Go: package main

import (
	"bufio"
	"fmt"
	"os"
	"sort"
	"strconv"
	"strings"
)

func main() {
	io := NewIo()
	defer io.Flush()
	for {
		M, T, P, R := io.NextInt(), io.NextInt(), io.NextInt(), io.NextInt()
		if M == 0 {
			break
		}
		score := make([]struct{ num, time, index int }, T)
		submit := make([][]int, T)
		for i := 0; i < T; i++ {
			score[i].index = i + 1
			submit[i] = make([]int, P)
		}

		for i := 0; i < R; i++ {
			m, t, p, j := io.NextInt(), io.NextInt()-1, io.NextInt()-1, io.NextInt()
			if j == 0 {
				score[t].num++
				score[t].time += submit[t][p]*20 + m
			} else {
				submit[t][p]++
			}
		}
		sort.SliceStable(score, func(i, j int) bool {
			return score[i].num < score[j].num || score[i].num == score[j].num && score[i].time > score[j].time
		})

		for i := T - 1; i > 0; i-- {
			io.Printf("%d", score[i].index)
			if score[i].num == score[i-1].num && score[i].time == score[i-1].time {
				io.Printf("=")
			} else {
				io.Printf(",")
			}
		}
		io.Println(score[0].index)
	}
}

// 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;
typedef pair<int, int> P;
typedef pair<int, pair<int, int>> S;
int wa[51][11];
int OK[11];
vector<S> v;

//比較関数
bool comp(S lhs, S rhs){
	if(lhs.first != rhs.first){
		return lhs.first < rhs.first;
	}
	if(lhs.second.first != rhs.second.first){
		return lhs.second.first > rhs.second.first;
	}
	if(lhs.second.second != rhs.second.second){
		return lhs.second.second < rhs.second.second;
	}
}

int main(){
while(1){//start
	
	int M, T, P, R;
	cin >> M >> T >> P >> R;
	if(M == 0 and T == 0 and P == 0 and R == 0) break;

	//初期化
	v.resize(T);
	for(int i = 0; i < T; i++){
		v[i].first = 0;
		v[i].second.first = 0;
		v[i].second.second = 0;
	}
	for(int i = 0; i < 51; i++){
		for(int j = 0; j < 11; j++) wa[i][j] = 0;
	}
	for(int i = 0; i < 11; i ++) OK[i] = 0;
	
	
	//データを格納
	for(int i = 0; i < R; i++){
		int m, t, p, j;
		cin >> m >> t >> p >> j;

		if(j == 0){
			v[t - 1].second.first += m + 20*wa[t][p]; 
			OK[t-1] += 1;
		}
		else{
			wa[t][p] += 1;
		}
	}
	
	//vectorにデータを入れる
	for(int i = 1; i <= T; i++){
		//v.push_back(make_pair(OK[i-1], make_pair(sum_m, i)));
		v[i-1].first = OK[i-1];
		v[i-1].second.second = i;
	}
	
	sort(v.begin(), v.end(), comp);
	reverse(v.begin(), v.end());
	
	//for(int i = 0; i < (int)v.size(); i++) cout << v[i].first << " " << v[i].second.first << " " << v[i].second.second << endl;
	
	
	//出力
	for(int i = 1; i <= (int)v.size(); i++){
		cout << v[i-1].second.second;
		if(i == (int)v.size()) continue;
		else if(v[i-1].first == v[i].first and v[i-1].second.first == v[i].second.first) cout << "=";
		else cout << ",";
	}
	cout << endl;
	//v.clear();
}//end	
	return 0;
}

C++: #include<iostream>
#include<cstdio>
#include<string>
#include<queue>
#include<stack>
#include<cstdlib>
#include<algorithm>
#include<cmath>

#define rep(n,cnt) for(int cnt=0;cnt<n;++cnt)

using namespace std;

template <typename TYPE>
void printArray(TYPE* array, int size){
  rep(size,i) cout << array[i] << "\t" << flush;
  cout << endl;
}

int StringToInt(string str){
  return atoi(str.c_str());
}

double factorial(double n){
  double sum=1;
  for(int i=n;i>=1;i--){
    sum = i*sum;
  }
  return sum;
}

double combination(double n, double k){
  double denominator = 1;
  for(int i=n,j=0;j<k;j++,i--) denominator*=i;
  return denominator/factorial(k);
}

#define MAX_M 300
#define MAX_T 50
#define MAX_P 10
#define MAX_R 2000

class Team{
public:
    int num;
    int collect;
    int time;
    int wa[MAX_P];
};

int M,T,P,R;
int m[MAX_R],t[MAX_R],p[MAX_R],j[MAX_R];
Team team[MAX_T];

int main(){
    while(1){
	cin >> M;
	cin >> T;
	cin >> P;
	cin >> R;
	if(M == 0 && T == 0 && P == 0 && R == 0) return 0;	
        
	rep(T,i){
	    team[i].num = i+1;
	    team[i].collect = 0;
            team[i].time = 0;
	    rep(5,j){
		team[i].wa[j] = 0;
	    }
	}

	rep(R,i){
            cin >> m[i];
	    cin >> t[i];
	    cin >> p[i];
	    cin >> j[i];
	}	
        
	rep(R,i){
            if(j[i] == 0){
		team[t[i]-1].collect++;
		team[t[i]-1].time += m[i] + team[t[i]-1].wa[p[i]-1];
	    }
	    else{
		team[t[i]-1].wa[p[i]-1] += 20;
	    }
	}

        for(int i=0;i<T;i++){
	    for(int j=T-1;j>=i;j--){
		if(team[i].num < team[j].num){
		    Team buf = team[i];
                    team[i] = team[j];
		    team[j] = buf;
		}
	    }
	}

	for(int i=0;i<T;i++){
	    for(int j=T-1;j>=i;j--){
		if(team[i].collect < team[j].collect){
		    Team buf = team[i];
                    team[i] = team[j];
		    team[j] = buf;
		}
	    }
	}

	for(int i=0;i<T;i++){
	    for(int j=T-1;j>=i;j--){
		if(team[i].collect == team[j].collect && team[i].time > team[j].time){
		    Team buf = team[i];
                    team[i] = team[j];
		    team[j] = buf;
		}
	    }
	}

	for(int i=0;i<T;i++){
	    for(int j=T-1;j>=i;j--){
		if(team[i].time == team[j].time && team[i].collect == team[j].collect && team[i].num < team[j].num){
		    Team buf = team[i];
                    team[i] = team[j];
		    team[j] = buf;
		}
	    }
	}

	cout << team[0].num;
	for(int i=1;i<T;i++){
            if(team[i].collect == team[i-1].collect && team[i].time == team[i-1].time){
		cout << "=" << team[i].num;
	    }
	    else{
                cout << "," << team[i].num;
	    }
	}
	cout << endl;
    }
}