Maximum sum

input/code.cpp: In function 'long long int dy(std::vector<long long int>&)':
input/code.cpp:15:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   15 |     for(int i=0; i<vals.size(); i++){
      |                  ~^~~~~~~~~~~~

#include <iostream>
#include <vector>

using namespace std;

long long max(long long a, long long b){
    if(a>b) return a;
    return b;
}

long long dy(vector<long long>& vals){
    long long sum=0;
    long long max_sum= 0;

    for(int i=0; i<vals.size(); i++){
        sum = sum + vals[i];
        max_sum = max(max_sum, sum);
        sum = max(0, sum);
    }
    return max_sum;
    

}

int main(){
    int n; 
    cin >> n;
    vector<long long> vals(n);

    for(int i=0 ; i<n; i++){
        cin >> vals[i];
    }
    cout<<dy(vals)<<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: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: WRONG ANSWER

Test 13

Verdict: WRONG ANSWER

Test 14

Verdict: WRONG ANSWER

Test 15

Verdict: WRONG ANSWER