Cod sursa(job #1029362)

Utilizator dumitrualexAlex Dumitru dumitrualex Data 15 noiembrie 2013 14:05:16
Problema Arbori de intervale Scor 40
Compilator cpp Status done
Runda Arhiva educationala Marime 1.31 kb
#include <fstream>
#include <algorithm>
#define FOR(i, a, b) for(int i = (a); i <= (b); i++)
#define nmax 100000+5
using namespace std;

ifstream fin("arbint.in");
ofstream fout("arbint.out");

int heap[2*nmax];
int n, m;

void actualizare(int nod, int st, int dr, int poz, int x)
{
    int mijl = (st + dr)/2;
    if (st == dr)
        heap[nod] = x;
    else
    {
        if (poz <= mijl)
            actualizare(2*nod, st, mijl, poz, x);
        else
            actualizare(2*nod+1, mijl+1, dr, poz, x);
        heap[nod] = max(heap[2*nod], heap[2*nod+1]);
    }
}

int interogare(int nod, int st, int dr, int a, int b)
{
    int mijl = (st + dr)/2;
    if (a <= st && dr <= b)
        return heap[nod];
    else
    {
        int x = 0, y = 0;
        if (a <= mijl)
            x = interogare(2*nod, st, mijl, a, b);
        if (b >= mijl+1)
            y = interogare(2*nod+1, mijl+1, dr, a, b);
        return max(x, y);
    }
}
int main()
{
    int x, op, a, b;
    fin >> n >> m;
    FOR(i, 1, n)
    {
        fin >> x;
        actualizare(1, 1, n, i, x);
    }
    FOR(i, 1, m)
    {
        fin >> op >> a >> b;
        if (op == 0)
            fout << interogare(1, 1, n, a, b) << '\n';
        else
            actualizare(1, 1, n, a, b);
    }
    return 0;
}