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;
int main(){
	int H;
	while(cin>>H,H){
		int W = 5;
		int fi[20][20];
		for(int i = 0;i < H;i++){
			for(int j = 0;j < W;j++){
				cin>>fi[i][j];
			}
		}
		int sc = 0;
		int D = 10;
		int p = 0;
		while(D--){
			bool er[20][20] = {};
			for(int i = 0;i < H;i++){
				for(int j = 1;j < W - 1;j++){
					if(fi[i][j-1] == fi[i][j] && fi[i][j] == fi[i][j+1]){
						er[i][j] = true;
						er[i][j-1] = true;
						er[i][j+1] = true;
					}
				}
				for(int j = 0;j < W;j++){
					if(er[i][j]){
						p += fi[i][j];
						fi[i][j] = 0;
					}
				}
			}
			int h = H+5;
			while(h--){
				for(int i = H - 1;i > 0;i--){
					for(int j = 0;j < W;j++){
						if(fi[i][j] == 0){
							swap(fi[i][j],fi[i-1][j]);
						}
					}
				}
			}/*
			cout<<"***"<<endl;
			for(int i = 0;i < H;i++){
				for(int j = 0;j < W;j++){
					cout<<fi[i][j];
				}
				cout<<endl;
			}*/
		}
		cout<<p<<endl;
	}
}

C++: #include<iostream>
using namespace std;
int main()
{
  int h;
  for(;cin>>h,h;)
    {
      int board[h][5];
      for(int i=0;i<h;i++)
	for(int j=0;j<5;j++)
	  cin>>board[i][j];
      int ans=0;
      while(true)
	{
	  int add=0;
	  for(int i=0;i<h;i++)
	    {
	      for(int j=0;j<3;j++)
		if(board[i][j]==board[i][j+1]&&
		   board[i][j+1]==board[i][j+2] )
		  {
		    int jj = j;
		    while(jj < 5 &&board[i][j]==board[i][jj])
		      jj++;
		    for(int x=j;x<jj;x++)
		      {
			add+=board[i][x];
			board[i][x]=0;
		      }

		  }
	    }
	  ans+=add;
	  if(add==0)
	    break;

	for(int i=h-1;i>0;i--)
	  {
	    for(int j=0;j<5;j++)
	      {
		if(board[i][j]==0)
		  {
		    for(int ii=i-1;ii>=0;ii--)
		      if(board[ii][j]!=0)
			{
			  board[i][j]=board[ii][j];
			  board[ii][j]=0;
			  break;
			}
		  }
	      }
	  }
	/*
	cerr<<endl;
	for(int i=0;i<h;i++,cerr<<endl)
	  for(int j=0;j<5;j++)
	    cerr<<board[i][j]<<" ";
	cerr<<endl;
	*/
	}

      cout<<ans<<endl;
    }

}

C++: #include <iostream>
#include <vector>
#include <algorithm>
#include <string>

using namespace std;

int bord[11][5];
int H;
void solve(){
  int score = 0;
  int comboStart;
  int comboEnd;
  int tmp;
  bool combo ;

  while(true){
    //combo_check
    // cout << endl << "score =" << score << endl;
    // for(int height = H-1 ;height >= 0 ; height--){
    //   for(int width = 0; width < 5; width++){
    //     cout << bord[height][width] << " ";
    //   }
    //   cout << endl;
    // }
    combo = false;
    for(int height = H - 1 ;height >= 0 ; height--){
      for(int width = 2; width < 5; width++){
        if(bord[height][width-2] == bord[height][width-1] && bord[height][width-1] ==  bord[height][width] && bord[height][width] != -1 &&bord[height][width] != 0){
          combo = true;
          //combo 長さ確認
          comboStart = width - 2;
          comboEnd = width;
          while(true){//combo 長さ決定
            if(comboEnd+1 < 5 && bord[height][comboEnd] == bord[height][comboEnd+1]){
              comboEnd++;
            }else{
              break;
            }
          }

          score += bord[height][comboStart] * (comboEnd - comboStart + 1);
          for(int w = comboStart; w <= comboEnd; w++) bord[height][w] = -1;
        }
      }
    }
    if(!combo) break; //これ以上コンボが無いなら終了

    //コンボしたブロックをずらす
    for(int height = 0 ;height < H ; height++){
      for(int width = 0; width < 5; width++){
        if(bord[height][width] == -1){
          for(int h = height ; h < H; h++){
            bord[h][width] = bord[h+1][width];
          }
          height -- ;
        }
      }
    }
  }
  cout << score << endl;
  for(int height = 0 ;height < 11 ; height++){
    for(int width = 0; width < 5; width++){
      bord[height][width] = 0;
    }
  }
}

int main(){
  while(true){
    cin >> H;
    if(H == 0)break;
    for(int height = H - 1 ;height >= 0 ; height--){
      for(int width = 0; width < 5; width++){
        cin >> bord[height][width];
      }
    }
    solve();
  }
  return 0;
}