#include "wall.h"
#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
using namespace std;

//#define int long long
#define fi first
#define se second
#define pb push_back
#define mp make_pair

typedef pair<int, int> ii;
typedef pair<ii, int> iii;
typedef pair<ii, ii> iiii;

const int N = 2e6 + 5;

const int oo = 1e9 + 7, mod = 1e9 + 7;

mt19937 rng(1);

int rnd(int l, int r){
	int temp = rng() % (r - l + 1);
	return abs(temp) + l;
}

int n, q;

struct it{
	// lst1 = last max operation, lst2 = last min operation, which = which type?
	int lst1, lst2;// which;
	it(){
		lst1 = -oo, lst2 = oo;// which = -1;
	}
	it(int _a, int _b){
		lst1 = _a, lst2 = _b;
	}
}IT[N << 2];

it merge(it x, it y){
	it z;
	assert(x.lst1 <= x.lst2);
	assert(y.lst1 <= y.lst2);
	ii temp = {x.lst1, x.lst2};
	if(y.lst1 >= x.lst2){
		temp = {y.lst1, y.lst1};
	}
	else temp = {max(x.lst1, y.lst1), temp.se};
	if(y.lst2 <= temp.fi) temp = {y.lst2, y.lst2};
	else temp = {temp.fi, min(temp.se, y.lst2)};
	z.lst1 = temp.fi, z.lst2 = temp.se;
	return z;
}

void upd(int id, int l, int r, int pos, ii para){
	if(l == r){
		if(para.fi == 0){
			IT[id].lst1 = para.se;
	//		IT[id].which = 0;
		}
		else if(para.fi == 1){
			IT[id].lst2 = para.se;
	//		IT[id].which = 1;
		}
		else{// cook
			IT[id].lst1 = -oo, IT[id].lst2 = oo; //IT[id].which = -1;
		}
		return;
	}
	int mid = (l + r) >> 1;
	if(pos <= mid) upd(id << 1, l, mid, pos, para);
	else upd(id << 1 | 1, mid + 1, r, pos, para);
	IT[id] = merge(IT[id << 1], IT[id << 1 | 1]);
}

vector<ii> updates[N];

void buildWall(int N, int K, int op[], int left[], int right[], int height[], int finalHeight[]){
	n = N, q = K;
	for(int i = 0; i < q; i++){
		cout << "OK " << left[i] << " " << right[i] << "\n";
		updates[left[i]].pb({i, 1});
		updates[right[i] + 1].pb({i, -1});
	}
	for(int i = 0; i < n; i++){
		for(auto it : updates[i]){
		//	cout << "HEHE " << it.fi << " " << it.se << " " << i << "\n";
			if(it.se == 1){
				upd(1, 0, q - 1, it.fi, {op[it.fi] - 1, height[it.fi]});
			}
			else{
				upd(1, 0, q - 1, it.fi, {-1, -oo});
			}
		}
		it a = {0, 0}, b = IT[1];
		finalHeight[i] = merge(a, b).lst1;
		cout << finalHeight[i] << " ";
	}	
//	cout << "\n";
}

// local part, when submit just erase the #define local line
//#define local
#ifdef local
void process(){
	int n, k, op[10005], left[10005], right[10005], height[10005], finalheight[10005];
	cin >> n >> k;
	for(int i = 0; i < k; i++) cin >> op[i] >> left[i] >> right[i] >> height[i];
	buildWall(n, k, op, left, right, height, finalheight);
}

signed main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	process();
}
#endif