Go: package main

import (
	"bufio"
	"os"
	"strings"
	"strconv"
	"fmt"
)

func rangeCheck(x, y int) bool {
	if x >= 0 && x <= 9 && y >= 0 && y <= 9 {
		return true
	} else {
		return false
	}
}

func main() {
	scanner := bufio.NewScanner(os.Stdin)
	paper := make([][]int, 10)
	for i := range paper {
		paper[i] = make([]int, 10)
		for j := range paper[i] {
			paper[i][j] = 0
		}
	}
	fmt.Println(paper)
	for scanner.Scan() {
		infos := strings.Split(scanner.Text(), ",")
		x, _ := strconv.Atoi(infos[0])
		y, _ := strconv.Atoi(infos[1])
		s, _ := strconv.Atoi(infos[2])
		// fmt.Println(x, y, s)
		switch s {
		case 1:
			paper[x][y]++
			if rangeCheck(x, y-1) {
				paper[x][y-1]++
			}
			if rangeCheck(x, y+1) {
				paper[x][y+1]++
			}
			if rangeCheck(x-1, y) {
				paper[x-1][y]++
			}
			if rangeCheck(x+1, y) {
				paper[x+1][y]++
			}
			continue
		case 2:
			paper[x][y]++
			if rangeCheck(x-1, y-1) {
				paper[x-1][y-1]++
			}
			if rangeCheck(x, y-1) {
				paper[x][y-1]++
			}
			if rangeCheck(x+1, y-1) {
				paper[x+1][y-1]++
			}
			if rangeCheck(x-1, y) {
				paper[x-1][y]++
			}
			if rangeCheck(x+1, y) {
				paper[x+1][y]++
			}
			if rangeCheck(x-1, y+1) {
				paper[x-1][y+1]++
			}
			if rangeCheck(x, y+1) {
				paper[x][y+1]++
			}
			if rangeCheck(x+1, y+1) {
				paper[x+1][y+1]++
			}
			continue
		case 3:
			paper[x][y]++
			if rangeCheck(x-1,y-1) {
				paper[x-1][y-1]++
			}
			if rangeCheck(x,y-1) {
				paper[x][y-1]++
			}
			if rangeCheck(x+1,y-1) {
				paper[x+1][y-1]++
			}
			if rangeCheck(x-1,y) {
				paper[x-1][y]++
			}
			if rangeCheck(x+1,y) {
				paper[x+1][y]++
			}
			if rangeCheck(x-1,y+1) {
				paper[x-1][y+1]++
			}
			if rangeCheck(x,y+1) {
				paper[x][y+1]++
			}
			if rangeCheck(x+1,y+1) {
				paper[x+1][y+1]++
			}
			if rangeCheck(x,y-2) {
				paper[x][y-2]++
			}
			if rangeCheck(x-2,y) {
				paper[x-2][y]++
			}
			if rangeCheck(x+2,y) {
				paper[x+2][y]++
			}
			if rangeCheck(x,y+2) {
				paper[x][y+2]++
			}
			continue
		}
	}
	count := 0
	max := -1
	for i := range paper {
		for j := range paper[i] {
			if paper[i][j] == 0 {
				count++
			}
			if max >= paper[i][j] {
				max = max
			} else {
				max = paper[i][j]
			}
		}
	}
	fmt.Printf("%d\n%d", count, max)
}

C++: #include <iostream>
#include <algorithm>
#include <vector>
#include <cstdio>
#include <string>
#include <set>
#include <map>
#include <queue>
#include <stack>
#include <cmath>
#include <functional>
#include <numeric>
#include <iomanip>
#define fi first
#define se second
#define fcout(n) cout<<fixed<<setprecision((n))
#define cinl(str) getline(cin,(str))
using namespace std;
bool value(int y,int x,int R,int C){return 0<=y&&y<R&&0<=x&&x<C;}
typedef pair<int,int> pii;
typedef long long ll;
typedef vector<int> vi;
typedef vector<long long > vll;
typedef vector< vi > vvi;
double pie=acos(-1);
int INF=10000009;
int dx[4] = { 0,-1,0,1 };
int dy[4] = { -1,0,1,0 };
int dx2[4] = { 0,-2,0,2 };
int dy2[4] = { -2,0,2,0 };
int m[15][15];
int main() {
	int x[10000],y[10000],z[10000];
	char s,t;
	int count=0,M=0;
	int n=0;
	while(true){
		cin>>x[n]>>s>>y[n]>>t>>z[n];
		if (cin.eof())break;
		n++;
	}
	for(int i=0;i<=n;i++){
		if(z[i]==1){
			m[y[i]][x[i]]++;
			for(int j=0;j<4;j++){
				if(value(y[i]+dy[j],x[i]+dx[j],10,10)){
					m[y[i]+dy[j]][x[i]+dx[j]]++;
				}
			}
		}
		else if(z[i]==2){
			for(int j=-1;j<=1;j++){
				for(int k=-1;k<=1;k++){
					if(value(y[i]+k,x[i]+j,10,10)){
						m[y[i]+k][x[i]+j]++;
					}
				}
			}
		}
		else{
			for(int j=-1;j<=1;j++){
				for(int k=-1;k<=1;k++){
					if(value(y[i]+k,x[i]+j,10,10)){
						m[y[i]+k][x[i]+j]++;
					}
				}
			}
			for(int j=0;j<4;j++){
				if(value(y[i]+dy2[j],x[i]+dx2[j],10,10)){
					m[y[i]+dy2[j]][x[i]+dx2[j]]++;
				}
			}
		}
	}
	for(int i=0;i<=9;i++){
		for(int j=0;j<=9;j++){
			if(m[i][j]==0) count++;
			if(m[i][j]>M) M=m[i][j];
		}
	}
	cout<<count<<endl;
	cout<<M<<endl;
}

