Cod sursa(job #630399)

Utilizator suzanicaSuzanica Mihu suzanica Data 5 noiembrie 2011 15:10:58
Problema Cautare binara Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 0.98 kb
#include<fstream>
using namespace std;
int n,a[100001],m,x,y,i;
int bs0(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 bs1(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 bs2(int st, int dr, int x)
{
	int mij;
	while(st<dr)
	{
		mij=(st+dr)/2;
		if(a[mij]>=x)
			dr=mij;
		else
			st=mij+1;
	}
	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<<bs0(1,n,x)<<"\n";
		else
			if(y==1)
				g<<bs1(1,n,x)<<"\n";
			else
				if(y==2)
					g<<bs2(1,n,x);
	}
	return 0;
}