Cod sursa(job #1497987)

Utilizator stelian2000Stelian Chichirim stelian2000 Data 7 octombrie 2015 21:07:43
Problema Cautare binara Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 1.06 kb
#include <cstdio>

using namespace std;

int v[100010];
int logn,n;

int cauta_binar(int s)
{
    int poz=0;
    for(int i=logn;i>=0;i--)
        if(poz+(1<<i)<=n && v[poz+(1<<i)]<=s) poz+=1<<i;
    return poz;
}

int cauta_binar2(int s)
{
    int poz=0;
    for(int i=logn;i>=0;i--)
        if(poz+(1<<i)<=n && v[poz+(1<<i)]<s) poz+=1<<i;
    return poz+1;
}

int main()
{
    freopen("cautbin.in","r",stdin);
    freopen("cautbin.out","w",stdout);
    int m,x,y,poz,a;
    scanf("%d",&n);
    for(logn=1;(1<<logn)<=n;logn++);
    logn--;
    for(int i=1;i<=n;i++)
        scanf("%d",&v[i]);
    scanf("%d",&m);
    for(int i=1;i<=m;i++)
    {
        scanf("%d%d",&x,&y);
        if(x==0) {poz=cauta_binar(y);
                  if(v[poz]==y) printf("%d",poz);
                  else printf("-1");}
        if(x==1) {poz=cauta_binar(y);
                  printf("\n%d",poz);}
        if(x==2) {poz=cauta_binar2(y);
                  if(v[poz]==y) printf("\n%d",poz);
                  else printf("\n%d",poz+1);}

    }
    return 0;
}