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++: #include <iostream>
#include <map>
#include <algorithm>
#include <vector>
#include <stack>
#include <math.h>

using namespace std;

#define T 800

int main(int argc, char const *argv[])
{
	int N,M;
	int r;
	int t,n,m,s;
	int q;
	int ts,te;
	int ans;

	while(1){
		cin>>N>>M;
		if(N+M==0) break;

		map<int,vector<int> > lio;

		for(int i1=0;i1<M;i1++){
			vector<int> v(T);
			fill(v.begin(), v.end(),0);
			lio[i1]=v;
		}

		cin>>r;
		for(int i1=0;i1<r;i1++){
			cin>>t>>n>>m>>s;
			vector<int> v=lio[m-1];
			if(s==1) v[t-540]=1;
			else v[t-540]=-1;
			lio[m-1]=v;
		}

		for(int i1=0;i1<M;i1++){
			vector<int> v=lio[i1];
			for(int i2=1;i2<T;i2++){
				v[i2]=v[i2-1]+v[i2];
			}
			lio[i1]=v;
		}

		cin>>q;
		for(int i1=0;i1<q;i1++){
			cin>>ts>>te>>m;

			vector<int> v=lio[m-1];
			ans=0;
			for(int i2=ts-540;i2<te-540;i2++){
				if(v[i2]>0) ans++;
			}
			cout<<ans<<endl;
		}



	}
	return 0;
}

C++: #include<bits/stdc++.h>

using namespace std;
#define REP(i,n) for(int (i)=0;(i)<(n);++(i))

using vi = vector<int>;
using mvi = map<int,vi>;

int main()
{
  int n,m;
  while(cin >> n >> m,n+m){
    mvi mv;
    int r;
    cin >> r;
    REP(i,r){
      int t,_n,_m,s;
      cin >> t >> _n >> _m >> s;
      if(s){
        if(mv.find(_m) == mv.end()){
          mv[_m].resize(1300,0);
        }
        mv[_m][t]++;
      }else{
        mv[_m][t]--;
      }
  }
    for(auto it = mv.begin();it != mv.end();++it){
      REP(i,1300-1){
        it->second[i+1] += it->second[i];
      }
    }
    int q;
    cin >>q;
    REP(i,q){
      int t1,t2,_m;
      cin >> t1 >> t2 >> _m;
      int ans = 0;
      if(mv.find(_m)!=mv.end()){
        auto mc = mv[_m];
        for(int i = t1;i < t2;++i){
          if(mc[i]>0){
            ans++;
          }
        }
      }
      cout << ans << endl;
    }
  }
}

C++: #include <bit/stdc++.h> 
#define REP(i,n) for(int i=0; i< (n); ++i)
#define FOR(i,s,n) for(int i=s; i< (n); ++i)
using namespace std;
using vi = vector<int>;
using vvi = vector<vi>;

int main() {
    cin.tie(0);
    ios_base::sync_with_stdio(false);
 
    cout << fixed << setprecision(30);
 
    while (true){
        int N, M; cin >> N >> M;
        if (N == 0) break;
        int r; cin >> r;
 
        vvi students(M, vi(1262, 0));
 
        REP(i, r){
            int t, n, m, s;
            cin >> t >> n >> m >> s; m--;
            if (s == 1){
                students[m][t]++;
            } else {
                students[m][t]--;
            }
        }
 
        REP(i, M) FOR(j, 1, 1262) students[i][j] += students[i][j - 1];
 
        int q; cin >> q;
        REP(i, q){
            int ts, te, m;
            cin >> ts >> te >> m; m--;
            int cnt = 0;
            FOR(j, ts, te) if (students[m][j] >= 1) cnt++;
            cout << cnt << endl;
        }
    }
    return 0;
}