Maximum sum

input/code.cpp: In function 'int main()':
input/code.cpp:10:9: error: return-statement with no value, in function returning 'int' [-fpermissive]
   10 |         return;
      |         ^~~~~~

#include "iostream"
#include "algorithm"


int main() {
    int n;
    std::cin >> n;
    if (n <= 0) {
        std::cout << 0 << std::endl;
        return;
    }
    int values[n];
    for (int i = 0; i < n; i++) {
        std::cin >> values[i];
    }
    int sums[n+1];
    for (int i = 0; i <= n; i++) {
        sums[i] = 0;
    }
    int max = values[0];
    for (int i = 1; i <= n; i++) {
        sums[i] = std::max(values[i - 1], values[i - 1] + sums[i - 1]);
        if (sums[i] > max) max = sums[i];
    }
    std::cout << max << std::endl;
}