Dice Combinations

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef vector <ll> vl;
const ll mod = 1e9 + 7;

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0); cout.tie(0);

    ll n, i, j;
    cin >> n;
    vl a(max(n + 1, 7ll));
    a[0] = 0;
    for(i = 1; i <= 6; i++)
    {
        a[i] = 1;
        for(j = 0; j < i; j++)
            a[i] += a[j];
    }
    for(; i <= n; i++)
        for(j = 1; j <= 6; j++)
            a[i] = (a[i] + a[j]) % mod;
    cout << a[n];

    return 0;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: WRONG ANSWER

Test 9

Verdict: WRONG ANSWER

Test 10

Verdict: WRONG ANSWER

Test 11

Verdict: WRONG ANSWER

Test 12

Verdict: WRONG ANSWER

Test 13

Verdict: WRONG ANSWER

Test 14

Verdict: WRONG ANSWER

Test 15

Verdict: WRONG ANSWER

Test 16

Verdict: WRONG ANSWER

Test 17

Verdict: WRONG ANSWER

Test 18

Verdict: WRONG ANSWER

Test 19

Verdict: WRONG ANSWER

Test 20

Verdict: WRONG ANSWER