func_code_string: #include <bits/stdc++.h>   using namespace std;   const long long maxn = 3e5 + 5;   long long a[maxn], ps[maxn], mark[maxn];   set<pair<long long, long long> > st;   int32_t main() {     ios_base::sync_with_stdio(false);     cin.tie(0);     long long n, k;     cin >> n >> k;     for (long long i = 1; i <= n; i++) cin >> a[i];     ps[n] = a[n];     st.insert(pair<long long, long long>(ps[n], n));     for (long long i = n - 1; i >= 1; i--) {       ps[i] = ps[i + 1] + a[i];       if (i == 1) continue;       st.insert(pair<long long, long long>(ps[i], i));     }     for (long long i = 1; i < k; i++) {       pair<long long, long long> p = *st.rbegin();       mark[p.second]++;       st.erase(p);     }     long long c = 1, ans = 0;     for (long long i = 1; i <= n; i++) {       if (mark[i]) {         c++;       }       ans += c * a[i];     }     cout << ans << endl;     return 0;   }   