Cod sursa(job #1021624)

Utilizator cosmin_bobeicaCosmin Bobeica cosmin_bobeica Data 3 noiembrie 2013 23:59:13
Problema Cautare binara Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 1.42 kb
#include<cstdio>
using namespace std;
int v[100100];
int bs0(int st,int dr,int val)
{
    int med,last=-1;
    while(st<=dr)
    {
        med=st+(dr-st)/2;
        if(val==v[med])
        {
            last=med;
            st=med+1;
        }
        if(val<v[med])
            dr=med-1;
        else
            st=med+1;
    }
    return last;
}
int bs1(int st,int dr,int val)
{
    int med,last=-1;
    while(st<=dr)
    {
        med=st+(dr-st)/2;
        if(v[med]<=val)
        {
            last=med;
            st=med+1;
        }
        else
            dr=med-1;
    }
    return last;

}
int bs2(int st,int dr,int val)
{
    int med,last=-1;
    while(st<=dr)
    {
        med=st+(dr-st)/2;
        if(v[med]>=val)
        {
            last=med;
            dr=med-1;
        }
        else
            st=med+1;
    }
    return last;
}
int main()
{
    freopen("cautbin.in","r",stdin);
    freopen("cautbin.out","w",stdout);
    int n,m,st,dr,t,x;
    scanf("%d",&n);
    for(int i=1;i<=n;i++)
        scanf("%d",&v[i]);
    scanf("%d",&m);
    st=1;dr=n;
    for(int i=1;i<=m;i++)
    {
        st=1;dr=n;
        scanf("%d %d",&t,&x);
        if(t==0)
            printf("%d\n",bs0(st,dr,x));
        else
            if(t==1)
                printf("%d\n",bs0(st,dr,x));
            else
                printf("%d\n",bs2(st,dr,x));

    }
    return 0;
}