Cod sursa(job #1200699)

Utilizator RathebaSerbanescu Andrei Victor Ratheba Data 23 iunie 2014 13:32:20
Problema Cautare binara Scor 40
Compilator cpp Status done
Runda Arhiva educationala Marime 1.45 kb
#include <cstdio>

using namespace std;

#define MAX 10005

int v[MAX], n;
int bsearch0(int st, int dr, int key)
{
    int mid;
    while(st <= dr)
    {
        mid = (st+dr)/2;
        if(v[mid] <= key)
            st = mid+1;
        else
            dr = mid-1;
    }
    mid = (st+dr)/2;
    if(v[mid] > key) mid--;
    if(v[mid] == key)
        return mid;
    return -1;
}
int bsearch1(int st, int dr, int key)
{
    int mid;
    while(st < dr)
    {
        mid = (st+dr)/2;
        if(v[mid] <= key)
            st = mid+1;
        else
            dr = mid;
    }
    mid = (st+dr)/2;
    if(v[mid] > key) mid--;
    return mid;
}
int bsearch2(int st, int dr, int key)
{
    int mid;
    while(st < dr)
    {
        mid = (st+dr)/2;
        if(v[mid] < key)
            st = mid+1;
        else
            dr = mid;
    }
    mid = (st+dr)/2;
    if(v[mid] < key) mid++;
    return mid;
}

int main()
{
    freopen("cautbin.in","r",stdin);
    freopen("cautbin.out","w",stdout);
    int i, m, cod, val;
    scanf("%d",&n);
    for(i=1; i<=n; i++)
        scanf("%d",v+i);
    scanf("%d",&m);
    while(m)
    {
        m--;
        scanf("%d %d",&cod, &val);
        if(cod==0)
            printf("%d\n",bsearch0(1,n,val));
        else if(cod==1)
            printf("%d\n",bsearch1(1,n,val));
        else if(cod==2)
            printf("%d\n",bsearch2(1,n,val));
    }
    return 0;
}