Cod sursa(job #2607684)
Utilizator | Data | 30 aprilie 2020 00:23:23 | |
---|---|---|---|
Problema | Cautare binara | Scor | 100 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva educationala | Marime | 1.82 kb |
#include <fstream>
#include <algorithm>
using namespace std;
ifstream f("cautbin.in");
ofstream g("cautbin.out");
int n, m, i, t, x, st, dr, poz, mij, a[100005];
int main()
{
f >> n;
for(i = 1; i <= n; i++)
f >> a[i];
f >> m;
while(m)
{
f >> t >> x;
st = 1;
dr = n;
if(!t)
{
poz = -1;
while(st <= dr)
{
mij = (st + dr) / 2;
if(a[mij] < x)
st = mij + 1;
else
if(a[mij] == x)
{
poz = max(poz, mij);
st = mij + 1;
}
else
dr = mij - 1;
}
}
else
if(t == 1)
{
poz = -1;
while(st <= dr)
{
mij = (st + dr) / 2;
if(a[mij] <= x)
{
poz = max(poz, mij);
st = mij + 1;
}
else
dr = mij - 1;
}
}
else
{
poz = n + 1;
while(st <= dr)
{
mij = (st + dr) / 2;
if(a[mij] < x)
st = mij + 1;
else
{
poz = min(poz, mij);
dr = mij - 1;
}
}
if(poz == n + 1)
poz = -1;
}
g << poz << '\n';
m--;
}
f.close();
g.close();
return 0;
}