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;
#define rep(i,n) for(ll i=0;i<n;i++)
#define repl(i,l,r) for(ll i=(l);i<(r);i++)
#define per(i,n) for(ll i=n-1;i>=0;i--)
#define lper(i,r,l) for(ll i=r-1;i>=l;i--)
#define fi first
#define se second
#define mp make_pair
#define pb push_back
#define ins insert
#define pqueue(x) priority_queue<x,vector<x>,greater<x>>
#define all(x) (x).begin(),(x).end()
#define CST(x) cout<<fixed<<setprecision(x)
#define vtpl(x,y,z) vector<tuple<x,y,z>>
#define at(x,i) get<i>(x);
#define rev(x) reverse(x);
using ll=long long;
using vl=vector<ll>;
using vvl=vector<vector<ll>>;
using pl=pair<ll,ll>;
using vpl=vector<pl>;
using vvpl=vector<vpl>;
const ll MOD=1000000007;
const ll MOD9=998244353;
const int inf=1e9+10;
const ll INF=4e18;
const ll dy[8]={1,0,-1,0,1,1,-1,-1};
const ll dx[8]={0,-1,0,1,1,-1,1,-1};
template<class T> inline bool chmin(T& a, T b) {
    if (a > b) {
        a = b;
        return true;
    }
    return false;
}
template<class T> inline bool chmax(T& a, T b) {
    if (a < b) {
        a = b;
        return true;
    }
    return false;
}
int main(){
    while(true){
    ll h;cin >> h;
    if(h==0)break;
    vvl f(h,vl(5,0));
    per(i,h){
        rep(j,5)cin >> f[i][j];
    }
    ll ans=0;
    bool check=true;
    while(check){
        ll tmp=ans;
        vvl d(h,vl(5,0));
        rep(i,h){
            ll a=f[i][0];
            ll cnt=0;
            rep(j,5){
                if(a==f[i][j])cnt++;
                else{
                    if(cnt>=3){
                        rep(l,cnt){
                            f[i][j-l-1]=0;
                        }  
                        repl(k,i+1,h){
                            rep(l,cnt){
                                d[k][j-l-1]++;
                            }    
                        }
                        ans+=a*cnt;
                    }
                    a=f[i][j];
                    cnt=1;
                }
            }
            if(cnt>=3){
                rep(l,cnt){
                    f[i][4-l]=0;
                } 
                repl(k,i+1,h){
                    rep(l,cnt){
                        d[k][4-l]++;
                    }  
                }
                ans+=a*cnt;
            }
        }
        rep(i,h){
            rep(j,5){
                if(d[i][j]){
                    f[i-d[i][j]][j]=f[i][j];
                    f[i][j]=0;
                }
            }
        }
        /*rep(i,h){
            rep(j,5)cout << d[i][j] <<" ";
            cout <<endl;
        }*/
        if(tmp==ans)break;
    }
    /*rep(i,h){
        rep(j,5)cout << f[i][j] <<" ";
        cout <<endl;
    }*/
    cout <<ans <<endl;
    }
}

C++: #include <iostream>
using namespace std;
static const int N = 10;
int main(){
  int H,i,j,k,l,com,cnt,start,score,flag;//com=compare
  char c;
  string str[N],cp[N];
  while(1){
    score=0;
    cin >> H;
    if(H==0) break;
    for(i=0;i<H;i++){
      str[i]="";
      for(j=0;j<5;j++){
    cin >> c;
    str[i]+=c;
      }
    }
    while(1){
      for(i=0;i<H;i++){
    cnt=0;
    com=str[i][0];
    start=0;
    for(j=0;j<5;j++){
      if(com==str[i][j]) cnt++;
      else{
        if(cnt>=3){
          if(com!='e'){
        score+=cnt*(com-'0');
          }
          for(k=start;k<=j-1;k++){
        str[i][k]='e';//e=end
          }
          com=str[i][j];
          start=j;
          cnt=1;
        }else{
          com=str[i][j];
          start=j;
          cnt=1;
        }
      }
    }
    if(cnt>=3){
      if(com!='e'){
        score+=cnt*(com-'0');
      }
      for(k=start;k<=j;k++){
        str[i][k]='e';//e=end
      }
    }
      }
      for(i=0;i<5;i++){
    for(j=H-1;j>=0;j--){
      if(j-1>=0&&str[j][i]=='e'){
        l=j;
        while(1){
          l--;
          if(l==-1) break;
          if(str[l][i]!='e'){
        str[j][i]=str[l][i];
        str[l][i]='e';
        break;
          }
        }
      }
    }
      }
      flag=0;
      for(i=0;i<H;i++) if(cp[i]!=str[i]) flag=1;
      if(flag==0) break;
      for(i=0;i<H;i++) cp[i]=str[i];
    }
    cout << score << endl;
  }
  return 0;
}

C++: #include <iostream>
using namespace std;
int main(){
  int h;
  while (cin>>h,h|h!=0){
    string temp;
    int board[h][6];
    for (int i=0;i<h;i++){
      cin>>board[i][0]>>board[i][1]>>board[i][2]>>board[i][3]>>board[i][4];
    }
    int num,count;
    int check=0;
    int score=0;
    while (1){
      check=score;
      for (int i=h-2;i>=0;i--){
	for (int j=0;j<5;j++){
	  for (int k=h-1;k>i;k--){
	    if (board[k][j]==0){
	      board[k][j]=board[i][j];
	      board[i][j]=0;
	      break;
	    }
	  }
	}
      }
      for (int i=0;i<h;i++){
	count=1;
	num=0;
	for (int j=0;j<5;j++){
	  if (board[i][j]==num){
	    count++;
	  }
	  else{
	    if (count>2)
	      break;
	    count=1;
	  }
	  num=board[i][j];
	}
	if (count<=2)
	  num=0;
	score=score+num*count;
	int ii=0;
	for (int j=0;j<5;j++){
	  if (board[i][j]==num){
	    board[i][j]=0;
	    ii++;
	  }
	  if (ii==count)
	    break;
	}
      }
      /*for (int i=0;i<h;i++){
	for (int j=0;j<5;j++){
	  cout<<board[i][j]<<" ";
	}
	cout<<endl;
	}*/
      if (check==score){
	break;
      }
      // cout<<" "<<score<<endl;
    }

    cout<<score<<endl; 
  }
}