Cod sursa(job #2167933)

Utilizator SternulStern Cristian Sternul Data 14 martie 2018 06:19:08
Problema Cautare binara Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 1.73 kb
#include <iostream>
#include <fstream>
#define NMAX 100005
using namespace std;

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

int a[NMAX];
int n, m, p, x;

void citeste()
{
    f>>n;
    for(int i = 1;i <= n;i++)
        f>>a[i];
    f>>m;
}

int zero(int x, int st, int dr)
{
    if(st<dr){
        int mid = st + (dr - st)/2;
        if(a[mid] == x){
            if(a[mid + 1] != x)
                return mid;
            else{
                while(a[mid + 1] == a[mid])
                    mid++;
                return mid;
            }
        }
        else if(a[mid] < x)
            return zero(x, mid + 1, dr);
        else return zero(x, st, mid - 1);
    }
}

int unu(int x, int st, int dr)
{
    if(st<dr){
        int mid = st + (dr - st)/2;
        if(a[mid] <= x){
            if(a[mid + 1] > x)
                return mid;
            else{
                while(a[mid + 1] <= x)
                    mid++;
                return mid;
            }
        }
        else return unu(x, st, mid - 1);
    }
}

int doi(int x, int st, int dr)
{
    if(st<dr){
        int mid = st + (dr - st)/2;
        if(a[mid] <= x){
            if(a[mid + 1] > x)
                return mid;
            else{
                while(a[mid - 1] >= a[mid] && a[mid - 1] <= x)
                    mid--;
                return mid;
            }
        }
        else return doi(x, mid + 1, dr);
    }
}


void solve()
{
    for(int i = 1;i <= m;i++){
        f>>p>>x;
        if(p==0)
            g<<zero(x, 1, n)<<'\n';
        else if(p == 1)
            g<<unu(x, 1, n)<<'\n';
        else g<<doi(x, 1, n)<<'\n';
    }

}

int main()
{
    citeste();
    solve();
}