PNUMBER C++

#include <bits/stdc++.h>
using namespace std;
#define maxx 2000005
int a, b;
int p[maxx];

void fi(){
    
}

void sang(){
    p[0] = 1;
    p[1] = 1;
    for (int i=2;i<=int(sqrt(maxx));i++)
    {
        if (p[i] == 0)
        {
            j=i*i;
            while(j<maxx)
            {
                p[j]=1;
                j=j+i;
            }
        }
    }
}

void xuat(){
    for (int i=a;i<=b;i++){
        if (p[i] == 0)
            cout<<i<<endl;
    }
}

int main(){
    freopen("PNUMBER.inp", "r", stdin);
    freopen("PNUMBER.out", "w", stdout);
    scanf("%d %d", &a, &b);
    sang();
    xuat();
}