Cod sursa(job #2621964)

Utilizator BourucLiviuBouruc Petru Liviu BourucLiviu Data 31 mai 2020 10:10:49
Problema Arbori de intervale Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.32 kb
#include <fstream>

#define N 100005

using namespace std;

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

int heap[3*N];
int x, pos;
int Max;

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

inline void DEI(int nod, int st, int dr, int a, int b)
{
    int mij;
    if(a <= st && dr <= b)
        Max = max(Max, heap[nod]);
    else
    {
        mij = (st+dr) / 2;
        if(a <= mij) DEI(nod*2, st, mij, a, b);
        if(mij+1 <= b) DEI(nod*2+1, mij+1, dr, a, b);
    }
}

int main()
{
    int n, m, p, a, b;
    fin >> n >> m;
    for(int i = 1; i <= n; ++i)
    {
        fin >> x;
        pos = i;
        actualizare(1, 1, n);
    }
    while(m--)
    {
        fin >> p >> a >> b;
        if(!p)
        {
            Max = 0;
            DEI(1, 1, n, a, b);
            fout << Max << '\n';
        }
        else
        {
            pos = a;
            x = b;
            actualizare(1, 1, n);
        }
    }
    fin.close(); fout.close();
    return 0;
}