Cod sursa(job #3194323)

Utilizator varena2005Tudor Andrei varena2005 Data 17 ianuarie 2024 17:53:12
Problema Cautare binara Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.11 kb
#include <iostream>
#include <string.h>
#include <fstream>

using namespace std;

ifstream in("cautbin.in");
ofstream out("cautbin.out");

int n, m, v[100001], w[100001];

int lower_bound(int x)
{
    int st=1, dr=n;
    int aux;
    while(st<=dr)
    {
        int mij=(st+dr)/2;
        if(v[mij]<=x)
        {
            aux=mij;
            st=mij+1;
        }
        else dr=mij-1;
    }
    return aux;
}

int upper_bound(int x)
{
    int st=1, dr=n;
    int aux;
    while(st<=dr){
        int mij=(st+dr)/2;
        if(v[mij]>=x)
        {
            aux=mij;
            dr=mij-1;
        }
        else
            st=mij+1;
    }

}

int main()
{
    in>>n;
    for(int i=1; i<=n; i++)
        in>>v[i];
    in>>m;
    for(int i=1; i<=m; i++)
    {
        int a, b;
        in>>a>>b;
        if(a==1) w[i]=lower_bound(b);
        else if(a==2) w[i]=upper_bound(b);
        else{
            int x=lower_bound(b);
            if(v[x]!=b) w[i]=-1;
            else w[i]=x;
        }
    }
    for(int i=1; i<=m; i++)
        out<<w[i]<<"\n";

    return 0;
}