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#include<iostream>
#include <bits/stdc++.h>
using namespace std;
 
void SieveOfEratosthenes(int n,int z)
{
    // Create a boolean array "prime[0..n]" and initialize
    // all entries it as true. A value in prime[i] will
    // finally be false if i is Not a prime, else true.
    bool prime[n+1];
    memset(prime, true, sizeof(prime));
 
    for (int p=2; p*p<=n; p++)
    {
        // If prime[p] is not changed, then it is a prime
        if (prime[p] == true)
        {
            // Update all multiples of p
            for (int i=p*2; i<=n; i += p)
                prime[i] = false;
        }
    }
    if(z==1)
    z=2;
    // Print all prime numbers
    for (int p=z; p<=n; p++)
       if (prime[p])
          cout << p << " ";
}
 
// Driver Program to test above function
int main()
{
   long int a,b,n,i,k;
   cin>>n;
 
for(k=0;k<n;k++)
{
    cin>>a>>b;
    SieveOfEratosthenes(b,a);
}
    return 0;
}
 

Traceback (most recent call last):
  File "/usr/lib/python3.4/py_compile.py", line 124, in compile
    _optimize=optimize)
  File "<frozen importlib._bootstrap>", line 1532, in source_to_code
  File "<frozen importlib._bootstrap>", line 321, in _call_with_frames_removed
  File "./prog.py", line 3
    using namespace std;
                  ^
SyntaxError: invalid syntax

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3.4/py_compile.py", line 128, in compile
    raise py_exc
py_compile.PyCompileError:   File "./prog.py", line 3
    using namespace std;
                  ^
SyntaxError: invalid syntax

Standard output is empty