life game implementation

#include "stdafx.h"
#include <iostream>
#include <string>
#include <cstdio>
 
using namespace std;
 
int board[100][100];
int tmpboard[100][100];
 
int check(int x, int y) {
    if (x == 0 || y == 0 || x == 99 || y == 99) {
        return 0;
    }
    int count = 0;
    for (int i = -1; i <= 1; i++) {
        for (int j = -1; j <= 1; j++) {
            if (!(x==0&&y==0) && board[x + i][y + j] == 1) {
                count++;
            }
        }
    }
    if (count == 2) {
        return -1;
    }
    else if (count == 3) {
        return 1;
    }
    else {
        return 0;
    }
}
 
void reconstruct() {
    for (int i = 0; i < 100; i++) {
        for (int j = 0; j < 100; j++) {
            int M = check(i, j);
            if (M == 0) {
                tmpboard[i][j] = 0;
            }
            else if(M==1) {
                tmpboard[i][j] = 1;
            }
            else {
                tmpboard[i][j] = (board[i][j] == 1) ? 0 : 1;
            }
        }
    }
    for (int i = 0; i < 100; i++) {
        for (int j = 0; j < 100; j++) {
            board[i][j] = tmpboard[i][j];
        }
    }
}
 
int main() {
    for (int i = 0; i < 100; i++) {
        for (int j = 0; j < 100; j++) {
            board[i][j] = 0;
        }
    }
    board[50][50] = 1;
    board[49][50] = 1;
    board[51][50] = 1;
    board[50][49] = 1;
    board[50][51] = 1;
    for (int k = 0; k < 100; k++) {
        reconstruct();
        for (int i = 0; i < 100; i++) {
            for (int j = 0; j < 100; j++) {
                printf("%d", board[i][j]);
            }
            printf("\n");
        }
        printf("----\n");
    }
}