Cod sursa(job #3135537)

Utilizator Nicoleta114Caramaliu Nicoleta Nicoleta114 Data 3 iunie 2023 16:56:51
Problema Range minimum query Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.18 kb
#include <iostream>
#include <vector>
#include <cmath>
using namespace std;

vector<vector<int>> construiesteTabelaRara(const vector<int>& arr) {
    int n = arr.size();
    int log_n = log2(n) + 1;

    vector<vector<int>> tabelaRara(n, vector<int>(log_n));

    for (int i = 0; i < n; i++) {
        tabelaRara[i][0] = arr[i];
    }

    for (int j = 1; (1 << j) <= n; j++) {
        for (int i = 0; i + (1 << j) <= n; i++) {
            tabelaRara[i][j] = min(tabelaRara[i][j - 1], tabelaRara[i + (1 << (j - 1))][j - 1]);
        }
    }

    return tabelaRara;
}

int interogare(const vector<vector<int>>& tabelaRara, int stanga, int dreapta) {
    int k = log2(dreapta - stanga + 1);
    return min(tabelaRara[stanga][k], tabelaRara[dreapta - (1 << k) + 1][k]);
}

int main() {
    int N, M;
    cin >> N >> M;

    vector<int> vectorul(N);
    for (int i = 0; i < N; i++) {
        cin >> vectorul[i];
    }

    vector<vector<int>> tabelaRara = construiesteTabelaRara(vectorul);

    while (M--) {
        int x, y;
        cin >> x >> y;
        int rezultat = interogare(tabelaRara, x - 1, y - 1);
        cout << rezultat << endl;
    }

    return 0;
}