Card game

#include <iostream>
#include <vector>
#include <utility>

using namespace std;

int main(){
    int n;
    cin >> n;
    if (n < 3) {
        cout << "0" << endl;
        return 0;
    } 
    vector<int> nums(n);
    vector<pair<int, int>> best(n);
    cin >> nums[0];
    cin >> nums[1];
    best[2] = {nums[1], nums[1]};
    cin >> nums[2];
    int maxim = nums[1];
    for (int i = 3; i < n; ++i) {
        cin >> nums[i];
        int add = max(best[i-3].first, best[i-3].second);
        best[i] = {nums[i-1] + add, maxim};
        maxim = best[i].first > maxim ? best[i].first : maxim;
    }
    cout << maxim << 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