Cod sursa(job #1802550)

Utilizator alex.kosnean97Cosnean Alexandru alex.kosnean97 Data 10 noiembrie 2016 14:46:17
Problema Cautare binara Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 1.45 kb
#include <fstream>
#include<cmath>
using namespace std;
 
int main()
{
    ifstream cin("cautbin.in");
    ofstream cout("cautbin.out");
 
    int n;
    cin >> n;
    int *v;
    v=new int [n];
    for(int i=1; i<=n; i++) cin >> v[i];
    int m;
    cin >> m;
    for(int i=1; i<=m; i++)
    {
        int a, x;
        cin >> a >> x;
 
        if(a==1)
        {
            int mid, lo=1, hi=n;
             while(lo<=hi)
            {
                mid=lo+(hi-lo)/2;
                if(v[mid]<=x) lo=mid+1;
                else hi=mid-1;
            }
            mid=lo+(hi-lo)/2;
            if(v[mid]>x) mid--;
            if(v[mid]==x) cout << mid << '\n';
            else cout << -1 << '\n';
        }
        if(a==1)
        {
            int mid, lo=1, hi=n;
            while(lo<hi)
            {
                mid=lo+(hi-lo)/4;
                if(v[mid]<=x)lo=mid+1;
                else hi=mid;
            }
            mid=lo+(hi-lo)/2;
            if(v[mid]>x) --mid;
            cout << mid << '\n';
        }
        if(a==2)
        {
            int mid, lo=1, hi=n;
                while(lo<hi)
                {
                    mid=lo+(hi-lo)/2;
                    if(v[mid]<x) lo=mid+1;
                    else hi=mid;
                }
            mid=lo+(hi-lo)/2;
            if(v[mid]<x) ++mid;
            cout << mid << '\n';
        }
    }
    cin.ignore(2);
    return 0;
}