Maximum sum

input/code.cpp: In function 'int main()':
input/code.cpp:20:20: error: conversion from 'int' to non-scalar type 'std::array<int, 1>' requested
   20 |         array[n] = 0;
      |                    ^

#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;

    long long arr[n];

    for (int i = 0; i < n; i++)
    {
        array[n] = 0;
        cin >> arr[i];
    }

    
    long long best = 0; 
    long long sum = 0;

    for (int i = 0; i < n; i++) {
        sum = max(arr[i], sum + arr[i]);
        best = max(best, sum);
    }

    cout << best << "\n";
}