func_code_string: #include <bits/stdc++.h>   using namespace std;   long long const INF = 1e18;   long long s[300100], a[300100];   int n, k;   int main() {     ios::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);     cin >> n >> k;     for (int i = 1; i <= n; i++) cin >> a[i];     s[n + 1] = 0;     for (int i = n; i >= 1; i--) s[i] = s[i + 1] + a[i];     s[0] = s[1];     sort(s + 2, s + n + 1);     long long res = 0;     for (int i = n; i >= n - k + 2; i--) res = res + s[i];     res += s[1];     cout << res << endl;     return 0;   }   