Go: package main

import (
        "fmt"
)

var paper [10][10]int

func main() {
        var x, y, s int
        for {
                _, err := fmt.Scanf("%d,%d,%d", &x, &y, &s)
                if err != nil {
                        break
                }

                fill(x, y, s)
        }
        var d, z int
        for i := 0; i < 10; i++ {
                for j := 0; j < 10; j++ {
                        if paper[i][j] == 0 {
                                z += 1
                        }
                        if paper[i][j] > d {
                                d += 1
                        }
                }
        }
        fmt.Printf("%d\n%d\n", z, d)
}

func fill(x int, y int, s int) {
        paper[x][y] += 1
        if x > 0 {
                paper[x-1][y] += 1
        }
        if x < 9 {
                paper[x+1][y] += 1
        }
        if y > 0 {
                paper[x][y-1] += 1
        }
        if y < 9 {
                paper[x][y+1] += 1
        }

        if s >= 2 {
                if x > 0 && y > 0 {
                        paper[x-1][y-1] += 1
                }
                if x > 0 && y < 9 {
                        paper[x-1][y+1] += 1
                }
                if x < 9 && y > 0 {
                        paper[x+1][y-1] += 1
                }
                if x < 9 && y < 9 {
                        paper[x+1][y+1] += 1
                }
        }

        if s > 2 {
                if x > 1 {
                        paper[x-2][y] += 1
                }
                if x < 8 {
                        paper[x+2][y] += 1
                }
                if y > 1 {
                        paper[x][y-2] += 1
                }
                if y < 8 {
                        paper[x][y+2] += 1
                }
        }
}

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

class DrawAreaStrategy
{
public:
	DrawAreaStrategy(){}
	virtual ~DrawAreaStrategy(){}

	DrawAreaStrategy(const DrawAreaStrategy&) = delete;
	DrawAreaStrategy& operator=(const DrawAreaStrategy&) = delete;

	DrawAreaStrategy(DrawAreaStrategy&&) = delete;
	DrawAreaStrategy& operator=(DrawAreaStrategy&&) = delete;

	virtual void Draw(std::vector<std::vector<int>>& draw_sheet, int x, int y) = 0;
};

class DrawAreaSmallStrategy
{
public:
	DrawAreaSmallStrategy() {}
	virtual ~DrawAreaSmallStrategy() {}

	DrawAreaSmallStrategy(const DrawAreaSmallStrategy&) = delete;
	DrawAreaSmallStrategy& operator=(const DrawAreaSmallStrategy&) = delete;

	DrawAreaSmallStrategy(DrawAreaSmallStrategy&&) = delete;
	DrawAreaSmallStrategy& operator=(DrawAreaSmallStrategy&&) = delete;

	virtual void Draw(std::vector<std::vector<int>>& draw_sheet, int x, int y)
	{
		static const std::vector<std::pair<int, int>> draw_list
		{
			{ 0,  0 },

			{ -1,  0 },
			{  1,  0 },
			{  0, -1 },
			{  0,  1 }
		};
		for (auto draw_point : draw_list)
		{
			int draw_x = draw_point.first + x;
			if (draw_x < 0 || draw_x >= 10){ return; }

			int draw_y = draw_point.first + y;
			if (draw_y < 0 || draw_y >= 10) { return; }

			draw_sheet[x + draw_point.first][y + draw_point.second]++;
		}
	}
};


class DrawAreaMiddleStrategy
{
public:
	DrawAreaMiddleStrategy() {}
	virtual ~DrawAreaMiddleStrategy() {}

	DrawAreaMiddleStrategy(const DrawAreaMiddleStrategy&) = delete;
	DrawAreaMiddleStrategy& operator=(const DrawAreaMiddleStrategy&) = delete;

	DrawAreaMiddleStrategy(DrawAreaMiddleStrategy&&) = delete;
	DrawAreaMiddleStrategy& operator=(DrawAreaMiddleStrategy&&) = delete;

	virtual void Draw(std::vector<std::vector<int>>& draw_sheet, int x, int y)
	{
		static const std::vector<std::pair<int, int>> draw_list
		{
			{ 0,  0 },

			{ -1,  0 },
			{ 1,  0 },
			{ 0, -1 },
			{ 0,  1 },

			{ -1, -1 },
			{ -1,  1 },
			{  1, -1 },
			{  1,  1 }
		};
		for (auto draw_point : draw_list)
		{
			int draw_x = draw_point.first + x;
			if (draw_x < 0 || draw_x >= 10) { return; }

			int draw_y = draw_point.first + y;
			if (draw_y < 0 || draw_y >= 10) { return; }

			draw_sheet[x + draw_point.first][y + draw_point.second]++;
		}
	}
};

class DrawAreaLargeStrategy
{
public:
	DrawAreaLargeStrategy() {}
	virtual ~DrawAreaLargeStrategy() {}

