Cod sursa(job #2740927)

Utilizator Uriesu_IuliusUriesu Iulius Uriesu_Iulius Data 14 aprilie 2021 19:44:59
Problema Cautare binara Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.32 kb
#include <bits/stdc++.h>

using namespace std;

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

int n, m;
int v[100001];

int query0(int x)
{
    int p=-1;
    int st=1, dr=n;
    while(st<=dr)
    {
        int mij=(st+dr)/2;
        if(v[mij]==x)
        {
            p=mij;
            st=mij+1;
        }
        else if(v[mij]<x)
            st=mij+1;
        else
            dr=mij-1;
    }
    return p;
}

int query1(int x)
{
    int p;
    int st=1, dr=n;
    while(st<=dr)
    {
        int mij=(st+dr)/2;
        if(v[mij]<=x)
        {
            p=mij;
            st=mij+1;
        }
        else
            dr=mij-1;
    }
    return p;
}

int query2(int x)
{
    int p;
    int st=1, dr=n;
    while(st<=dr)
    {
        int mij=(st+dr)/2;
        if(v[mij]>=x)
        {
            p=mij;
            dr=mij-1;
        }
        else
            st=mij+1;
    }
    return p;
}

int main()
{
    int i, op, x;
    fin >> n;
    for(i=1; i<=n; i++)
        fin >> v[i];
    fin >> m;
    for(i=1; i<=m; i++)
    {
        fin >> op >> x;
        if(op==0)
            fout << query0(x);
        else if(op==1)
            fout << query1(x);
        else
            fout << query2(x);
        fout << '\n';
    }
    return 0;
}