Card game

input/code.cpp:8:1: error: 'vector' does not name a type; did you mean 'perror'?
 vector<int> points;
 ^~~~~~
 perror
input/code.cpp:9:1: error: 'vector' does not name a type; did you mean 'perror'?
 vector<int> cost;
 ^~~~~~
 perror
input/code.cpp: In function 'int main(int, char**)':
input/code.cpp:20:9: error: 'points' was not declared in this scope
         points.push_back(p);
         ^~~~~~
input/code.cpp:20:9: note: suggested alternative: 'printf'
         points.push_back(p);
         ^~~~~~
         printf
input/code.cpp:28:5: error: 'cost' was not declared in this scope
     cost.push_back(0);
     ^~~~
input/code.cpp:28:5: note: suggested alternative: 'pclose'
     cost.push_back(0);
     ^~~~
     pclose
input/code.cpp:30:20: error: 'points' was not declared in this scope
     cost.push_back(points[1]);
                    ^~~~~~
input/code.cpp:30:20: note: suggested alternative: 'printf'
     cost.push_back(points[1]);
                    ^~~~~~
                    printf...

#include <iostream>
#include <cstdio>
#include <algorithm>
#include <stack>

using namespace std;

vector<int> points;
vector<int> cost;

int main(int argc, char *argv[])
{
    ios::sync_with_stdio(0);
    int n = 0;
    cin >> n;

    for (int i = 0; i < n; ++i) {
        int p;
        cin >> p;
        points.push_back(p);
    }

    if (n == 1 || n == 2) {
        cout << 0 << endl;
        return 0;
    }

    cost.push_back(0);
    cost.push_back(0);
    cost.push_back(points[1]);

    for (int i = 3; i < n; ++i) {
        int cur_sum = points[i - 1] + cost[i - 3];
        cost.push_back(max(cur_sum, cost[i - 1]));
    }

//    for (int i = 0; i < cost.size(); ++i) {
//        cout << cost[i] << endl;
//    }

    cout << cost[n - 1] << endl;

    return 0;
}