Go: package main

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

func main() {
	io := NewIo()
	defer io.Flush()
	for {
		_, M := io.NextInt(), io.NextInt()
		if M == 0 {
			break
		}
		r := io.NextInt()
		t, m, s := make([]int, r), make([]int, r), make([]int, r)
		for i := 0; i < r; i++ {
			t[i], _, m[i], s[i] = io.NextInt(), io.NextInt(), io.NextInt()-1, io.NextInt()
		}
		q := io.NextInt()
		for i := 0; i < q; i++ {
			ss, ee, mm := io.NextInt(), io.NextInt(), io.NextInt()-1
			x := make([]int, 1300)
			for j := 0; j < r; j++ {
				if m[j] == mm {
					if s[j] == 1 {
						x[t[j]]++
					} else {
						x[t[j]]--
					}
				}
			}
			for j := 1; j < 1300; j++ {
				x[j] = x[j] + x[j-1]
			}
			ans := 0
			for j := ss; j < ee; j++ {
				if x[j] > 0 {
					ans++
				}
			}
			io.Println(ans)
		}
	}
}

// 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++: 
//http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=1148&lang=jp

#include<iostream>
#include<map>
#include<vector>
#include<algorithm>
#include<cmath>
#include<climits>
#include<ctime>
#include<cstring>
#include<numeric>

#define ALL(v) (v).begin(),(v).end()
#define REP(i,p,n) for(int i=p;i<(int)(n);++i)
#define rep(i,n) REP(i,0,n)
#define dump(a) (cerr << #a << "=" << (a) << endl)
#define DUMP(list) cout << "{ "; for(auto nth : list){ cout << nth << " "; } cout << "}" << endl;

using namespace std;

int main()
{
	int N,M;

	while(cin >> N >> M && N)
	{
		vector<int> PC(N+1);
		int record[M+1][1261];
		fill_n((int *)record, sizeof(record) / sizeof(int), 0);

		int R;
		cin >> R;
		rep(nth,R)
		{
			int t,n,m,s;
			cin >> t >> n >> m >> s;
			if(s == 1){
				PC[n] = t;
			}else{
				REP(i,PC[n],t){
					record[m][i] = 1;
				}
				PC[n] = 0;
			}
		}

		int Q;
		cin >> Q;
		rep(nth,Q)
		{
			int ts, te, m;
			cin >> ts >> te >> m;
			int ans=0;
			REP(i,ts,te){
				if(record[m][i]){ ans+=1; }
			}
			cout << ans << endl;
		}
	}

	return 0;
}

C++: #include<iostream>
#include<string>
#include<vector>
#include<utility>
#include<queue>
#include<algorithm>
#include<cmath>
#include<cstdio>
#include<cstring>
#include<cstdlib>
#include<map>
#include<complex>
#define INF 2147483647
#define llINF 9223372036854775807
#define pb push_back
#define mp make_pair 
#define F first
#define S second
#define ll long long

using namespace std;
int main(){
  int N,M;
  while(cin>>N>>M,N){
    int num[M+10][730]={};
    int r;cin>>r;
    for(int i=0;i<r;i++){
      int t,n,m,s;cin>>t>>n>>m>>s;
      if(s)num[m][t-535]++;
      else num[m][t-535+1]--;
    }
    int q;cin>>q;
    for(int i=0;i<q;i++){
      int ans=0;
      int ts,te,mm;cin>>ts>>te>>mm;
      ts-=535;
      te-=535;
      int now=0;
      for(int i=0;i<730;i++){
	int mae=now;
	now+=num[mm][i];
	//	cout<<now<<" "<<i<<":"<<" ";
	if(ts<i&&i<=te&&now>0){
	  // cout<<now<<" "<<i<<endl;
	  if(mae==0)ans--;
	  ans++;
	}
      }
      cout<<ans<<endl;
    }
  }
  return 0;
}

C++: #include <iostream>

using namespace std;

int main(){

	int n,m;
	int r;
	int q;

	//int student[10000][800];



	int **student = new int*[1005];
	for(int i=0;i<1005;i++){
		student[i] = new int[800];
	}


	int *realToImage;
	realToImage = new int[10005];

	int *imageToReal;
	imageToReal = new int[2000];

	while(cin>>n>>m){
		if(n==0&&m==0)break;

		int studentNum=0;

		for(int i=0;i<2000;i++){
			imageToReal[i]=-1;
		}

		for(int i=0;i<10005;i++){
			realToImage[i]=-1;
		}

		for(int i=0;i<1005;i++){
			for(int j=0;j<800;j++){
				student[i][j]=0;
				
			}
		}
		//cout<<"unko"<<endl;
		cin>>r;

		for(int i=0;i<r;i++){
			int tmpT,tmpN,tmpM,tmpS;
			cin>>tmpT>>tmpN>>tmpM>>tmpS;

			if(realToImage[tmpM]==-1){
				realToImage[tmpM]=studentNum;
				imageToReal[studentNum]=tmpM;
				studentNum++;
			}

			int image=realToImage[tmpM];
			if(tmpS==1){
				student[image][tmpT-540]++;
			}
			else{
				student[image][tmpT-540]--;
			}
		}

		for(int i=0;i<1000;i++){
			int num=0;
			for(int j=0;j<800;j++){
				if(student[i][j]==1){
					num++;
				}
				else if(student[i][j]==-1){
					num--;
				}
				student[i][j]=num;
			}
		}

		cin>>q;

		for(int i=0;i<q;i++){
			int start,end,studentM;
			cin>>start>>end>>studentM;
			start-=540;
			end-=540;

			int cnt=0;

			if(realToImage[studentM]==-1){
				cout<<0<<endl;
				continue;
			}

			int ansImage=realToImage[studentM];

			for(int j=start;j<end;j++){
				if(student[ansImage][j]>0){
					cnt++;
				}
			}

			cout<<cnt<<endl;
		}


	}

	return 0;


}