Cod sursa(job #1190266)

Utilizator victormarinMarin Victor victormarin Data 24 mai 2014 20:58:43
Problema Cautare binara Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 1.6 kb
#include <cstdio>
#define filein "cautbin.in"
#define fileout "cautbin.out"
using namespace std;

int v[100003];
int n,m;

int BIN_SEARCH0(int start,int finish,int key);
int BIN_SEARCH1(int start,int finish,int key);
int BIN_SEARCH2(int start,int finish,int key);

int main()
{
    FILE *in,*out;
    in=fopen(filein,"r");
    out=fopen(fileout,"w");
    fscanf(in,"%d",&n);
    int i;
    for (i=1; i<=n; i++)
        fscanf(in,"%d",v+i);
    fscanf(in,"%d",&m);
    int type,x;
    for (i=1; i<=m; i++)
    {
        fscanf(in,"%d%d",&type,&x);
        if (type==0) fprintf(out,"%d\n",BIN_SEARCH0(1,n,x));
        if (type==1) fprintf(out,"%d\n",BIN_SEARCH1(1,n,x));
        if (type==2) fprintf(out,"%d\n",BIN_SEARCH2(1,n,x));
    }

    fclose(in);
    fclose(out);
    return 0;
}

int BIN_SEARCH0(int start,int finish,int key)
{
    int mij=(start+finish)/2;
    if (v[mij]<key) return BIN_SEARCH0(mij+1,finish,key);
    if (v[mij]>key) return BIN_SEARCH0(start,mij-1,key);
    if (v[mij]==key)
    {
        if (v[mij+1]==key) return BIN_SEARCH0(start+1,finish,key);
        return mij;
    }
}

int BIN_SEARCH1(int start,int finish,int key)
{
    int mij=(start+finish)/2;
    if (v[mij]<=key && v[mij+1]>key) return mij;
    if (v[mij]<=key) return BIN_SEARCH1(mij+1,finish,key);
    else return BIN_SEARCH1(start,mij-1, key);
}

int BIN_SEARCH2(int start,int finish,int key)
{
    int mij=(start+finish)/2;
    if (v[mij]>=key && v[mij-1]<key) return mij;
    if (v[mij]>=key) return BIN_SEARCH2(start,mij-1,key);
    else return BIN_SEARCH2(mij+1,finish,key);
}