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;

struct D{
  int t,s;
};

vector<vector<D>> data;
void init(){
  data.clear();
}
int q;
void print(){
  for(int i=0;i<data.size();i++){
    //cerr<<"m="<<i<<":";
    for(int j=0;j+1<data[i].size();j+=2){
      //cerr<<"("<<data[i][j].t<<"-"<<data[i][j+1].t<<")";
    }//cerr<<endl;
  }
}
bool input(){
  int n,m;
  cin>>n>>m;
  if(n==0&&m==0)return false;
  //cerr<<"input"<<endl;
  int r;
  cin>>r;
  data.resize(m+10);
  vector<int> login(m+10,0);
  for(int i=0;i<r;i++){
    int t,n,m,s;
    cin>>t>>n>>m>>s;
    if(s==1){
      login[m]++;
    }else{
      login[m]--;
    }
    //cerr<<login[m]<<" "<<s<<endl;
    if(login[m]==s){
      data[m].push_back(D{t,s});
    }else if(data[m].size()>0&&data[m][data[m].size()-1].s==0){
      int pre_t = data[m][data[m].size()-1].t;
      data[m][data[m].size()-1].t = max(pre_t,t);
    }
  }
  cin>>q;
  return true;
}
int solve(){
  int s,e,m;
  cin>>s>>e>>m;
  //cerr<<"solve::"<<s<<" "<<e<<" "<<m<<endl;
  const vector<D> l = data[m];
  int ans = 0;
  for(int i=0;i<(int)l.size()-1;i++){
    if(l[i].s==1&&(s<l[i+1].t)&&l[i].t<=e){
      ans += l[i+1].t - max(s,l[i].t);
      if(e<=l[i+1].t){
        ans -= l[i+1].t - e;
      }
    }
  }
  return ans;
}

int main(){
  while(init(),input()){
    print();
    for(int i=0;i<q;i++){
      int ans = solve();
      //cerr<<"ans::"<<ans<<endl;
      cout<<ans<<endl;
    }
  }
}

C++: #include <iostream>
#include <vector>
#include <algorithm>
#include <map>
#define INF 1 << 28
#define MAX_DATA 1 << 17
using namespace std;

typedef pair<int,int> P;

template <class T>
class SegmentTree
{
private :
    int n;
    vector<T> data;
public :
    void init(int);
    void update(int, int);
    int query(int, int, int, int, int);
    int size();
    T top();
};

template <class T>
void SegmentTree<T>::init (int n_) {
    n = 1;
    while (n < n_ + 1) n *= 2;
    data.resize(n * 2);
    for (int i = 0; i < data.size(); i++) data[i] = 0;
}

template <class T>
void SegmentTree<T>::update (int k_, int l_) {
    for (int i = k_; i <= 1260 - 540 && i < l_; i++) {
        int tmp_ = i + n - 1;
        data[tmp_] = 1;
        while (tmp_) {
            tmp_ = (tmp_ - 1) / 2;
            data[tmp_] = data[tmp_ * 2 + 1] + data[tmp_ * 2 + 2];
        }
    }
}

template <class T>
int SegmentTree<T>::query (int a_, int b_, int k_, int l_, int r_) {
    if (r_ <= a_ || b_ <= l_) return 0;

    if (a_ <= l_ && r_ <= b_) {
        return data[k_];
    }
    else {
        T vl = query(a_, b_, k_ * 2 + 1, l_, (l_ + r_) / 2);
        T vr = query(a_, b_, k_ * 2 + 2, (l_ + r_) / 2, r_);

        return (vl + vr);
    }
}

template <class T>
int SegmentTree<T>::size () {
    return n;
}

template <class T>
T SegmentTree<T>::top () {
    return data[0];
}

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

        vector<SegmentTree<unsigned short> > p(M + 1);
        for (int i = 0; i < p.size(); i++) {
            p[i].init(1260 - 540);
        }
        map<P,int> dat;
        for (int i = 0; i < R; i++) {
            unsigned short t, n, m, s;
            cin >> t >> n >> m >> s;

            t -= 540;
            if (s) {
                dat[P(n,m)] = t;
            } else {
                int tmp = dat[P(n,m)];
                auto ite = dat.find(P(n,m));
                dat.erase(ite);
                p[m].update(tmp, t);
            }
        }

        for (auto i : dat) {
            p[i.first.second].update(i.second, INF);
        }

        int Q;
        cin >> Q;
        for (int i = 0; i < Q; i++) {
            unsigned short ts, te, m;
            cin >> ts >> te >> m;
            ts -= 540;
            te -= 540;
            cout << p[m].query(ts, te, 0, 0, p[m].size()) << endl;
        }
    }



    return 0;
}

C++: #include <iostream>
#include <stdio.h>
#include <ctype.h>
#include <vector>
#include <string>
#include <algorithm>
using namespace std;


int main (){
  
  int pc,stu;
  
  while(1){

    cin >>pc>>stu;
    if (pc==0&&stu==0)break;
    
    int i,j,k,srec,sque,t,n,m,s,ts,te,sum;
    int record[pc][721];
    
    for(i=0;i<pc;i++){
      for(j=0;j<721;j++){
	record[i][j]=0;
      }
    }

    //record入力
    cin >>srec;
    for(i=0;i<srec;i++){
      cin >>t>>n>>m>>s;
      
      if (s==1){
	//ログイン
	for(j=t-540;j<721;j++){
	  record[n][j] = m;
	}
      }else{
	//ログアウト
	for(j=t+1-540;j<721;j++){
	  record[n][j] = 0;
	}
      }
    }
    
    //記録チェック
    cin >> sque;
    for(i=0;i<sque;i++){
      sum = 0;
      cin >> ts >>te >>m;
      for(j=ts-540;j<te+1-540;j++){
	for(k=0;k<pc;k++){
	  if (record[k][j]==m){
	    sum += 1;
	    break;
	  }
	}
      }
      cout << sum <<endl;
    }

  }
    
  return 0;
}