Cod sursa(job #442324)

Utilizator dead_knightTitei Paul Adrian dead_knight Data 14 aprilie 2010 09:49:54
Problema Cautare binara Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 1.29 kb
#include<fstream>
#include<iostream>
#include<cstdio>
#define maxn 100002
#define INFI 2147483647
using namespace std;
int n, m, v[maxn], rez;

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

void cauta2(int x, int st , int dr)
{
    int mij=(st+dr)/2;
    if(v[mij]>=x)
    {
        //printf("%d %d\n", mij, reZ);
        if(mij<rez)
        {
            rez=mij;
        }
        if(st<mij)
            cauta2(x, st, mij-1);
    }
    else if(st<dr)
            cauta2(x, mij+1, dr);
}
int main()
{
    int i, op, x, rezz;
    ifstream fin("cautbin.in");
    freopen("cautbin.out", "w", stdout);
    fin>>n;
    for(i=1;i<=n;++i)
        fin>>v[i];
    fin>>m;
    for(i=1;i<=m;++i)
    {
        fin>>op>>x;
        if(!op)
        {
            rezz=cauta(x);
            if(v[rezz]==x)
                printf("%d\n", rezz);
            else
                printf("-1\n");
        }
        else if(op==1)
            printf("%d\n", cauta(x));
        else
        {
            rez=INFI;
            cauta2(x, 1, n);
            printf("%d\n", rez);
        }
    }
    return 0;
}