Maximum sum

input/code.cpp: In function 'int main()':
input/code.cpp:11:22: warning: 'n' is used uninitialized [-Wuninitialized]
   11 |     vector<int> arr(n);
      |                      ^
input/code.cpp:9:9: note: 'n' was declared here
    9 |     int n;
      |         ^

#include <iostream>
#include <vector>
#include <algorithm>
// brute force got time limit exceeded

using namespace std;

int main() {
    int n;

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

    long long max_sum = arr[0];
    long long max_curr = arr[0];

    for (int i = 1; i < n; i++) {
        max_curr = max((long long)arr[i], max_curr + arr[i]);
        max_sum = max(max_sum, max_curr);
    }

    cout << max_sum << "\n";
}

Test 1

Verdict: RUNTIME ERROR

Test 2

Verdict: RUNTIME ERROR

Test 3

Verdict: RUNTIME ERROR

Test 4

Verdict: RUNTIME ERROR

Test 5

Verdict: RUNTIME ERROR

Test 6

Verdict: RUNTIME ERROR

Test 7

Verdict: RUNTIME ERROR

Test 8

Verdict: RUNTIME ERROR

Test 9

Verdict: RUNTIME ERROR

Test 10

Verdict: RUNTIME ERROR

Test 11

Verdict: RUNTIME ERROR

Test 12

Verdict: RUNTIME ERROR

Test 13

Verdict: RUNTIME ERROR

Test 14

Verdict: RUNTIME ERROR

Test 15

Verdict: RUNTIME ERROR