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<bits/stdc++.h>
#define range(i,a,b) for(int i = (a); i < (b); i++)
#define rep(i,b) for(int i = 0; i < (b); i++)
#define all(a) (a).begin(), (a).end()
#define debug(x) cout << "debug " << x << endl;
const int INF = 100000000;
using namespace std;

void request(vector<vector<pair<int, int>>> v, int q){
    int s, l, m;
    rep(i,q){
        int t[1260 - 540] = {0};
        cin >> s >> l >> m;
        s-=540; l-=540; m--;
        rep(j,v[m].size()){
            t[v[m][j].first - 540]++;
            t[v[m][j].second - 540]--;
        }
        int c = 0, cnt = 0;
        rep(j,1260 - 540){
            c+=t[j];
            if(j >= s && j < l && c > 0) cnt++;
        }
        cout << cnt << endl;
    }
}

void inputData(vector<vector<pair<int, int>>> &v, int r){
    int pc[1001][2] = {0};
    rep(j,r){
        int t, n, m, s;
        cin >> t >> n >> m >> s;
        n--; m--;
        if(s){
            pc[n][0] = t;
        }else if(pc[n][0] != 0){
            bool f = true;
            rep(i,v[m].size()){
                if(v[m][i].first <= pc[n][0] && v[m][i].second >= pc[n][0]){
                    if(v[m][i].second < t){
                        v[m][i].second = t;
                    }
                    f = false;
                    break;
                }else if(v[m][i].first <= t && v[m][i].second >= t){
                    if(v[m][i].first > pc[n][0]){
                        v[m][i].first = pc[n][0];
                    }
                    f = false;
                    break;
                }else if(v[m][i].first >= pc[n][0] && v[m][i].second <= t){
                    v[m][i].first = pc[n][0];
                    v[m][i].second = t;
                    f = false;
                    break;
                }
            }
            if(f) v[m].emplace_back(make_pair(pc[n][0], t));
            pc[n][0] = 0;
        }
    }
}

int main(){
    int n, m, r, q;
    while(cin >> n >> m, n||m){
        vector<vector<pair<int, int>>> v(10001);
        cin >> r;
        inputData(v, r);
        cin >> q;
        request(v, q);

        //rep(i,m){ rep(j,v[i].size()){ cout << v[i][j].first << ' ' << v[i][j].second << endl; } cout << endl; }
    }
}

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

using namespace std;

const int MaxN = 1001;
const int MaxM = 10001;

int N, M;

int main() {
  int count[MaxM];

  while(cin>>N>>M && !(N==0 && M==0)) {
    vector < vector< pair<int,int> > > logg(MaxM);
    int r;
    cin>>r;
    int t,n,m,s;
    for(int i=0; i<MaxM; i++) { // init
      count[i] = 0;
    }
    for(int i=0; i<r; i++) {
      cin>>t>>n>>m>>s;
      if(s == 1) { // login
	count[m]++;
	if(count[m] == 1) {
	  logg[m].push_back(make_pair(t,t));
	}
      }
      else { // logout
	count[m]--;
	if(count[m] == 0) {
	  logg[m].back().second = t;
	}
      }
    }
    int q;
    cin>>q;
    for(int i=0; i<q; i++) {
      int ts, te, m, ans = 0;
      cin>>ts>>te>>m;
      int ans1, ans2; // 4debug ans1は誤りらしい; エラーデータを弾けないから?
      for(int j=0; j<logg[m].size(); j++) {
	
	if(logg[m][j].first == logg[m][j].second) {
	  logg[m][j].second = te;
	}
	
	if(logg[m][j].first < te) {
	  ans1 = min(te, logg[m][j].second)-max(ts, logg[m][j].first);
	}
	else {
	  ans1 = 0;
	}
	ans2 = max(0, min(te,logg[m][j].second)-max(ts,logg[m][j].first));
	
	/*
        if(ans1!=ans2) {
	  cout<<"Q: "<<ts<<" "<<te<<endl;
	  cout<<"why: "<<min(te, logg[m][j].second)-max(ts, logg[m][j].first)<<endl;
	  cout<<"val: "<<logg[m][j].first<<" "<<logg[m][j].second<<endl;
	  cout<<"ans: "<<ans1<<" "<<ans2<<endl;
	}
	*/
	
        ans += ans2;
      }
      cout<<ans<<endl;
    }
  }
}

C++: 
#include <iostream>
#include <stdio.h>
#include <string>
#include <sstream>
#include <vector>
#include <stdlib.h>
#include <math.h>

#define timemax 1260+1
using namespace std;

int main(void){
	//FILE* fp_in = freopen("data.txt", "r", stdin);
	
	//imos法を用いる
	
	while(1) {
		int N, M, r, q;
		int v_log[] = {-1,1};
		vector<vector<int>> logchk;

		
		cin >> N >> M;
		if( N == 0 && M == 0 ) break;

		//ログイン情報取得部分
		for(int i = 0; i < M + 1; i++) {
			vector<int> newchk;
			for(int j = 0; j < timemax; j++)
				newchk.push_back(0);
			logchk.push_back(newchk);
		}


		cin >> r;

		for(int i = 0; i < r; i++) {
			int t, n, m, s;
			cin >> t >> n >> m >> s;
			logchk.at( m ).at( t ) += v_log[s];
		}

		for(int i = 0; i < M + 1; i++) 
			for(int j = 1; j < timemax; j++)
				logchk.at(i).at(j) += logchk.at(i).at( j - 1 );



		//質問処理部分
		cin >> q;
		for(int i = 0; i < q; i++) {
			int t_s, t_e, m, ans = 0;
			cin >> t_s >> t_e >> m;
			for(int j = t_s; j < t_e; j++) {
				if( logchk.at(m).at(j) ) ans ++;
			}
			cout << ans << endl;
		}
	}

	
	//while(1){}
	return 0;
}