Cod sursa(job #1279273)
Utilizator | Data | 30 noiembrie 2014 00:15:05 | |
---|---|---|---|
Problema | Cautare binara | Scor | 0 |
Compilator | cpp | Status | done |
Runda | Arhiva educationala | Marime | 1.84 kb |
#include <fstream>
using namespace std;
ifstream fin("cautbin.in");
ofstream fout("cautbin.out");
int st,dr,ok,v[100001],i,n,m,x,z,cond,mijl,sol,vr,vt;
void cautbin(int w)
{
int st=1;
int dr=n;
sol=-1;
while(st<=dr)
{
mijl=(st+dr)/2;
if(w==v[mijl])
{
st=mijl+1;
sol=mijl;
ok=1;
}
else
if(w<v[mijl])
{
dr=mijl-1;
vr=v[dr];
}
else
{
st=mijl+1;
vt=v[st];
}
}
}
void cautbin1(int z)
{
int st=1;
int dr=n;
sol=-1;
while(st<=dr)
{
mijl=(st+dr)/2;
if(z==v[mijl])
{
ok=1;
sol=mijl;
dr=mijl-1;
}
else
if(z<v[mijl])
dr=mijl-1;
else
st=mijl+1;
}
}
int main()
{
fin>>n;
for(i=1;i<=n;i++)
fin>>v[i];
fin>>m;
for(i=1;i<=m;i++)
{
ok=0;
fin>>cond>>x;
if(cond==0)
{
cautbin(x);
if(ok==0)
fout<<-1;
else
fout<<sol<<'\n';
}
else
if(cond==1)
{
while(ok==0)
{
cautbin(x);
x=vr;
}
fout<<sol<<'\n';
}
else
{
while(ok==0)
{
cautbin1(x);
x=vt;
}
fout<<sol<<'\n';
}
}
return 0;
}