return ;
    grid[i][j]=0;
    
    for(int n=-1; n<=1; ++n){
        for(int m=-1; m<=1; ++m){
            dfs(i+n, j+m);
        }
    }
    return ;
}
int main() {
    while(cin >> w >> h, w||h){
        
        for(int i=0; i<h; ++i){
            for(int j=0; j<w; ++j){
                cin >> grid[i][j];
            }
        }
        ans = 0;
        for(int i=0; i<h; ++i){
            for(int j=0; j<w; ++j){
                if(grid[i][j]==1){
                    dfs(i, j);
                    ans++;
                }
            }
        }
        cout << ans << endl;
    }
        
    return 0;
}

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

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

int W, H, maze[64][64];
bool visited[64][64];

bool check(int x, int y){
	return x >= 0 && x < W && y >= 0 && y < H && maze[y][x] == 1 && !visited[y][x];
}

void dfs(int x, int y){
	visited[y][x] = true;
	
	for(int i = 0; i < 8; ++i){
		int nx = x + dx[i];
		int ny = y + dy[i];
		if(check(nx, ny)){
			dfs(nx, ny);
		}
	}
	return;
}

int main() {
	while(cin >> W >> H && (W || H)){
		memset(visited, 0, sizeof(visited));
		
		for(int i = 0; i < H; ++i){
			for(int j = 0; j < W; ++j){
				scanf("%d", &maze[i][j]);
			}
		}
		int ans = 0;
		for(int i = 0; i < H; ++i){
			for(int j = 0; j < W; ++j){
				if(maze[i][j] == 1 && !visited[i][j]){
					ans++;
					dfs(j, i);
				}
			}
		}
		cout << ans << endl;
	}
	return 0;
}

C++: #include <bits/stdc++.h>

using namespace std;

int w, h;
int graph[50][50];
int dx[] = {-1, 0, 1, 1, 1, 0, -1, -1};
int dy[] = {-1, -1, -1, 0, 1, 1, 1, 0};

void solve(int y, int x) {
    graph[y][x] = 0;
    for(int i = 0; i < 8; ++i) {
        int ny = y + dy[i];
        int nx = x + dx[i];
        if(ny >= 0 && ny < h && nx >= 0 && nx < w && graph[ny][nx]) {
            solve(ny, nx);
        }
    }
}

int main() {

    while(cin >> w >> h, w | h) {

        int cnt = 0;

        for(int i = 0; i < h; ++i) {
            for(int j = 0; j < w; ++j) {
                cin >> graph[i][j];
            }
        }

        for(int i = 0; i < h; ++i) {
            for(int j = 0; j < w; ++j) {
                if(graph[i][j]) {
                    solve(i, j);
                    ++cnt;
                }
            }
        }

        cout << cnt << endl;

    }

}

C++: #include<iostream>
using namespace std;
void kazoe(int p,int P, int box[50][50]){
  if(box[p][P+1]==1){
    box[p][P+1]=0;
    P=P+1;
    kazoe(p,P,box);
  }
  if(box[p+1][P+1]==1){
    box[p+1][P+1]=0;
    P=P+1;
    p=p+1;
 kazoe(p,P,box);
  }
  if(box[p+1][P]==1){
    box[p+1][P]=0;
    p=p+1;
 kazoe(p,P,box);
  }
  if(box[p+1][P-1]==1){
    box[p+1][P-1]=0;
    P=P-1;
    p=p+1;
 kazoe(p,P,box);
  }
  if(box[p][P-1]==1){
    box[p][P-1]=0;
    P=P-1;
 kazoe(p,P,box);
  }
  if(box[p-1][P-1]==1){
    box[p-1][P-1]=0;
    P=P-1;
    p=p-1;
 kazoe(p,P,box);
  }
  if(box[p-1][P]==1){
    box[p-1][P]=0;
    p=p-1;
 kazoe(p,P,box);
  }
  if(box[p-1][P+1]==1){
    box[p-1][P+1]=0;
    P=P+1;
    p=p-1;
 kazoe(p,P,box);
  }
}
int main(){
  int w,h,i,I,p,P,a=0;
  int box[50][50];
  while(1){
    cin>>w>>h;
    if(w==0&&h==0) break;
    for(i=0;i<h;i++){
      for(I=0;I<w;I++){
	cin>>box[i][I];
      }
    }
    for(i=0;i<h;i++){
      for(I=0;I<w;I++){
	if(box[i][I]==1){
	  p=i;
	  P=I;
	  box[p][P]=0;
	  kazoe(p,P,box);
	  box[i][I]=1;
	}
      }
    }
    for(i=0;i<h;i++){
      for(I=0;I<w;I++){
	if(box[i][I]==1) a++;
      }
    }
  
