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

#include
#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?

Runtime error for bigger inputs

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