家人们这居然是用ai写的代码，ac了我真的……

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
int main() {
    int n, m;
    std::cin >> n >> m;

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

    int min_sum = 0;
    for (int i = 0; i < m; i++) {
        min_sum += pain_values[i];
    }
    int current_sum = min_sum;

    for (int i = m; i < n; i++) {
        current_sum += pain_values[i] - pain_values[i - m];
        min_sum = std::min(min_sum, current_sum);
    }

    std::cout << min_sum << std::endl;

    return 0;
}