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>
using namespace std;

int main(){
while(1){//start


	int N, M, r;
	//N；PC数　M；学生数
	cin >> N >> M;
	if(N == 0 and M == 0) break;
	cin >> r;


	//学生数、　時間
	int data[1004][721];
	for(int j = 0; j < 1004; j++){
		for(int k = 0; k < 721; k++) data[j][k] = 0;
	}


	for(int i = 0; i < r; i++){
		// t；時刻、　n;PC番号　m；学生番号　s；１ならログイン、０ならログアウト(配列中では逆)
		int t, n, m;
		bool s;
		cin >> t >> n >> m >> s;
		if(s) data[m][t - 539] += 1;
		else data[m][t - 539] += -1;
	}

	//累積和をとる
	for(int i = 0; i <= M; i++){
		for(int k = 1; k < 721; k++) data[i][k] = data[i][k] + data[i][k - 1];
	}


	//クエリを取得
	int qn;
	cin >> qn;
	for(int i = 0; i < qn; i++){
		int ts, tt, sn;
		cin >> ts >> tt >> sn;

		//学生について調査する
		int ans = 0;
		for(int j = ts - 539; j < tt - 539; j++){
			if(data[sn][j]) ans++;
		}
		cout << ans << endl;
	}
	
}//end	
	
	return 0;
}

C++: #include <iostream>
using namespace std;

int main(){
	int n,m,r,q;
	static int cnt[1000][1261];
	while(cin >> n >> m,n){
		for(int i = 0;i < m;i++){
			for(int j = 0;j <= 1260;j++) cnt[i][j] = 0;
		}
		cin >> r;
		for(int i = 0;i < r;i++){
			int t,a,b,s;
			cin >> t >> a >> b >> s; b--;
			if(s) cnt[b][t]++;
			else cnt[b][t]--;
		}
		for(int i = 0;i < m;i++){
			for(int j = 1;j <= 1260;j++){
				cnt[i][j] += cnt[i][j - 1];
				//if(j >= 774 && j <= 881) cout << cnt[i][j] << " ";
			}
			//cout << endl;
		}
		for(int i = 0;i < m;i++){
			for(int j = 1;j <= 1260;j++){
				if(cnt[i][j]) cnt[i][j] = 1;
			}
		}
		for(int i = 0;i < m;i++){
			for(int j = 1;j <= 1260;j++){
				cnt[i][j] += cnt[i][j - 1];
			}
		}
		cin >> q;
		for(int i = 0;i < q;i++){
			int s,t,b;
			cin >> s >> t >> b; b--;
			cout << cnt[b][t - 1] - cnt[b][s - 1] << endl;
		}
	}
	return 0;
}

C++: // 2007B.cpp : コンソール アプリケーションのエントリ ポイントを定義します。
//

#include "stdafx.h"
#include <iostream>
#include <algorithm>
#define R 1001
using namespace std;

int main()
{
	int N, M;
	while (cin >> N >> M, N || M){

		//rの入力
		int r, t[R], n[R], m[R], s[R], q, ts, te, qm;
		fill(t, t + R, 0);
		fill(n, n + R, 0);
		fill(m, m + R, 0);
		fill(s, s + R, 0);

		cin >> r;
		for (int i = 0; i < r; i++){
			cin >> t[i] >> n[i] >> m[i] >> s[i];
		}
		cin >> q;

		//qの入力と計算
		for (int c = 0; c < q; c++){
			cin >> ts >> te >> qm;

			//記録
			int tm[1300];
			int pc[1300];
			fill(tm, tm + 1300, 0);
			fill(pc, pc + 1300, 0);
			for (int i = 0; i < r; i++){
				if (m[i] == qm){
					if (s[i] == 1){
						pc[n[i]] = t[i];
					}
					if (s[i] == 0){
						for (int j = pc[n[i]]; j < t[i]; j++){
							tm[j] = 1;
						}
					}
				}
			}

			//カウント
			//bool login = false;
			int counter = 0;
			//int temp;
			for (int i = ts; i < te; i++){
				counter += tm[i];
				
				/*
				if (tm[i] == 1 && login == false){
					temp = i;
					login = true;
				} 
				if (tm[i] == 0 && login == true){
					counter += i - 1 - temp;
					login = false;
				}
				*/
			//	cout << "i:" << i << " tm[i]:" << tm[i] << " login:" << login << " temp:" << temp << endl;
			}
			/*
			if (login == true){
				counter += te - temp;
			}
			*/
			cout << counter << 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;


}