Cod sursa(job #3365605)

Utilizator eva2025Eva Vasilescu eva2025 Data 22 septembrie 2026 18:07:33
Problema Cautare binara Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.27 kb
#include <iostream>
#include <fstream>

using namespace std;
ifstream fin("cautbin.in");
ofstream fout("cautbin.out");
int v[100002];
int cautare_b(int n,int x,int v[])
{
    int st=1,dr=n,r=-1;
    while(st<=dr)
    {
        int m=(st+dr)/2;
        if(v[m]==x)
        {
            r=m;
            st=m+1;
        }
        else if(v[m]>x)
        {
            dr=m-1;
        }
        else st=m+1;
    }
    return r;
}
int cautare_b1(int n,int x,int v[])
{
    int st=1,dr=n,r=-1;
    while(st<=dr)
    {
        int m=(st+dr)/2;
        if(v[m]<=x)
        {
            r=m;
            st=m+1;
        }
        else dr=m-1;
    }
    return r;
}
int cautare_b2(int n,int x,int v[])
{
    int st=1,dr=n,r=-1;
    while(st<=dr){
        int m=(st+dr)/2;
        if(v[m]>=x){
            r=m;
            dr=m-1;
        }else st=m+1;
    }
    return r;
}
int main()
{
    int n,m,x,t;
    fin>>n;
    for(int i=1; i<=n; i++)
    {
        fin>>v[i];
    }
    fin>>m;
    for(int i=1; i<=m; i++)
    {
        fin>>t>>x;
        if(t==0){
            fout<<cautare_b(n,x,v)<<endl;
        }else if(t==1){
            fout<<cautare_b1(n,x,v)<<endl;
        }else fout<<cautare_b2(n,x,v)<<endl;
    }
    return 0;
}