#include <iostream>
 
int dist[] = { 3, 10, 2, 4, 6, 9 };
int refill[] = { 3, 4, 6, 3, 7, 11 };
 
static const int n = sizeof dist / sizeof *dist;
 
int main()
{
    int cum = 0, min = 0, min_index = 0;
    for (int i = 0; i < n; ++i)
    {
        cum += refill[i] - dist[i];
        std::cout << cum << ' ';
        if (cum < min)
        {
            min = cum;
            min_index = i;
        }
    }
    std::cout << "\nstart from index " << (min_index + 1) % n << " (0-based)\n";
}

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