	DrawAreaLargeStrategy(const DrawAreaLargeStrategy&) = delete;
	DrawAreaLargeStrategy& operator=(const DrawAreaLargeStrategy&) = delete;

	DrawAreaLargeStrategy(DrawAreaLargeStrategy&&) = delete;
	DrawAreaLargeStrategy& operator=(DrawAreaLargeStrategy&&) = delete;

	virtual void Draw(std::vector<std::vector<int>>& draw_sheet, int x, int y)
	{
		static const std::vector<std::pair<int, int>> draw_list
		{
			{  0,  0 },

			{ -1,  0 },
			{  1,  0 },
			{  0, -1 },
			{  0,  1 },

			{ -1, -1 },
			{ -1,  1 },
			{  1, -1 },
			{  1,  1 },

			{ -2,  0 },
			{  2,  0 },
			{  0, -2 },
			{  0,  2 }
		};
		for (auto draw_point : draw_list)
		{
			int draw_x = draw_point.first + x;
			if (draw_x < 0 || draw_x >= 10) { return; }

			int draw_y = draw_point.first + y;
			if (draw_y < 0 || draw_y >= 10) { return; }

			draw_sheet[x + draw_point.first][y + draw_point.second]++;
		}
	}
};

int main()
{
	DrawAreaSmallStrategy small;
	DrawAreaMiddleStrategy middle;
	DrawAreaLargeStrategy large;

	std::vector< std::vector<int> > sheet(10, std::vector<int>(10));

	int x = 0, y = 0, s = 0;
	char a = 0;
	while (std::cin >> x >> a >> y >> a >> s)
	{
		switch (s)
		{
		case 1:
		{
			small.Draw(sheet, x, y);
			break;
		}
		case 2:
		{
			middle.Draw(sheet, x, y);
			break;
		}
		case 3:
		{
			large.Draw(sheet, x, y);
			break;
		}
		default:
			break;
		}
	}

	int empty_num = 0;
	int max_num = 0;

	for (auto line : sheet)
	{
		for (auto cell : line)
		{
			if (0 == cell)
			{
				empty_num++;
				continue;
			}
			if (max_num < cell)
			{
				max_num = cell;
			}
		}
	}
	std::cout << empty_num << "\n" << max_num << std::endl;

	return 0;
}

C++: #include<iostream>
using namespace std;
int main(){
  int k[10][10]={0};
  int x,y,s,i,j;
  char c;
  int d=0,w=0;
  int S[4]={0,5,9,13};
  int X[]={0,1,-1,0,0,1,-1,1,-1,2,-2,0,0};
  int Y[]={0,0,0,1,-1,1,-1,-1,1,0,0,2,-2};
  while(cin>>x>>c>>y>>c>>s){
    for(i=0;i<S[s];i++){
      
      if(-1<x&&x<10&&-1<y&&y<10){
	if(-1<x+X[i]&&x+X[i]<10&&-1<y+Y[i]&&y+Y[i]<10){
	  k[x+X[i]][y+Y[i]]++;
	  if(k[x+X[i]][y+Y[i]]>d){
	    d=k[x+X[i]][y+Y[i]];
	  }
	}
      }
    }
  }
  for(i=0;i<10;i++){
    for(j=0;j<10;j++){
      if(k[i][j]==0)w++;
    }
  }
  if(d!=0){
    cout<<w<<"\n"<<d<<endl;
  }
  return 0;
}

C++: #include <cstdio>
#include <iostream>
#include <string>
#include <complex>
using namespace std;

#define REP(i, n)       REPEAT(i, 0, n)
#define REPEAT(i, k, n) for (int i = (k); i < (n); ++i)
#define MAX(p1,p2)      (((p1)>(p2))?(p1):(p2))
typedef double D;
typedef complex<D>P;

const int MAX_X = 10;
const int MAX_Y = 10;
int m[MAX_Y+1][MAX_X+1];

int main(){
    string s;
    while(getline(cin, s)){
        int x, y, sz;
        sscanf(s.c_str(), "%d,%d,%d", &x, &y, &sz);
        P p1(x,y);
        double r = (sz + 1.0) / 2; r = r*r;
        REPEAT(ny, -2, 3){
            int y2 = y + ny; if(y2 < 0 || y2 >= MAX_Y) continue;
            REPEAT(nx, -2, 3){
                int x2 = x + nx; if(x2 < 0 || x2 >= MAX_X) continue;
                P p2(x2, y2);
                if(norm(p1-p2) <= r) m[y2][x2]++;
            }
        }
    }
    int zeronum = 0, max = -1;
    REP(y,MAX_Y) REP(x,MAX_X){
        if(m[y][x] == 0) zeronum++;
        max = MAX(max, m[y][x]);
    }
    cout << zeronum << endl << max << endl;
    return 0;
}