Dice Combinations

#include <bits/stdc++.h>

using namespace std;

typedef unsigned long long ull;

int main(){
    int n;
    cin >> n;
    ull no[1000001];
    no[0] = 1;
    for(int i=1; i<n+1; i++){
        ull x = 0;
        for(int j=1; j<7; j++){
            if(i < j)
                continue;
            x = (x+no[(i-j)%7]) % 1000000007ULL;
        }
        no[i%7]=x;
    }
    cout << (no[n%7]%(1000000007ULL)) << endl;
    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: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED

Test 14

Verdict: ACCEPTED

Test 15

Verdict: ACCEPTED

Test 16

Verdict: ACCEPTED

Test 17

Verdict: ACCEPTED

Test 18

Verdict: ACCEPTED

Test 19

Verdict: ACCEPTED

Test 20

Verdict: ACCEPTED