Go: package main

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

func main() {
	io := NewIo()
	defer io.Flush()
	for {
		h := io.NextInt()
		if h == 0 {
			break
		}
		p := make([][]int, h)
		for i := 0; i < h; i++ {
			p[i] = make([]int, 5)
			for j := 0; j < 5; j++ {
				p[i][j] = io.NextInt()
			}
		}
		ans := 0
		for {
			sc := puyo(p, h)
			if sc == 0 {
				break
			}
			fall(p, h)
			ans += sc
		}
		io.Println(ans)
	}
}

func puyo(p [][]int, h int) int {
	sc := 0
	for i := 0; i < h; i++ {
		for j := 0; j < 3; j++ {
			var cnt int
			for cnt = 1; j+cnt < 5; cnt++ {
				if p[i][j] != p[i][j+cnt] {
					break
				}
			}
			if cnt > 2 {
				sc += p[i][j]*cnt
				for k := 0; k < cnt; k++ {
					p[i][j+k] = 0
				}
			}
		}
	}
	return sc
}

func fall(p [][]int, h int) {
	for j := 0; j < 5; j++ {
		for k := 1; k < h; k++ {
			for i := h - 1; i >= k; i-- {
				if p[i][j] == 0 {
					p[i][j] = p[i-1][j]
					p[i-1][j] = 0
				}
			}
		}
	}
}

// I/O template
type Io struct {
	reader    *bufio.Reader
	writer    *bufio.Writer
	tokens    []string
	nextToken int
}

func NewIo() *Io {
	return &Io{
		reader: bufio.NewReader(os.Stdin),
		writer: bufio.NewWriter(os.Stdout),
	}
}

func (io *Io) Flush() {
	err := io.writer.Flush()
	if err != nil {
		panic(err)
	}
}

func (io *Io) NextLine() string {
	var buff []byte
	for {
		line, isPrefix, err := io.reader.ReadLine()
		if err != nil {
			panic(err)
		}
		buff = append(buff, line...)
		if !isPrefix {
			break
		}
	}
	return string(buff)
}

func (io *Io) Next() string {
	for io.nextToken >= len(io.tokens) {
		line := io.NextLine()
		io.tokens = strings.Fields(line)
		io.nextToken = 0
	}
	s := io.tokens[io.nextToken]
	io.nextToken++
	return s
}

func (io *Io) NextInt() int {
	i, err := strconv.Atoi(io.Next())
	if err != nil {
		panic(err)
	}
	return i
}

func (io *Io) NextFloat() float64 {
	i, err := strconv.ParseFloat(io.Next(), 64)
	if err != nil {
		panic(err)
	}
	return i
}

func (io *Io) Println(a ...interface{}) {
	fmt.Fprintln(io.writer, a...)
}

func (io *Io) Printf(format string, a ...interface{}) {
	fmt.Fprintf(io.writer, format, a...)
}

func (io *Io) PrintIntSlice(a []int) {
	b := []interface{}{}
	for _, x := range a {
		b = append(b, x)
	}
	io.Println(b...)
}

func (io *Io) PrintStringSlice(a []string) {
	b := []interface{}{}
	for _, x := range a {
		b = append(b, x)
	}
	io.Println(b...)
}

func Log(name string, value interface{}) {
	fmt.Fprintf(os.Stderr, "%s=%+v\n", name, value)
}

func ExampleIo() {
	io := NewIo()
	defer io.Flush()
	a := make([]int, 0, 3)
	a[0], a[1], a[2] = io.NextInt(), io.NextInt(), io.NextInt()
	io.Println(a)
	io.PrintIntSlice(a)
	Log("io", a)
}

C++: #include<bits/stdc++.h>
using namespace std;

using i64 = int64_t;

int board[13][7]={0};

void init(int h){
    for(int i=1;i<=h;++i){
        for(int j=1;j<=5;++j){
            board[i][j] = 0;
        }
    }
    for(int i=0;i<7;++i){
        board[0][i] = -1;
        board[h+1][i] = -1;
    }
    for(int i=0;i<=h+1;++i){
        board[i][0] = -1;
        board[i][6] = -1;
    }
}

int erase(int h){
    int score = 0;
    for(int i=1;i<=h;++i){
        int cnt = 0, num = -1;
        for(int j=1;j<=6;++j){
            if(board[i][j] == num)cnt++;
            else{
                if(cnt >= 3){
                    int idx = j-1;
                    while(board[i][idx] == num){
                        score += num;
                        board[i][idx] = 0;
                        idx--;
                    }
                }
                cnt = 1;
                num = board[i][j];
            }
        }
    }
    return score;
}

