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 <iomanip>
#include <cstdio>
#include <string>
#include <cstring>
#include <deque>
#include <list>
#include <queue>
#include <stack>
#include <vector>
#include <utility>
#include <algorithm>
#include <map>
#include <set>
#include <complex>
#include <cmath>
#include <limits>
#include <climits>
#include <ctime>
#include <cassert>
using namespace std;

#define rep(i,a,n) for(int (i)=(a); (i)<(n); (i)++)
#define repq(i,a,n) for(int (i)=(a); (i)<=(n); (i)++)
#define repr(i,a,n) for(int (i)=(a); (i)>=(n); (i)--)
#define all(v) begin(v), end(v)
#define pb(a) push_back(a)
#define fr first
#define sc second
#define INF 2000000000
#define int long long int

#define X real()
#define Y imag()
#define EPS (1e-10)
#define EQ(a,b) (abs((a) - (b)) < EPS)
#define EQV(a,b) ( EQ((a).X, (b).X) && EQ((a).Y, (b).Y) )
#define LE(n, m) ((n) < (m) + EPS)
#define LEQ(n, m) ((n) <= (m) + EPS)
#define GE(n, m) ((n) + EPS > (m))
#define GEQ(n, m) ((n) + EPS >= (m))

typedef vector<int> VI;
typedef vector<VI> MAT;
typedef pair<int, int> pii;
typedef long long ll;

typedef complex<double> P;
typedef pair<P, P> L;
typedef pair<P, double> C;

int dy[]={0, 0, 1, -1};
int dx[]={1, -1, 0, 0};
int const MOD = 1000000007;

namespace std {
    bool operator<(const P& a, const P& b) {
        return a.X != b.X ? a.X < b.X : a.Y < b.Y;
    }
}

int calc(int s, int e, int ts, int te) {
    int x = min(e, te) - max(s, ts);
    if(x < 0) x = 0; return x;
}

signed main() {
    int N, M;
    while(cin >> N >> M, N || M) {
        int logs[10010][1010] = {};
        vector<pii> v[10010];
        int r, t, n, m, s; cin >> r;
        rep(i,0,r) {
            cin >> t >> n >> m >> s;
            t -= 539;
            m--;
            if(s == 0) v[m].pb(pii(logs[m][n], t));
            else logs[m][n] = t;
        }

        int q; cin >> q;
        rep(i,0,q) {
            int ts, te, mm; cin >> ts >> te >> mm;
            ts -= 539; te -= 539;
            mm--;

            int ruiseki[1000] = {};
            rep(j,0,v[mm].size()) {
                ruiseki[ v[mm][j].fr     ]++;
                ruiseki[ v[mm][j].sc + 1 ]--;
            }
            int ans = 0;
            rep(j,1,1000) {
                ruiseki[j] += ruiseki[j-1];
                if(ruiseki[j] && ruiseki[j-1] && ts < j && j <= te) ans++;
            }
            cout << ans << endl;
        }
    }
    return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
using vi=vector<int>;
using vvi=vector<vi>;
using vs=vector<string>;
using msi=map<string,int>;
using mii=map<int,int>;
using pii=pair<int,int>;
using vlai=valarray<int>;
using ll=long long;
#define rep(i,n) for(int i=0;i<n;i++)
#define rrep(i,n) for(int i=n-1;i>=0;i--)
#define range(i,s,n) for(int i=s;i<n;i++)
#define all(a) a.begin(),a.end()
#define rall(a) a.rbegin(),a.rend()
#define fs first
#define sc second

int main(){
    int n,m;
    while(cin>>n>>m,n){
        int r,q;
        cin>>r;
        map<int,vi> user;
        rep(i,r){
            int a,b,c,d; cin>>a>>b>>c>>d;
            if(user.find(c)==user.end()){
                user[c]=vi(721,0);
            }
            if(d==1){
                user[c][a-540]++;
            }else{
                user[c][a-540]--;
            }
        }
        for(auto &p : user)partial_sum(all(p.sc),p.sc.begin());
        cin>>q;
        rep(i,q){
            int a,b,c,d=0; cin>>a>>b>>c;
            a-=540,b-=540;
            if(user.find(c)!=user.end()){
                range(j,a,b){
                    d+=user[c][j]?1:0;
                }
            }
            cout<<d<<endl;
        }
    }
}

C++: #include<bits/stdc++.h>
#define fi first
#define se second
using namespace std;
vector<pair<int,int> > v[10001];
int vv[10001][1000];

int main(){
  int n,m;
  while(cin>>n>>m,n){
    int r,q;cin>>r;
    vector<pair<int,int> > v[10001];
    for(int i=0;i<r;i++){
      int a,b,c,d;cin>>a>>b>>c>>d;
      c--;
      a-=540;
      if(d==0){
        v[c].push_back({b,a});
      }else{
        v[c].push_back({b,a});
      }
    }
    for(int i=0;i<m;i++){
      for(int j=0;j<800;j++){
        vv[i][j]=0;
      }
    }
    for(int i=0;i<m;i++){
      sort(v[i].begin(),v[i].end());
      for(int j=0;j<(int)v[i].size();j+=2){
        vv[i][v[i][j].se]++;
        vv[i][v[i][j+1].se]--;
      }
    }
    for(int i=0;i<m;i++){
      for(int j=0;j<800;j++){
        if(j==0)continue;
        vv[i][j]=vv[i][j-1]+vv[i][j];
      }
    }
    cin>>q;
    for(int i=0;i<q;i++){
      int ts,te,tm;cin>>ts>>te>>tm;
      tm--;
      ts-=540;
      te-=540;
      int res=0;
      for(int j=ts;j<te;j++){
        if(vv[tm][j]>0)res++;
      }
      cout<<res<<endl;
    }
  }
  return 0;
}