Mai intai trebuie sa te autentifici.
Cod sursa(job #2253809)
| Utilizator | Data | 4 octombrie 2018 14:23:04 | |
|---|---|---|---|
| Problema | Cautare binara | Scor | 60 |
| Compilator | cpp | Status | done |
| Runda | Arhiva educationala | Marime | 1.7 kb |
#include <bits/stdc++.h>
using namespace std;
long long int n,v[1000019],m;
int caut0 (int val)
{
int nr=log2(n);
++nr;
int step=(1<<nr);
//fout<<"step="<<step<<"\n";
int cpos=1;
while (step>0)
{
if (cpos+step<=n && v[cpos+step]<=val)
{
cpos+=step;
}
step/=2;
}
return cpos;
}
int caut1 (int val)
{
int nr=log2(n);
++nr;
int step=(1<<nr);
int cpos=1;
while (step>0)
{
if (cpos+step<=n && v[cpos+step]<=val)
{
cpos+=step;
}
step/=2;
}
return cpos;
}
int caut2 (int val)
{
int nr=log2(n);
++nr;
int step=(1<<nr);
int cpos=1;
while (step>0)
{
if (cpos+step<=n && v[cpos+step]<val)
{
cpos+=step;
}
step/=2;
}
return cpos+1;
}
int main()
{
ifstream fin ("cautbin.in");
ofstream fout ("cautbin.out");
fin>>n;
for (int i=1; i<=n; ++i)
{
fin>>v[i];
}
fin>>m;
for (int i=1; i<=m; ++i)
{
int p,nr;
fin>>p>>nr;
switch (p)
{
case 0:
if (v[caut0(nr)]==nr)
{
fout<<caut0(nr)<<"\n";
}
else
{
fout<<-1<<"\n";
}
break;
case 1:
if (v[caut1(nr)]<=nr)
{
fout<<caut1(nr)<<"\n";
}
break;
case 2:
if (v[caut2(nr)]>=nr)
{
fout<<caut2(nr)<<"\n";
}
break;
}
}
return 0;
}
