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>
using namespace std;

int main(){
  int x,y,size;
  int canvas[10][10];
  int empty_num, max_val;
  int i, j;

  for(i=0; i<10; i++)
    for(j=0; j<10; j++) canvas[i][j]=0;
  while(cin>>x){
    cin>>y; cin>>size;

    for(i=-1; i<=1; i=i+2)
      if(x+i>=0 && x+i<10) canvas[x+i][y]++;
    for(i=-1; i<=1; i=i+2)
      if(y+i>=0 && y+i<10) canvas[x][y+i]++;
    if(size>1){
      for(i=-1; i<=1; i=i+2){
        for(j=-1; j<=1; j=j+2)
          if(x+i>=0 && x+i<10 && y+j>=0 && y+j<10) canvas[x+i][y+j]++;
      }
    }
    if(size>2){
      for(i=-2; i<=2; i=i+4)
        if(x+i>=0 && x+i<10) canvas[x+i][y]++;
      for(i=-2; i<=2; i=i+4)
        if(y+i>=0 && y+i<10) canvas[x][y+i]++;
    }

    empty_num=0; max_val=0;
    for(i=0; i<10; i++){
      for(j=0; j<10; j++){
        if(canvas[i][j]>max_val) max_val=canvas[i][j];
        else if(canvas[i][j]==0) empty_num++;
      }
    }

    printf("%d\n%d\n", empty_num, max_val);
  }
  return 0;
}

C++: //インクを落とす
#include<cstdio>

using namespace std;

int main(void){
	int pa[14][14];
	int i,j;	//ループカウンタ
	int x,y,size,da=0,not=0;
	
	//二次元配列の初期化
	for(i=0;i<14;i++){
		for(j=0;j<14;j++)
			pa[i][j]=0;
	}

	while(scanf("%d,%d,%d",&x,&y,&size)!=EOF){
		x=x+2;
		y=y+2;
		switch(size){
			case 1:	//小
				pa[y][x]++;
				pa[y-1][x]++;
				pa[y+1][x]++;
				pa[y][x-1]++;
				pa[y][x+1]++;
				break;
			case 2:	//中
				for(i=-1;i<=1;i++){
					for(j=-1;j<=1;j++)
						pa[y+i][x+j]++;
				}
				break;
			case 3:	//大
				for(i=-1;i<=1;i++){
					for(j=-1;j<=1;j++)
						pa[y+i][x+j]++;
				}
				pa[y-2][x]++;
				pa[y+2][x]++;
				pa[y][x-2]++;
				pa[y][x+2]++;
				break;
		}
	}
	for(i=2;i<12;i++){
		for(j=2;j<12;j++){
			if(pa[i][j]==0)
				not++;
		}
	}
	for(i=2;i<12;i++){
		for(j=2;j<12;j++){
			if(pa[i][j]>da)
				da=pa[i][j];
		}
	}
	printf("%d\n%d\n",not,da);

	return 0;
}

C++: #include<iostream>
#include<vector>
#include<stdio.h>
int main(){
	int x,y,size;
	std::vector<std::vector<int> > vec(10,std::vector<int>(10,0));
	while(scanf("%d,%d,%d",&x,&y,&size)!=EOF){
		vec[y][x]++;
		vec[y-1][x]++;
		vec[y+1][x]++;
		vec[y][x-1]++;
		vec[y][x+1]++;
		if(size>=2){
			vec[y-1][x-1]++;
			vec[y-1][x+1]++;
			vec[y+1][x-1]++;
			vec[y+1][x+1]++;
		}
		if(size==3){
			vec[y-2][x]++;
			vec[y+2][x]++;
			vec[y][x-2]++;
			vec[y][x+2]++;
		}
	}
	int no=0,max=0;
	for(int i=0;i<10;i++){
		for(int j=0;j<10;j++){
			if(vec[i][j]==0)no++;
			if(vec[i][j]>max)max=vec[i][j];
		}
	}
	std::cout<<no<<std::endl;
	std::cout<<max<<std::endl;
	return 0;
}

C++: #include <iostream>

using namespace std;

int main()
{
	int paper[10][10] = {0};
	int x,y,s;
	char dummy;
	
	while ( cin >> x >> dummy >> y >> dummy >> s ) {
		switch (s) {
		case 1:
			paper[x][y]++;
			if (x>0) paper[x-1][y]++;
			if (x<9) paper[x+1][y]++;
			if (y>0) paper[x][y-1]++;
			if (y<9) paper[x][y+1]++;
			break;
		case 2:
			paper[x][y]++;
			if (x>0) {
				paper[x-1][y]++;
				if (y>0) paper[x-1][y-1]++;
				if (y<9) paper[x-1][y+1]++;
			}
			if (x<9) {
				paper[x+1][y]++;
				if (y>0) paper[x+1][y-1]++;
				if (y<9) paper[x+1][y+1]++;
			}
			if (y>0) paper[x][y-1]++;
			if (y<9) paper[x][y+1]++;
			break;
		case 3:
			if (x>1) paper[x-2][y]++;
			if (x<8) paper[x+2][y]++;
			if (y>1) paper[x][y-2]++;
			if (y<8) paper[x][y+2]++;
			paper[x][y]++;
			if (x>0) {
				paper[x-1][y]++;
				if (y>0) paper[x-1][y-1]++;
				if (y<9) paper[x-1][y+1]++;
			}
			if (x<9) {
				paper[x+1][y]++;
				if (y>0) paper[x+1][y-1]++;
				if (y<9) paper[x+1][y+1]++;
			}
			if (y>0) paper[x][y-1]++;
			if (y<9) paper[x][y+1]++;
			break;
		}
	}
	
	int zerocnt = 0;
	int maxdens = 0;
	for (int i=0; i<10; i++) {
		for (int j=0; j<10; j++) {
			if (paper[i][j]==0) zerocnt++;
			if (maxdens < paper[i][j]) maxdens = paper[i][j];
		}
	}
	
	cout << zerocnt << endl << maxdens << endl;
	
	return 0;
}