Card game

input/code.cpp: In function 'int main()':
input/code.cpp:18:19: warning: comparison of integer expressions of different signedness: 'int' and 'ull' {aka 'long long unsigned int'} [-Wsign-compare]
   18 |     for(int i=0; i<n; i++){
      |                  ~^~
input/code.cpp:32:19: warning: comparison of integer expressions of different signedness: 'int' and 'ull' {aka 'long long unsigned int'} [-Wsign-compare]
   32 |     for(int i=7; i<n-1; i++){
      |                  ~^~~~

#include <bits/stdc++.h>

using namespace std;

typedef unsigned long long ull;

ull n;
uint8_t xs[1000000];
ull s[1000000];

// void makeTable(){
//     vector<uint8_t> s(1000000*1000000,0);
//     cout << s.size() << endl;
// }

int main(){
    cin >> n;
    for(int i=0; i<n; i++){
        unsigned x;
        cin >> x;
        xs[i] = x;
    }

    for(int i=1; i<4; i++){
        s[i] = xs[i];
    }
    s[4] = xs[4] + s[1];
    for(int i=5; i<7; i++){
        s[i] = xs[i] + max(s[i-4], s[i-3]);
    }

    for(int i=7; i<n-1; i++){
        s[i] = xs[i] + max({
            s[i-5], s[i-4], s[i-3]
        });
    }

    auto best = max({s[n-2], s[n-3], s[n-4]});
    cout << best << 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: WRONG ANSWER

Test 13

Verdict: WRONG ANSWER

Test 14

Verdict: WRONG ANSWER

Test 15

Verdict: ACCEPTED