Maximum sum

#include<iostream>
#include<vector>
#include<algorithm>

using namespace std;

int maxSub(const vector<int> & values, int n){
    int sum = 0;
    int max_sum = 0;
    for(int i = 0; i < n; ++i){
        sum += values[i];
        if(sum < 0) sum = 0;
        if(sum > max_sum) max_sum = sum;
    }
    return max_sum;
}
int main(){
    int n;
    cin >> n;
    vector<int> values(n);
    for(int i = 0; i < n; ++i)
        cin >> values[i];

    cout<<maxSub(values,n)<<endl;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: WRONG ANSWER

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: WRONG ANSWER

Test 8

Verdict: WRONG ANSWER

Test 9

Verdict: WRONG ANSWER

Test 10

Verdict: WRONG ANSWER

Test 11

Verdict: ACCEPTED

Test 12

Verdict: WRONG ANSWER

Test 13

Verdict: WRONG ANSWER

Test 14

Verdict: WRONG ANSWER

Test 15

Verdict: WRONG ANSWER