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(void){
    int h;
    while (cin>>h) {
        if (h==0) {
            break;
        }
        std::vector<vector<int>> vec(h,vector<int>(5));
        int a;
        for (int i=0;i<h;i++) {
            for (int j=0;j<5;j++) {
                cin>>a;
                vec[i][j]=a;
            }
        }
        int flag=0,score=0;
        while (1) {
            flag=0;
            for (int i=0;i<h;i++) {
                if (vec[i][0]!=0&&vec[i][0]==vec[i][1]&&vec[i][0]==vec[i][2]&&vec[i][0]==vec[i][3]&&vec[i][0]==vec[i][4]) {
                    score+=vec[i][0]*5;
                    flag=1;
                    for (int j=0;j<5;j++) {
                        vec[i][j]=0;
                    }
                } else if (vec[i][0]!=0&&vec[i][0]==vec[i][1]&&vec[i][0]==vec[i][2]&&vec[i][0]==vec[i][3]) {
                    score+=vec[i][0]*4;
                    flag=1;
                    for (int j=0;j<4;j++) {
                        vec[i][j]=0;
                    }
                } else if (vec[i][1]!=0&&vec[i][1]==vec[i][2]&&vec[i][1]==vec[i][3]&&vec[i][1]==vec[i][4]) {
                    score+=vec[i][1]*4;
                    flag=1;
                    for (int j=1;j<5;j++) {
                        vec[i][j]=0;
                    }
                } else if (vec[i][0]!=0&&vec[i][0]==vec[i][1]&&vec[i][0]==vec[i][2]) {
                    score+=vec[i][0]*3;
                    flag=1;
                    for (int j=0;j<3;j++) {
                        vec[i][j]=0;
                    }
                } else if (vec[i][1]!=0&&vec[i][1]==vec[i][2]&&vec[i][1]==vec[i][3]) {
                    score+=vec[i][1]*3;
                    flag=1;
                    for (int j=1;j<4;j++) {
                        vec[i][j]=0;
                    }
                } else if (vec[i][2]!=0&&vec[i][2]==vec[i][3]&&vec[i][2]==vec[i][4]) {
                    score+=vec[i][2]*3;
                    flag=1;
                    for (int j=2;j<5;j++) {
                        vec[i][j]=0;
                    }
                }
            }
            if (flag==0) {
                cout<<score<<endl;
                break;
            } else {
                for (int i=h-1;i>=0;i--) {
                    for (int j=0;j<5;j++) {
                        if (vec[i][j]!=0) {
                            int tmp=i;
                            while (tmp+1<h&&vec[tmp+1][j]==0) {
                                swap(vec[tmp][j],vec[tmp+1][j]);
                                tmp++;
                            }
                        }
                    }
                }
                /*
                for (int i=0;i<h;i++) {
                    for (int j=0;j<5;j++) {
                        cout<<vec[i][j]<<" ";
                    }
                    cout<<endl;
                }
                cout<<endl;
                */
            }
        }
    }
}

C++: #include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
int main(){
  int H;
  //?????????????????¶????????\???
  while (cin >> H && H>0) {
    vector< vector<int> > c(5,vector<int>(H));
    int sum = 0;
    for (int i=H-1; i>=0; i--){
      for (int j=0; j<5; j++){
	cin >> c[j][i];
      }
    }
    //????????°??????3?????\????¨???????????????´???????????°????¨??????????0?????????
    int flg = 1;
    while (flg) {
      flg = 0;
      for (int i=H-1; i>=0; i--){
	for (int j=0; j<3; j++) {
	  int cnt = 1;
	  for (int k=j+1; k<5; k++) {
	    if (c[j][i] == c[k][i])
	      cnt++;
	    if (c[j][i] != c[k][i] || k == 4) {
	      if (cnt >= 3) {
		sum += c[j][i] * cnt;
		for (int l=j; l<=k; l++) {
		  c[l][i] = 0;
		}
		flg = 1;
	      }
	    }
	  }
	}
      }
      for (int j=0; j<5; j++) {
	remove(c[j].begin(), c[j].end(), 0), c[j].end();
      }
    }
    //???????????????????????????0????????£??????flg==0??¨?????????????????±???
    cout << sum << endl;
  }
}