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<stdlib.h>
using namespace std;

int paper[10][10] = { 0 };

void drop_ink(int x,int y,int size) {
	if (size == 1) {
		for (int i = 0; i < 3; i++) {
			if (x + i - 1 >= 0 && y >= 0) { paper[x + i - 1][y] += 1; }
		}
		for (int i = 0; i < 3; i++) {
			if (x >= 0 && y + i - 1 >= 0) {
				if (y + i - 1 != y) { paper[x][y + i - 1] += 1; }
			}
		}
	}
	else if (size == 2) {
		for (int i = 0; i < 3; i++) {
			if (x + 1 >= 0 && y - 1 + i >= 0) {
				paper[x + 1][y - 1 + i] += 1;
				}
			}
		for (int i = 0; i < 3; i++) {
			if (x >= 0 && y - 1 + i >= 0) {
				paper[x][y - 1 + i] += 1;
				}
			}
		for (int i = 0; i < 3; i++) {
			if (x - 1 >= 0 && y - 1 + i >= 0) {
				paper[x - 1][y - 1 + i] += 1;
				}
			}
	}
	else if (size == 3) {
		for (int i = 0; i < 3; i++) {
			if (x + 1 >= 0 && y - 1 + i >= 0) {
				paper[x + 1][y - 1 + i] += 1;
			}
		}
		for (int i = 0; i < 5; i++) {
			if (x >= 0 && y - 2 + i >= 0) {
				paper[x][y - 2 + i] += 1;
			}
		}
		for (int i = 0; i < 3; i++) {
			if (x - 1 >= 0 && y - 1 + i >= 0) {
				paper[x - 1][y - 1 + i] += 1;
			}
		}
		if (x + 2 >= 0 && y >= 0){paper[x + 2][y] += 1;}
		if (x - 2 >= 0 && y >= 0) { paper[x - 2][y] += 1; }
	}
}
int main() {
	char x[1], y[1], size[1]; char tem[5];
	int white = 0; int most_intense=0;
	while(cin>>tem) {
		x[0] = tem[0]; y[0] = tem[2]; size[0] = tem[4];
		drop_ink(atoi(x),atoi(y),atoi(size));
	}
	for (int i = 0; i < 10; i++) {
		for (int j = 0; j < 10; j++) {
			if (paper[j][i] == 0) { white += 1; }
			if (most_intense < paper[j][i]) { most_intense = paper[j][i]; }
		}
	}
	cout << white << endl << most_intense ;
	return 0;
}

C++: #include <algorithm>
#include <cmath>
#include <climits>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <fstream>
#include <iostream>
#include <list>
#include <map>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <vector>
#include <cassert>
#include <functional>

using namespace std;

#define LOG(...) printf(__VA_ARGS__)
//#define LOG(...)
#define FOR(i,a,b) for(int i=(int)(a);i<(int)(b);++i)
#define REP(i,n) for(int i=0;i<(int)(n);++i)
#define ALL(a) (a).begin(),(a).end()
#define RALL(a) (a).rbegin(),(a).rend()
#define EXIST(s,e) ((s).find(e)!=(s).end())
#define SORT(c) sort((c).begin(),(c).end())
#define RSORT(c) sort((c).rbegin(),(c).rend())
#define CLR(a) memset((a), 0 ,sizeof(a))

typedef long long ll;
typedef unsigned long long ull;
typedef vector<bool> vb;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<vb> vvb;
typedef vector<vi> vvi;
typedef vector<vll> vvll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int dx[] = { -1, 0, 1, 0 }; const int dy[] = { 0, 1, 0, -1 };
const int dx2[] = { -1, -1, 1, 1 }; const int dy2[] = { -1, 1, 1, -1 };
int main() {
	char c;
	int cell[10][10]={0};
	int x, y, size;
	while (cin>>x>>c>>y>>c>>size){
		
		switch (size)
		{
		case 3:
			REP(i, 4){
				if (0 <= x + dx[i] * 2 && x + dx[i] * 2 <= 9 && 0 <= y + dy[i] * 2 && y + dy[i] * 2 <= 9)
					cell[x + dx[i] * 2][y + dy[i] * 2]++;
			}
		case 2:
			REP(i, 4){
				if (0 <= x + dx2[i]  && x + dx2[i]  <= 9 && 0 <= y + dy2[i]  && y + dy2[i]  <= 9)
					cell[x + dx2[i] ][y + dy2[i]]++;
			}
		case 1:
			REP(i, 4){
				if (0 <= x + dx[i] && x + dx[i] <= 9 && 0 <= y + dy[i] && y + dy[i] <= 9)
					cell[x + dx[i]][y + dy[i]]++;
			}
			cell[x][y]++;
			break;
		}
	}
	int maxb=0;
	int count=0;
	REP(i,10){
		REP(j,10){
			if(cell[i][j]==0)
			count++;
			maxb=max(maxb,cell[i][j]);
		}
	}
	cout<<count<<endl<<maxb<<endl;
}

C++: #include<iostream>
#include<cstdio>
using namespace std;
int main()
{
	int x,y,size;
	int paper[11][11] = { 0 };

	while(scanf("%d,%d,%d",&x,&y,&size) != EOF){
		switch (size){
			case 1 : 	paper[x][y] += 1;
							paper[x-1][y] += 1;
							paper[x+1][y] += 1;
							paper[x][y-1] += 1;
							paper[x][y+1] += 1;
							break;

			case 2 : 	paper[x][y] += 1;
							paper[x-1][y] += 1;
							paper[x+1][y] += 1;
							paper[x][y-1] += 1;
							paper[x][y+1] += 1;
							paper[x-1][y-1] += 1;
							paper[x-1][y+1] += 1;
							paper[x+1][y-1] += 1;
							paper[x+1][y+1] += 1;
							break;

			case 3 : 	paper[x][y] += 1;
							paper[x-1][y] += 1;
							paper[x+1][y] += 1;
							paper[x][y-1] += 1;
							paper[x][y+1] += 1;
							paper[x-1][y-1] += 1;
							paper[x-1][y+1] += 1;
							paper[x+1][y-1] += 1;
							paper[x+1][y+1] += 1;
							paper[x-2][y] += 1;
							paper[x+2][y] += 1;
							paper[x][y-2] += 1;
							paper[x][y+2] += 1;
							break;
		}
	}
	int zcount = 0;
	int density = 0;

	for(int i = 0;i < 10;i++){
		for(int j = 0;j < 10;j++){
			if(paper[i][j] == 0){
				zcount++;
			}
			if(density < paper[i][j]){
				density = paper[i][j];
			}
		}
	}

	cout << zcount << endl << density << endl;
}