Submission #785053

#	Time	Username	Problem	Language	Result	Execution time	Memory
785053		gun_gan	Let's Win the Election (JOI22_ho_t3)	C++17	5 / 100	9 ms	332 KiB

Main

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
 
const int MX = 505;
 
int N, K;
int a[MX], b[MX];
 
vector<pair<int, int>> v;
 
int main() {
      cin.tie(0); ios_base::sync_with_stdio(0);
 
      cin >> N >> K;
 
      int tot = 0;
      for(int i = 1; i <= N; i++) {
            cin >> a[i] >> b[i];
            if(b[i] == -1) b[i] = 2e9;
            else tot++;
            v.push_back({b[i], a[i]});
      }
 
      sort(v.begin(), v.end(), [&](auto x, auto y) {
            return  x.first - x.second < y.first - y.second;
      });

      double ans = 1e9;

      for(int x = 0; x <= min(K, tot); x++) {
            int cnt = 1;
            double res = 0;
            vector<int> t;

            for(int i = 0; i < x; i++) t.push_back(v[i].first);
            sort(t.begin(), t.end());

            for(int i = 0; i < x; i++) {
                  res += (double) t[i] / cnt;
                  cnt++;
            }

            t.clear();
            for(int i = x; i < N; i++) t.push_back(v[i].second);
            sort(t.begin(), t.end());

            for(int i = 0; i < K - cnt + 1; i++) {
                  res += (double) t[i] / cnt;
            }

            ans = min(ans, res);
      }

      cout << fixed << setprecision(10) << ans << '\n';
 
}   

• Subtask 1: 5 / 5
• Subtask 2: 0 / 5
• Subtask 3: 0 / 11
• Subtask 4: 0 / 12
• Subtask 5: 0 / 33
• Subtask 6: 0 / 11
• Subtask 7: 0 / 23