Cod sursa(job #466978)

Utilizator unknownliviuMaria Liviu Valentin unknownliviu Data 28 iunie 2010 10:20:06
Problema Cautare binara Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.9 kb
#include<fstream>
using namespace std;
ifstream in("cautbin.in");
ofstream out("cautbin.out");
int v[100010],n,m;
int cauta0(int x);
int cauta1(int x);
int cauta2(int x);
void read()
{
	int a,b;
	in>>n;
	for(int i=1;i<=n;i++)
		in>>v[i];
	in>>m;
	for(int i=0;i<m;i++)
	{
		in>>a>>b;
		if(a==0)
			out<<cauta0(b)<<'\n';
		else
		if(a==1)
			out<<cauta1(b)<<'\n';
		else
			out<<cauta2(b)<<'\n';
	}
}
int cauta0 (int x)
{
	int i,pas=1<<16;
	for(i=0;pas!=0;pas>>=1)//pas/=2
		if(i+pas<=n && v[i+pas]<=x)
			i+=pas;
	if(v[i]==x)
		return i;
	return -1;
}

int cauta1(int x)
{
	int i,pas=1<<16;
	for(i=0;pas!=0;pas>>=1)
	if(i+pas<=n && v[i+pas]<=x)
		i+=pas;
	return i;
}

int cauta2(int x)
{
	int i,pas=1<<16;
	for(i=0;pas!=0;pas>>=1)
		if(i+pas<=n && v[i+pas]<x) //primu care nu indeplineste conditia
			i+=pas;
		return 1+i;
}
int main()
{
	read();
	return 0;
}