Cod sursa(job #2903497)

Utilizator miruna_georgescuMiruna Georgescu miruna_georgescu Data 17 mai 2022 17:14:02
Problema Range minimum query Scor 80
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.24 kb
#include <fstream>
using namespace std; 

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

int noduri[400001], valori[100001]; 

void valoareNod(int nod, int st, int dr)
{
    if (st == dr)
    {
        noduri[nod] = valori[st];
        return;
    }
    valoareNod(nod * 2, st, (st + dr) / 2);
    valoareNod(nod * 2 + 1, (st + dr) / 2 + 1, dr);
    noduri[nod] = min(noduri[2 * nod], noduri[2 * nod + 1]);
}

int valMinima(int indiceNod, int st, int dr, int val1, int val2)
{
    if (val2 < st || dr < val1) return 100004;
    if (val1 <= st && dr <= val2) return noduri[indiceNod];
   
    int valMinSt = 100004, valMinDr = 100004, mij = (st+dr)/2;
    if (val1 <= mij) 
        valMinSt = valMinima(indiceNod * 2, st, mij, val1, val2); 
    if (val2 > mij)
        valMinDr = valMinima(indiceNod * 2 + 1, mij + 1, dr, val1, val2);
    return min(valMinSt, valMinDr); 


}

int main()
{
    int nrElemente, nrIntrebari; 
    fin >> nrElemente >> nrIntrebari; 

    for (int i = 1; i <= nrElemente; i++)
        fin >> valori[i]; 
    valoareNod(1, 1, nrElemente);

    for (int i = 1; i <= nrIntrebari; i++)
    {
        int x, y; fin >> x >> y; 
        fout << valMinima(1, 1, nrElemente, x, y) << '\n';
    }
}