C++: #include <bits/stdc++.h>
using namespace std;
int cnt[10][10];
int sx[]={-1,0,0,0,1},mx[]={-1,-1,-1,0,0,0,1,1,1},lx[]={-2,-1,-1,-1,0,0,0,0,0,1,1,1,2};
int sy[]={0,1,0,-1,0},my[]={1,0,-1,1,0,-1,1,0,-1},ly[]={0,1,0,-1,2,1,0,-1,-2,1,0,-1,0};
int main(){
	memset(cnt,0,sizeof(cnt));
	int x,y,s;
	while(scanf("%d,%d,%d",&x,&y,&s)!=EOF){
		switch(s){
			case 1:
				for(int i=0;i<5;i++){
					cnt[y+sy[i]][x+sx[i]]++;
				}
				break;
			case 2:
				for(int i=0;i<9;i++){
					cnt[y+my[i]][x+mx[i]]++;
				}
				break;
			case 3:
				for(int i=0;i<13;i++){
					cnt[y+ly[i]][x+lx[i]]++;
				}
				break;
			case -1:
				goto end;
		}
	}
	end:;
	int big=0,blank=0;
	for(int i=0;i<10;i++){
		for(int j=0;j<10;j++){
			if(cnt[i][j]==0)	blank++;
			big=max(big,cnt[i][j]);
		}
	}
	cout<<blank<<endl;
	cout<<big<<endl;
	return 0;
}

C++: // compile in C++11. use -std=c++11.
#include <iostream>
#include <iomanip>
#include <vector>
#include <valarray>
#include <map>
#include <set>
#include <list>
#include <queue>
#include <stack>
#include <bitset>
#include <utility>
#include <numeric>
#include <algorithm>
#include <functional>
#include <complex>
#include <string>
#include <sstream>

#include <cstdio>
#include <cstdlib>
#include <cctype>
#include <cstring>

// this require C++11
#include <unordered_set>
#include <unordered_map>
#include <random>

using namespace std;

#define all(c) c.begin(),c.end()
#define repeat(i,n) for(int i=0;i<static_cast<int>(n);i++)
#define debug(x) #x << "=" << (x)
#define dump(x) cerr << debug(x) << " (L:" << __LINE__ << ")"<< endl

typedef long long ll;
typedef vector<int> vi;

template<typename T>
ostream& operator<<(ostream& os,const vector<T>& vec){
    os << "[";
    for(const auto& v : vec){
        os << v << ",";
    }
    os << "]";
    return os;
}

template<typename T>
T input(){
    T t;cin >> t;
    return t;
}

template<typename T>
vector<T> input(const int N){
    vector<T> v(N);
    repeat(i,N) cin >> v[i];
    return v;
}

int main(){
    const int FIELD_SIZE = 10;
    const int PADDING = 2;
    const int DATA_SIZE = FIELD_SIZE + 2*PADDING;
    vector<vi> field(DATA_SIZE,vi(DATA_SIZE));
    {
        int y,x,size;char comma;
        while(cin >> x >> comma >> y >> comma >> size){
            x += PADDING;
            y += PADDING;

            field[y][x] += 1;
            vi dx,dy;
            if(size == 1){
                dx = {1,0,-1,0};
                dy = {0,-1,0,1};
            }else{
                for(int i=-1;i<=1;i++){
                    for(int j=-1;j<=1;j++){
                        if(i == 0 and j == 0) continue;
                        dx.push_back(i);
                        dy.push_back(j);
                    }
                }
                if(size == 3){
                    vi ax = {2,0,-2,0};
                    vi ay = {0,-2,0,2};
                    repeat(i,4){
                        dx.push_back(ax[i]);
                        dy.push_back(ay[i]);
                    }
                }
            }
            dump(dx);
            dump(dy);
            repeat(i,dx.size()){
                field[y+dy[i]][x+dx[i]]++;
            }
        }
    }

    int maxi = -1;
    int no = 0;

    for(int y=PADDING;y<FIELD_SIZE+PADDING;y++){
        for(int x=PADDING;x<FIELD_SIZE+PADDING;x++){
            cerr << field[y][x];
            maxi = max(maxi,field[y][x]);
            no += field[y][x]==0;
        }
        cerr << endl;
    }

    cout << no << endl << maxi << endl;

    return 0;
}