Cod sursa(job #2375819)

Utilizator mihailrazMihail Turcan mihailraz Data 8 martie 2019 12:28:00
Problema Arbori de intervale Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.1 kb
#include <fstream>

using namespace std;
ifstream fi("arbint.in");
ofstream fo("arbint.out");
const int nmax=1e5;
int n, m;
int SGT[4*nmax+5];

void update(int nod, int st, int dr, int pos, int val)
{
    if(st==dr)
    {
        SGT[nod]=val;
        return;
    }
    int mij=(st+dr)/2;
    if(pos<=mij)
        update(2*nod, st, mij, pos, val);
    else
        update(1+2*nod, mij+1, dr, pos, val);
    SGT[nod]=max(SGT[2*nod], SGT[1+2*nod]);
}

int max_query(int nod, int st, int dr, int a, int b)
{
    if(a<=st && dr<=b)
        return SGT[nod];
    if(a>dr || b<st)
        return 0;
    int mij=(st+dr)/2;
    return max(max_query(2*nod, st, mij, a, b), max_query(1+2*nod, mij+1, dr, a, b));
}


int main()
{
    fi>>n>>m;
    for(int i=1; i<=n; i++)
    {
        int x;
        fi>>x;
        update(1, 1, n, i, x);
    }
    while(m--)
    {
        int q, a, b;
        fi>>q>>a>>b;
        if(q==0)
            fo<<max_query(1, 1, n, a, b)<<"\n";
        else
            update(1, 1, n, a, b);
    }

    fi.close();
    fo.close();
    return 0;
}