PRIME1: C++ not getting accepted although giving right answers

#include <iostream>
#include <math.h>
using namespace std;

int main() {
    int t,i;
    long m,n,current,rootn,marker,markeris;
    scanf("%d\n",&t);
    while(t--)
    {
        scanf("%ld %ld",&m,&n);
        rootn=ceil((float)sqrt(n));
        rootn++;
        bool prime[rootn+1];
        bool isprime[n-m+2];
        for(i=0;i<rootn+1;i++) prime[i]=true;
        for(i=0;i<n-m+2;i++) isprime[i]=true;
        current=2;
        while(current<=rootn)
        {
            marker=2;
            while(current*marker<=rootn) 
            {
                prime[current*marker]=false;
                marker++;
            }
            markeris=ceil((float)m/current);
            if(markeris<2) markeris=2;
            while(current*markeris<=n)
            {
                isprime[current*markeris-m]=false;
                markeris++;
            }
            current++;
            while(current<=rootn && !prime[current]) current++;
        }
        for(i=0;i<=n-m;i++) if(isprime[i] && i+m>1) printf("%ld\n",i+m);
        if(t) printf("\n");
    }
    return 0;
}

This is my code. Although it is giving the write answer in ideone but it show wrong answer here. What could be the problem?