Cod sursa(job #2645127)

Utilizator FilipCuciucFilip Cuciuc FilipCuciuc Data 27 august 2020 11:27:39
Problema Arbori de intervale Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.7 kb
//
//  main.cpp
//  C++ - teste
//
//  Created by Filip Cuciuc on 03/02/2020.
//  Copyright © 2020 Filip Cuciuc. All rights reserved.
//

//#include <iostream>
#include <stdio.h>
#include <fstream>
#include <algorithm>
#include <vector>
#include <queue>
#include <math.h>
#include <map>
#include <string>
#include <cctype>
#include <iomanip>
//#include "MED.h"
using namespace std;
//using namespace std::chrono;

ifstream cin("arbint.in");
ofstream cout("arbint.out");

const int MAXN = 1e5 + 10;
int n, m;
int v[MAXN], tree[4 * MAXN];

void update(int nod, int s, int d, int poz, int val) {
    if (s == d){
      tree[nod] = val;
      return;
    }
    int mij = s + d;
    mij /= 2;
    if (poz <= mij){
        update (nod * 2 , s , mij , poz , val);
    }
    else{
        update (nod * 2 + 1 , mij + 1 , d , poz , val);
    }
    tree[nod] = max(tree[nod * 2] , tree[nod * 2 + 1]);

}

int query (int nod , int s , int d , int S , int D){
    if (s >= S && d <= D){
        return tree[nod];
    }
    int mij = s + d;
    mij /= 2;
 
    int MAX = 0;
    if (S <= mij){
        MAX = max(MAX , query (nod * 2 , s , mij , S , D));
    }
    if (mij < D){
        MAX = max(MAX , query (nod * 2 + 1 , mij + 1 , d , S , D));
    }
    return MAX;
}

void read() {
    cin >> n >> m;
    for (int i = 1; i <= n; i++) {
        cin >> v[i];
        update (1 , 1 , n , i , v[i]);
    }
    cout << endl;
}


void solve() {
    read();
    for (int i = 1; i <= m; i++){
        int op , a , b;
        cin >> op >> a >> b;
        if (op == 1){
            update (1 , 1 , n , a , b);
        }
        else{
            cout << query(1 , 1 , n , a , b) << '\n';
        }
    }
}
 
int main() {
    
    solve();
 
    return 0;
}