Cod sursa(job #666923)

Utilizator monica11Szekely Monica monica11 Data 22 ianuarie 2012 14:08:53
Problema Cautare binara Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.01 kb
#include<fstream>
using namespace std;
int a[100001],m,n,x,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)
			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(int i=1;i<=n;++i)
		f>>a[i];
		f>>m;
	for(int i=1;i<=m;++i)
	{
		f>>y>>x;
		if(y==0)
			g<<bin_search0(1,n,x)<<"\n";
		if(y==1)
			g<<bin_search1(1,n,x)<<"\n";
		if(y==2)
			g<<bin_search2(1,n,x)<<"\n";
	}
	return 0;
}