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 != 0){
        vector<vector<int>> field(h, vector<int>(5));
        for(int i = 0; i < h; i++){
            for(int j = 0; j < 5; j++){
                cin >> field[i][j];
            }
        }
        
        int ans = 0;
        
        while(1){
            bool flag = true;
            for(int i = 0; i < h; i++){
                if(field[i][0] == field[i][1] && field[i][1] == field[i][2] && field[i][2] == field[i][3] && field[i][3] == field[i][4] && field[i][4] != 0){
                    flag = false;
                    ans += field[i][0] * 5;
                    field[i][0] = field[i][1] = field[i][2] = field[i][3] = field[i][4] = 0;
                }
            }
    
            for(int i = 0; i < h; i++){
                if(field[i][0] == field[i][1] && field[i][1] == field[i][2] && field[i][2] == field[i][3] && field[i][3] != 0){
                    flag = false;
                    ans += field[i][0] * 4;
                    field[i][0] = field[i][1] = field[i][2] = field[i][3] = 0;
                }
                if(field[i][1] == field[i][2] && field[i][2] == field[i][3] && field[i][3] == field[i][4] && field[i][4] != 0){
                    flag = false;
                    ans += field[i][1] * 4;
                    field[i][1] = field[i][2] = field[i][3] = field[i][4] = 0;
                }
            }
    
            for(int i = 0; i < h; i++){
                if(field[i][0] == field[i][1] && field[i][1] == field[i][2] && field[i][2] != 0){
                    flag = false;
                    ans += field[i][0] * 3;
                    field[i][0] = field[i][1] = field[i][2] = 0;
                }
                if(field[i][1] == field[i][2] && field[i][2] == field[i][3] && field[i][3] != 0){
                    flag = false;
                    ans += field[i][1] * 3;
                    field[i][1] = field[i][2] = field[i][3] = 0;
                }
                if(field[i][2] == field[i][3] && field[i][3] == field[i][4] && field[i][4] != 0){
                    flag = false;
                    ans += field[i][2] * 3;
                    field[i][2] = field[i][3] = field[i][4] = 0;
                }
            }
    
            for(int i = h - 2; i >= 0; i--){
                for(int j = 0; j < 5; j++){
                    if(field[i+1][j] != 0) continue;
                    for(int k = i + 1; k < h; k++){
                        if(field[k][j] != 0){
                            field[k-1][j] = field[i][j];
                            field[i][j] = 0;
                            break;
                        }
                        if(k == h - 1){
                            field[k][j] = field[i][j];
                            field[i][j] = 0;
                        }
                    }
                }
            }
            if(flag){
                cout << ans << endl;
                break;
            }
        }
    }
}

C++: #include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

#define rep(i,x,y) for(int (i)=(x);(i)<(y);(i)++)

int main()
{

  while(true){
    vector<int> H[5];
    int n;

    cin>>n;
    if(n==0){
      break;
    }
    rep(i,0,n){
      rep(j,0,5){
        int temp;
        cin>>temp;
        H[j].insert(H[j].begin(),temp);
      }
    }

    int score=0;
    bool flag=true;
    while(flag==true){
      flag=false;
      rep(i,0,n){
        rep(j,0,3){
          if(H[j][i]==-1||H[j][i]==-2){
            continue;
          }
          int count=1;
          int k=j;
          while(true){
            k++;
            if(k>=5){
              break;
            }
            if(H[j][i]==H[k][i]){
              count++;
            }else{
              break;
            }
          }
          if(count>=3){
            flag=true;
            score+=count*H[j][i];
            rep(ii,j,k){
              H[ii][i]=-1;
            }
            break;
          }
        }
      }

      rep(i,0,5){
        int cnt=0;
        auto iter=H[i].begin();
        while(iter!=H[i].end())
          if(*iter==-1){
            iter=H[i].erase(iter);
            cnt++;
          }else{
            iter++;
          }
        rep(j,0,cnt){
          H[i].push_back(-2);
        }
      }
    }

    cout<<score<<endl;
  }
  return 0;
}