bool drop(int h){
    bool dropped = false;
    for(int i=h;i>0;--i){
        for(int j=1;j<=5;++j){
            if(board[i][j] == 0){
                int idx = i-1;
                while(board[idx][j] == 0)idx--;
                if(board[idx][j] == -1)continue;
                board[i][j] = board[idx][j];
                board[idx][j] = 0;
                dropped = true;
            }
        }
    }
    return dropped;
}

void print(int h){
    cout << "---" << endl;
    for(int i=1;i<=h;++i){
        for(int j=1;j<=5;++j){
            printf("%2d",board[i][j]);
        }
        cout << endl;
    }
    cout << "***" << endl;
}

int main(){
    int h;
    while(cin >> h, h != 0){
        init(h);
        for(int i=1;i<=h;++i){
            for(int j=1;j<=5;++j){
                cin >> board[i][j];
            }
        }
        //print(h);
        bool res = true;
        int ans = 0;
        do{
            ans += erase(h);
            //print(h);
            res = drop(h);
            //print(h);
        }while(res);
        //print(h);
        cout << ans << endl;
    }

    return 0;
}

C++: #include <bits/stdc++.h>

using namespace std;

#define FOR(i,s,e) for((i)=(s);(i)<(int)(e);(i)++)
#define REP(i,e) FOR(i,0,e)

#define all(o) (o).begin(), (o).end()
#define psb(x) push_back(x)
#define mp(x,y) make_pair((x),(y))

typedef long long ll;
typedef pair<int, int> PII;

const double EPS = 1e-10;

const int H = 10;
const int W = 5;
int h;
int c[H][W];

int main() {
  int i, j, k, l;
  int res;

  while (1) {
    scanf("%d ", &h); 
    if (!h) break;

    for (i=0; i<h; i++)
      for (j=0; j<W; j++)
        scanf("%d ", &(c[i][j]));

    res = 0;
    bool update = true;
    while (update) {
      update = false;
      for (i=h-1; i>=0; i--) {
        for (j=0; j<3; j++) {
          k = 1;
          while (c[i][j]!=0 && j+k<W && c[i][j+k]==c[i][j]) k++;
          if (k >= 3) {
            res += k * c[i][j];
            for (l=j; l<j+k; l++) c[i][l] = 0;
            update = true;
            break;
          }
        }
      }

      for (i=h-2; i>=0; i--)
        for (j=0; j<W; j++) {
          int d = i;
          while (d+1<h && c[d+1][j]==0) d++;
          if (i!=d) {
            c[d][j] = c[i][j];
            c[i][j] = 0;
          }
        }
    }

    printf("%d\n", res);
  }

  return 0;
}

C++: #include <iostream>
using namespace std;
int h,count,sum;
bool flag;
int puz[11][5];
int main(){
	while(1){
		cin >>h;
		if(h==0)break;
		for(int i=0;i<h;i++){
			for(int j=0;j<5;j++){
				cin >>puz[i][j];
			}
		}

		sum=0;
		while(1){
			flag=false;
			count=0;

			for(int i=0;i<h;i++){
				if(puz[i][0]==puz[i][1]&&puz[i][1]==puz[i][2]&&puz[i][0]!=0){
					sum+=puz[i][0]*3;
					if(puz[i][0]==puz[i][3]){
						sum+=puz[i][0];
						if(puz[i][0]==puz[i][4]){
							sum+=puz[i][0];
							puz[i][4]=0;
						}
						puz[i][3]=0;
					}
					puz[i][0]=puz[i][1]=puz[i][2]=0;
					flag=true;
					count++;
				}else if(puz[i][1]==puz[i][2]&&puz[i][2]==puz[i][3]&&puz[i][1]!=0){
					sum+=puz[i][1]*3;
					if(puz[i][1]==puz[i][4]){
						sum+=puz[i][1];
						puz[i][4]=0;
					}
					puz[i][1]=puz[i][2]=puz[i][3]=0;
					flag=true;
					count++;
				}else if(puz[i][2]==puz[i][3]&&puz[i][3]==puz[i][4]&&puz[i][2]!=0){
					sum+=puz[i][2]*3;
					puz[i][2]=puz[i][3]=puz[i][4]=0;
					flag=true;
					count++;
				}
			}

			if(!flag)break;
			for(int k=0;k<count;k++){
				for(int i=h-2;i>=0;i--){
					for(int j=0;j<5;j++){
						if(puz[i+1][j]==0){
							puz[i+1][j]=puz[i][j];
							puz[i][j]=0;
						}
					}
				}
			}

		}
		cout<<sum<<endl;
	}
}