Dice Combinations

#include <iostream>
#include <math.h>

int MOD = 1000000007;

int helper(int n, int * done, int * memory){
	if(n == 0){
		return 1;
	}
	if(done[n] == true){
		return memory[n];
	}
	
	int ans = 0;
	for(int i = 1; i < 7; i++){
		if (n - i < 0) break;
		ans += helper(n-i, done, memory) % MOD;
	}
	done[n] = true;
	memory[n] = ans;
	return ans;
}

int main(){
	int n;
	std::cin >> n;
	int done[n];
	int memory[n];
	for (int i = 0; i < n; i++){
		done[i] = false;
		memory[i] = 0;
	}
	int ans = helper(n, done, memory);
	std::cout << ans;
	return 1;
}

Test 1

Verdict: RUNTIME ERROR

Test 2

Verdict: RUNTIME ERROR

Test 3

Verdict: RUNTIME ERROR

Test 4

Verdict: RUNTIME ERROR

Test 5

Verdict: RUNTIME ERROR

Test 6

Verdict: RUNTIME ERROR

Test 7

Verdict: RUNTIME ERROR

Test 8

Verdict: RUNTIME ERROR

Test 9

Verdict: RUNTIME ERROR

Test 10

Verdict: RUNTIME ERROR

Test 11

Verdict: RUNTIME ERROR

Test 12

Verdict: RUNTIME ERROR

Test 13

Verdict: RUNTIME ERROR

Test 14

Verdict: RUNTIME ERROR

Test 15

Verdict: RUNTIME ERROR

Test 16

Verdict: RUNTIME ERROR

Test 17

Verdict: RUNTIME ERROR

Test 18

Verdict: RUNTIME ERROR

Test 19

Verdict: RUNTIME ERROR

Test 20

Verdict: RUNTIME ERROR