Maximum sum

#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++)
    {
        cin >> arr[i];
    }

    
    int best = arr[0]; 
    int sum = arr[0];

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

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

Test 1

Verdict: WRONG ANSWER

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: WRONG ANSWER

Test 5

Verdict: ACCEPTED

Test 6

Verdict: WRONG ANSWER

Test 7

Verdict: ACCEPTED

Test 8

Verdict: WRONG ANSWER

Test 9

Verdict: WRONG ANSWER

Test 10

Verdict: WRONG ANSWER

Test 11

Verdict: WRONG ANSWER

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED

Test 14

Verdict: ACCEPTED

Test 15

Verdict: ACCEPTED