Dice Combinations

#include <iostream>
#include <vector>

using namespace std;

long long memo(long long n, vector<long long> & dp){
    if (n<0) {
        return 0;
    }
    if (dp[n]==-1){
        dp[n]=0;
        for (long long i=1;i<=6;i++){
            dp[n]+=memo(n-i, dp);
        }
    }
    return dp[n];
}

int main(){
    long long n;
    cin >> n;
    vector<long long> dp(n+1, -1);
    dp[0]=1;

    cout << memo(n, dp) << '\n';
}

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: 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