Cod sursa(job #3217161)

Utilizator amalia_ghicaAmalia Ghica amalia_ghica Data 21 martie 2024 16:00:24
Problema Range minimum query Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.91 kb
#include <fstream>
#include <bits/stdc++.h>
using namespace std;
///calin+popy
int sp[100005][100005];
int lg[100005], v[100005];
void buildSparseTable(int arr[], int n)
{
    for (int i=0;i<n;i++)
        sp[i][0]=arr[i];

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

int query(int i, int j)
{
    int len=j-i+1;
    int k=lg[j-i+1], nr=(1<<k);
    return min(sp[i][k],sp[i+len-nr][k]);
}


int main()
{
    ifstream cin("rmq.in");
    ofstream cout("rmq.out");
    for(int i=2; i<=100005; i++)
        lg[i] = 1 + lg[i/2];

    int n,m, x, y;
    cin >> n >> m;
    for(int i=1;i<=n;i++)
    {
        cin >> v[i];
    }
    for(int i=1;i<=m;i++)
    {
        cin >> x>>y;
        cout<<query(x, y)<<'\n';
    }
    return 0;
}