Cod sursa(job #664199)

Utilizator monica11Szekely Monica monica11 Data 19 ianuarie 2012 19:58:08
Problema Cautare binara Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 0.97 kb
#include<fstream>
using namespace std;
int n,i,a[100001],x,m,y;
int bin_search0 (int st, int dr, int x)
{
	int mij;
	while(st<=dr)
	{
		mij=(st+dr)/2;
		if(a[mij]<=x)
			st=mij+1;
		else
			dr=mij-1;
	}
	mij=(st+dr)/2;
	if(a[mij]>x)
		--mij;
	if(a[mij]==x)
		return mij;
	else
		return -1;
}
int bin_search1(int st,int dr,int x)
{
	int mij;
	while(st<dr)
	{
		mij=(st+dr)/2;
		if(a[mij]<=x)
			st=mij+1;
		else
			dr=mij;
	}
	mij=(st+dr)/2;
	if(a[mij]>x)
		--mij;
	return mij;
}
int bin_search2(int st,int dr,int x)
{
	int mij;
	while(st<dr)
	{
		mij=(st+dr)/2;
		if(a[mij]<x)
			++mij;
	}
		return mij;
}
int main()
{
	ifstream f("cautbin.in");
	ofstream g("cautbin.out");
		f>>n;
		for(i=1;i<=n;i++)
			f>>a[i];
		f>>m;
		for(i=1;i<=m;i++)
		{
			f>>y>>x;
			if(y==0)
				g<<bin_search0(1,n,x)<<"\n";
		else
			if(y==1)
				g<<bin_search1(1,n,x)<<"\n";
		else
			if(y==2)
				g<<bin_search2(1,n,x)<<"\n";
		}
			return 0;
}