Cod sursa(job #2916237)

Utilizator mihnea.cazan15mihnea cazan mihnea.cazan15 Data 28 iulie 2022 16:00:14
Problema Range minimum query Scor 80
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.02 kb
#include <fstream>
#include <bits/stdc++.h>

using namespace std;
ifstream in("rmq.in");
ofstream out("rmq.out");
int t[400005],v[100005];
void update(int nod,int l,int r,int poz,int val)
{
    if(l==r)
        {
            t[nod]=val;
            return;
        }
    int m=(l+r)/2;
    if(poz<=m)
       update(2*nod,l,m,poz,val);
    else
        update(2*nod+1,m+1,r,poz,val);
    t[nod]=min(t[2*nod],t[2*nod+1]);
}
int query(int nod,int l,int r,int a,int b)
{
    if(a<=l && r<=b)
      return t[nod];
    int m=(l+r)/2,rl=1e9,rr=1e9;
    if(a<=m)
       rl=query(2*nod,l,m,a,b);
    if(m<b)
       rr=query(2*nod+1,m+1,r,a,b);
    return min(rl,rr);
}
int main()
{
    //ios_base::sync_with_stdio(false);
    //cin.tie(NULL);
    int n,q;
    in>>n>>q;
    memset(t,1e9,sizeof(t));
    for(int i=1;i<=n;i++)
    {
        in>>v[i];
        update(1,1,n,i,v[i]);
    }
    while(q--)
    {
        int x,y;
        in>>x>>y;
        out<<query(1,1,n,x,y)<<"\n";
    }
    return 0;
}