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 <bits/stdc++.h>
using namespace std;

constexpr int N = 10;

void drop( int p[N][N], int x, int y, int s ) {
	static const vector<vector<int>> ink = {
		{ 0,-1, -1,0, 0,0, 1,0, 0,1 },
		{ -1,-1, 0,-1, 1,-1, -1,0, 0,0, 1,0, -1,1, 0,1, 1,1 },
		{ 0,-2, -1,-1, 0,-1, 1,-1, -2,0, -1,0, 0,0, 1,0, 2,0, -1,1, 0,1, 1,1, 0,2 }
	};

	auto& v = ink[s-1];
	for( int i = 0; i < v.size()/2; ++i ) {
		uint32_t a = y + v[2*i + 1];
		uint32_t b = x + v[2*i];

		if( a < N && b < N ) {
			p[a][b] += 1;
		}
	}
}

int main() {
	ios_base::sync_with_stdio( false );

	int paper[N][N] = {};

	int x, y, s;
	char c;
	while( cin >> x >> c >> y >> c >> s ) {
		drop( paper, x, y, s );
	}

	int w = 0;
	int d = 0;

	for( int i = 0; i < N; ++i ) {
		for( int j = 0; j < N; ++j ) {
			if( paper[i][j] == 0 ) {
				w += 1;
			}
			else if( paper[i][j] > d ) {
				d = paper[i][j];
			}
		}
	}

	cout << w << '\n' << d << '\n';
}

C++: #include <iostream>
#include <stdio.h>
#include <sstream>
using namespace std;
void draw(int map[10][10]);
void drop(int x,int y,int z);
void drop_rotate(int,int,int,int);
bool isValidPoint(int,int);
void count(int map[10][10]);
int map[10][10];
int white, conc;
int dx,dy;

int main(){
  int x,y,s;
  string tmp;
  
  //zñÌú»
  for(int i=0;i<10;i++){
    for(int j=0;j<10;j++){
      map[i][j]=0;
    }
  }

  while(cin >> tmp){ //J}æØèðooÉ
    tmp.replace(tmp.find(","),1," ");
    tmp.replace(tmp.find(","),1," ");
    istringstream ss(tmp);
    ss >> x >> y >> s;
    drop(x,y,s);
    //draw(map);
  }
  count(map);
}

//2³mapÌ`Ê
void draw(int map[10][10]){
    for(int i=0;i<10;i++){
      for(int j=0;j<10;j++){
      printf("%4d",map[i][j]);
      }
      cout << endl;
    }
    cout << endl;
}

//¦ðÔ·Ö
void count(int map[10][10]){
  white = 0; conc = 0;
  for(int i=0;i<10;i++){
    for(int j=0;j<10;j++){
      if(map[i][j]==0){
	white++;
      }
      if(map[i][j] > conc){
	conc = map[i][j];
      }
    }
  }
  cout << white << endl << conc << endl;
}
 
//CNº
void drop(int x,int y,int s){
  if(isValidPoint(x,y)){
    map[x][y]++;
  }
  if(s==3){
    drop_rotate(x,y,2,0);
    drop_rotate(x,y,1,1);
    drop_rotate(x,y,1,0);
  }else if(s==2){
    drop_rotate(x,y,1,1); 
    drop_rotate(x,y,1,0);
  }else{
    drop_rotate(x,y,1,0);
  }
}

void drop_rotate(int x, int y,int dx, int dy){
  int temp;
  for(int i = 0; i < 4; i++){
    temp = dx;
    dx = dy;
    dy = -temp;
    if(isValidPoint((x+dx),(y+dy))){
      map[x+dx][y+dy]++;
    }
  }
}

bool isValidPoint(int x,int y){
  if(x < 0 || x > 9 || y < 0 || y > 9){
    return false;
  }else{
    return true;
  }
}

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

int board[10][10];
int empty = 0;
int _max = 0;

bool ok(int val) {
    return(val >= 0 && val < 10);
}

void small(int x, int y) {
    board[y][x]++;
    int north = y - 1, south = y + 1,  east = x + 1, west = x - 1;
    if(ok(north)) board[north][x]++;
    if(ok(south)) board[south][x]++;
    if(ok(east))  board[y][east]++;
    if(ok(west))  board[y][west]++;
}

void mid(int x, int y) {
    small(x, y);
    int uprightx = x + 1, uprighty = y + 1;
    int downrightx = x + 1, downrighty = y - 1;
    int downleftx = x - 1, downlefty = y - 1;
    int upleftx = x - 1, uplefty = y + 1;
    if(ok(uprightx) && ok(uprighty)) board[uprighty][uprightx]++;
    if(ok(downrightx) && ok(downrighty)) board[downrighty][downrightx]++;
    if(ok(downleftx) && ok(downlefty)) board[downrighty][downrightx]++;
    if(ok(upleftx) && ok(uplefty)) board[uplefty][upleftx]++;
}

void large(int x, int y) {
    mid(x, y);
    int north = y - 2, south = y + 2,  east = x + 2, west = x - 2;
    if(ok(north)) board[north][x]++;
    if(ok(south)) board[south][x]++;
    if(ok(east))  board[y][east]++;
    if(ok(west))  board[y][west]++;
}

void search() {
    for(int r = 0; r < 10; r++) {
        for(int c = 0; c < 10; c++) {
            if(board[r][c] > _max) _max = board[r][c];
            if(board[r][c] == 0) empty++;
        }
    }
}

int main(void) {
    int x, y, size;
    
    while(scanf("%d,%d,%d", &x, &y, &size) != EOF) {
        switch(size) {
            case 1: small(x, y); break;
            case 2: mid(x, y);   break;
            default:large(x, y); break;
        }
    }
    search();
    cout << empty << endl << _max << endl;
    return(0);
}