    cout<<a<<endl;
    a=0;
  }
  return 0;
}

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

int main(){
  bool map[52][52];
  int w,h;

  while(cin >> w >> h && w>0 && h>0){
    for(int i=0;i<52;i++){
      for(int j=0;j<52;j++)
        map[i][j]=false;
    }

    int land=0;

    for(int i=1;i<=h;i++){
      for(int j=1;j<=w;j++){
        int c;
        cin >> c;
        if(c==1){
          map[i][j]=true;
          land++;
        }
      }
    }

    int visited=0,cnt=0;
    queue<int> cur;
    int d[8]={-w-3,-w-2,-w-1,-1,1,w+1,w+2,w+3};

    while(visited<land){
      cnt++;
      for(int i=0;i<(w+2)*(h+2);i++){
        if(map[i/(w+2)][i%(w+2)]){
          map[i/(w+2)][i%(w+2)]=false;
          visited++;
          cur.push(i);
          break;
        }
      }
      while(!cur.empty()){
        for(int i=0;i<8;i++){
          if(map[(cur.front()+d[i])/(w+2)][(cur.front()+d[i])%(w+2)]){
            map[(cur.front()+d[i])/(w+2)][(cur.front()+d[i])%(w+2)]=false;
            visited++;
            cur.push(cur.front()+d[i]);
          }
        }
        cur.pop();
      }
    }

    cout << cnt << endl;
  }

  return 0;
}

C++: #include <iostream>
using namespace std;
int w, h, m[50][50], dx[8] = {-1, 0, 1, -1, 1, -1, 0, 1}, dy[8] = {-1, -1, -1, 0, 0, 1, 1, 1};
void dfs(int x, int y)
{
	int i, nx, ny;
	m[y][x] = 0;
	for (i = 0; i < 8; i++)
	{
		if (0 <= (nx = x+dx[i]) && nx <= w && 0 <= (ny = y+dy[i]) && ny <= h)
			if (m[ny][nx])
				dfs(nx, ny);
	}
}
int main()
{
	int n, i, j;
	while (cin >> w >> h)
	{
		if (w == 0 && h == 0) break;
		for (i = 0; i < h; i++)
			for (j = 0; j < w; j++)
				cin >> m[i][j];
		for (i = n = 0; i < h; i++)
			for (j = 0; j < w; j++)
				if (m[i][j])
					n++, dfs(j, i);
		cout << n << endl;
	}
}

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

int w, h;
int land[51][51];

void dfs(int x, int y) {
  land[x][y] = 2;
  int dx[8] = {1,1,1,0,0,-1,-1,-1};
  int dy[8] = {1,0,-1,1,-1,1,0,-1};
  for (int i = 0; i < 8; i++) {
    int nx = x + dx[i];
    int ny = y + dy[i];
    if (0 <= nx && nx < w && 0 <= ny && ny < h && land[nx][ny] == 1) dfs(nx, ny);
  }
  return;
}

int main() {
  bool jud = true;
  while (jud) {
  cin >> h >> w;
  if (h == 0 && w == 0) {
    jud == false;
    break;
  }
  if (jud == false) break;
  for (int a = 0; a < w; a++) {
    for (int b = 0; b < h; b++) {
      cin >> land[a][b];
    }
  }
  int ans = 0;
  for (int a = 0; a < w; a++) {
    for (int b = 0; b < h; b++) {
      if (land[a][b] == 1) {
        dfs(a, b);
        ans++;
      }
    }
  }
  cout << ans << endl;
  }
}