Cod sursa(job #2253854)
Utilizator | Data | 4 octombrie 2018 14:54:28 | |
---|---|---|---|
Problema | Cautare binara | Scor | 100 |
Compilator | cpp | Status | done |
Runda | Arhiva educationala | Marime | 2.11 kb |
#include <fstream>
using namespace std;
ifstream f("cautbin.in");
ofstream g("cautbin.out");
int n,v[100001],step,pos,i,m,c,x,rasp;
long long p;
int main()
{
f>>n;
p=1;
while(p<=n)
{
p=p*2;
}
for(i=1;i<=n;i++)
{
f>>v[i];
}
f>>m;
while(m--)
{
f>>c>>x;
step=p;
pos=1;
rasp=0;
if(c==0)
{
while(step>=0)
{
if(pos+step<=n && v[pos+step]<=x)
{
if(v[pos+step]==x)
{
rasp=pos+step;
}
pos+=step;
}
if(step==0)
{
break;
}
step/=2;
}
if(rasp)
{
g<<rasp<<'\n';
}
else
{
g<<"-1"<<'\n';
}
}
else if(c==1)
{
while(step>=0)
{
if(pos+step<=n && v[pos+step]<=x)
{
pos+=step;
}
if(step==0)
{
break;
}
step/=2;
}
if(pos)
{
g<<pos<<'\n';
}
else
{
g<<"-1"<<'\n';
}
}
else if(c==2)
{
while(step>=0)
{
if(pos+step<=n && v[pos+step]<x)
{
pos+=step;
}
else
{
rasp=pos+step;
}
if(step==0)
{
break;
}
step/=2;
}
if(pos)
{
g<<rasp<<'\n';
}
else
{
g<<"-1"<<'\n';
}
}
}
return 0;
}