Cod sursa(job #233998)

Utilizator marcelcodreaCodrea Marcel marcelcodrea Data 19 decembrie 2008 20:36:57
Problema Cautare binara Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 1.59 kb
#include<stdio.h>

int a[100005];
int n;
int m;
int poz;
int b;
int c;


int BS2(int s, int d, int val)
{
    int poz;
    while (s <= d)
     {
       int mij = (s + d) / 2;
       if (val <= a[mij])
        {
            d = mij - 1;
            poz = mij;
        }
       if (val > a[mij]) s = mij + 1;

     }
   return poz;
}


int BS1(int s, int d, int val)
{
    int poz;
    while (s <= d)
     {
       int mij = (s + d) / 2;
       if (val < a[mij]) d = mij - 1;
       if (val >= a[mij])
         {
             poz = mij;
             s = mij + 1;
         }

     }
   return poz;
}


void BS0(int s, int d, int val)
{
    while (s < d)
     {
       int mij = (s + d) / 2;
       if (val < a[mij]) d = mij - 1;
       if (val > a[mij]) s = mij + 1;
       if (val == a[mij])
         {
             poz = mij;
             s = d;
         }

     }
   if (val == a[s]) poz = s;
}

int main()
{
    freopen("grader_test1.in","r",stdin);
    freopen("cautbin.out","w",stdout);

    scanf("%d",&n);
    for(int i = 1; i <= n; i++)
     scanf("%d", &a[i]);
    scanf("%d",&m);
    for(int i = 1; i <= m; i++)
     {
         scanf("%d %d", &b, &c);
         if (b == 0)
          {
              poz = -1;
              BS0(1,n,c);
              printf("%d \n",poz);
          }
         if (b == 1)
          {
              poz = BS1(1,n,c);
              printf("%d \n",poz);
          }
         if (b == 2)
          {
              poz = BS2(1,n,c);
              printf("%d \n",poz);
          }
     }
    return 0;
}