Cod sursa(job #3280103)
Utilizator | Data | 25 februarie 2025 13:46:18 | |
---|---|---|---|
Problema | Cautare binara | Scor | 0 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva educationala | Marime | 2.44 kb |
#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cautbin.in");
ofstream fout("cautbin.out");
int mij,dr,st=1,n,M,x,v[100001],optiune;
void cautbin(int op)
{
switch(op)
{
case 0:
{
int k=0;
while(st<=dr)
{
if(v[mij]>x)
{
dr=mij-1;
mij=(st+dr)/2;
}
if(v[mij]<x)
{
st=mij+1;
mij=(st+dr)/2;
}
if(v[mij]==x)
{
break;
}
}
for(int i=mij;i<=n;i++)
{
if(v[i]==x)
k++;
else
{
fout<<i-1<<endl;break;
}
}
if(k==0)
fout<<-1<<endl;
break;
}
case 1:
{
while(st<=dr)
{
if(v[mij]<x)
{
st=mij+1;
mij=(st+dr)/2;
}
if(v[mij]>x)
{
dr=mij-1;
mij=(st+dr)/2;
}
if(v[mij]==x)
{
break;
}
}
for(int i=mij;i<=n;i++)
if(v[i+1]>x)
{
fout<<i<<endl;break;
}
break;
}
case 2:
{
while(st<=dr)
{
if(v[mij]<x)
{
st=mij+1;
mij=(st+dr)/2;
}
if(v[mij]>x)
{
dr=mij-1;
mij=(st+dr)/2;
}
if(v[mij]==x)
{
break;
}
}
int k=0;
while(v[mij]>=x)
{
mij--;
}
fout<<mij+1<<endl;
break;
}
}
}
int main()
{
fin>>n;
for(int i=1;i<=n;i++)
fin>>v[i];
fin>>M;
for(int i=0;i<M;++i)
{
fin>>optiune>>x;
st=1;
dr=n;
mij=(st+dr)/2;
cautbin(optiune);
}
}