#include <iostream>
#include <fstream>
#include <cstdlib>
#include <ctime>
#include <algorithm>
using namespace std;
void varianta_1(unsigned int v[], unsigned int n, unsigned int s)
{
for(unsigned int i = 0; i < n; i++)
{
if(v[i] >= s/2)
break;
unsigned int x = s - v[i];
for(unsigned int j = i + 1; j < n; j++)
{
if(v[j] == x)
{
cout << v[i] << ' ' << x << endl;
break;
}
if(v[j] > x)
break;
}
}
}
void varianta_2(unsigned int v[], unsigned int n, unsigned int s){
for(unsigned int i = 0; i < n; i++)
{
if(v[i] >= s/2)
break;
unsigned int x = s - v[i];
unsigned int st = i + 1, dr = n-1;
while (st <= dr){
unsigned int mij = (st + dr)/2;
if (v[mij] == x){
cout << v[i] << ' ' << x << endl;
break;
} else {
if (x < v[mij]){
dr = mij-1;
} else {
st = mij + 1;
}
}
}
}
}
void generareTeste(const char nume_fisier[], unsigned int n)
{
unsigned int i, vcrt, r, x, y;
srand(time(NULL));
ofstream fout(nume_fisier);
fout << n << endl;
//primul numar este cuprins intre 1 si 100
vcrt = 1 + (rand() * rand()) % 100;
fout << vcrt << " ";
//restul elementelor vor fi cuprinse intre vcrt+1 si vcrt+1000
x = y = 0;
for(i = 1; i < n; i++)
{
r = 1 + (rand() * rand()) % 1000;
vcrt = vcrt + r;
//sansele ca r >= 500 sunt, teoretic, 50%
if(r >= 500)
if(x == 0)
x = vcrt;
else if(y == 0)
y = vcrt;
fout << vcrt << " ";
}
fout << endl << x + y << endl;
fout.close();
}
void citireDate(const char nume_fisier[], unsigned int v[], unsigned int &n, unsigned int &s)
{
ifstream fin(nume_fisier);
fin >> n;
for(int i = 0; i < n; i++)
fin >> v[i];
fin >> s;
fin.close();
}
unsigned int v[1000000];
int main()
{
unsigned int n, s;
generareTeste("preturi.in", 1000000);
citireDate("preturi.in", v, n, s);
varianta_1(v, n, s);
cout << endl;
varianta_2(v, n, s);
return 0;
}
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