Cod sursa(job #1772430)
| Utilizator | Data | 6 octombrie 2016 19:06:36 | |
|---|---|---|---|
| Problema | Cautare binara | Scor | 0 |
| Compilator | cpp | Status | done |
| Runda | Arhiva educationala | Marime | 1.7 kb |
#include <fstream>
using namespace std;
ifstream fin("cautbin.in");
ofstream fout("cautbin.out");
int i,j,n,v[1000],a,b,m;
int zero(int st, int dr, int k)
{
int mijl;
while(st<dr)
{
mijl=(st+dr)/2;
if(v[mijl]<=k)
return mijl;
if(k>v[mijl])
st=mijl+1;
else
dr=mijl-1;
}
return -1;
}
int unu (int st, int dr, int k) {
int mijl;
while(st<dr)
{
mijl=(st+dr)/2;
if(v[mijl]==k)
return mijl;
if(k>v[mijl])
st=mijl+1;
else
dr=mijl-1;
}
return 0;
}
int doi(int st,int dr,int k)
{
int mijl;
int e;
while(st<dr)
{
mijl=(st+dr)/2;
if(v[mijl]>=k)
e=mijl;
if(k>v[mijl])
st=mijl+1;
else
dr=mijl-1;
}
return e;
}
int main()
{
fin>>n;
for(i=1;i<=n;i++)
fin>>v[i];
fin>>m;
for(i=1;i<=m;i++)
{
fin>>a>>b;
int w;
if(a==0)
{
w=zero(1,n,b);
if(w!=-1)
{
while(v[w]==b)
w++;
fout<<w-1<<'\n';
}
else
fout<<-1<<'\n';
}
if(a==1)
{
w=unu(1,n,b);
while(v[w]<=b)
w++;
fout<<w-1<<'\n';
}
if(a==2)
{
w=doi(1,n,b);
while(v[w]>=b)
w--;
fout<<w+1<<'\n';
}
}
return 0;
}
