Card game

#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

template <class T>
void print_v(vector<T> &v) { cout << "{"; for (auto x : v) cout << x << ","; cout << "\b}"; }



int main()
{
    int n;
    cin >> n;
    vector<int> values;


    for (int i = 0; i < n; i++)
    {
        int a;
        cin >> a;
        values.push_back(a);
    }
    if (n < 3)
    {
        cout << 0 << "\n";
        return 0;
    }
    int maxvalue[n];
    maxvalue[0] = 0;

    for (int i = 1; i < n - 1; i++)
    {
        maxvalue[i] = 0;
        int last_value = 0;
        if (i - 3 >= 0)
            last_value = maxvalue[i - 3];

        int current_value = values[i] + last_value;
        int previous_maxvalue = 0;
        previous_maxvalue = maxvalue[i - 1];

        maxvalue[i] = max(current_value, previous_maxvalue);

    }
    cout << maxvalue[n - 2] << "\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: 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