Submission #734972

#	Time	Username	Problem	Language	Result	Execution time	Memory
734972		Sam_a17	Let's Win the Election (JOI22_ho_t3)	C++17	56 / 100	2626 ms	1008564 KiB

Main

#define _CRT_SECURE_NO_WARNINGS
#include <bits/stdc++.h>
//#include "temp.cpp"
#include <cstdio>
using namespace std;
 
#ifndef ONLINE_JUDGE
#define dbg(x) cerr << #x <<" "; print(x); cerr << endl;
#else
#define dbg(x)
#endif
 
#define sz(x) (int((x).size()))
#define len(x) (int)x.length()
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define clr(x) (x).clear()
#define uniq(x) x.resize(unique(all(x)) - x.begin());
#define blt(x) __builtin_popcount(x)
 
#define pb push_back
#define popf pop_front
#define popb pop_back
 
void print(long long t) {cerr << t;}
void print(int t) {cerr << t;}
void print(string t) {cerr << t;}
void print(char t) {cerr << t;}
void print(double t) {cerr << t;}
void print(long double t) {cerr << t;}
void print(unsigned long long t) {cerr << t;}
 
template <class T, class V> void print(pair <T, V> p);
template <class T> void print(vector <T> v);
template <class T> void print(set <T> v);
template <class T, class V> void print(map <T, V> v);
template <class T> void print(multiset <T> v);
template <class T, class V> void print(T v[],V n) {cerr << "["; for(int i = 0; i < n; i++) {print(v[i]); cerr << " "; } cerr << "]";}
template <class T, class V> void print(pair <T, V> p) {cerr << "{"; print(p.first); cerr << ","; print(p.second); cerr << "}";}
template <class T> void print(vector <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(deque <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(set <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(multiset <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T, class V> void print(map <T, V> v) {cerr << "[ "; for (auto i : v) {print(i); cerr << " ";} cerr << "]";}
 
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
#define nl '\n'
 
// for grid problems
int dx[8] = {-1,0,1,0,1,-1,1,-1};
int dy[8] = {0,1,0,-1,1,1,-1,-1};
 
// lowest / (1 << 17) >= 1e5 / (1 << 18) >= 2e5 / (1 << 21) >= 1e6
void fastIO() {
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr); cout.tie(nullptr);
}
// file in/out
void setIO(string str = "") {
  fastIO();
 
  if (str != "") {
    freopen((str + ".in").c_str(), "r", stdin);
    freopen((str + ".out").c_str(), "w", stdout);
  }
}
// Indexed Set
template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
const double inf = 1e9;
const int N = 1e2 + 10;
double dp[5 * N][5 * N][5 * N];
int n, k;

void solve_() {
  cin >> n >> k;

  vector<pair<double, double>> vec;
  for(int i = 1; i <= n; i++) {
    double a, b; cin >> a >> b;
    vec.emplace_back(b, a);
  }

  sort(all(vec));

  if(n <= 100 || k == n) {
    double pi = inf;

    for(int qq = 0; qq <= n; qq++) {

      double ci = qq + 1;

      for(int i = 0; i <= n; i++) {
        for(int j = 0; j <= n; j++) {
          if(k == n) {
            dp[i][j][i - j] = inf;
          } else {
            for(int e = 0; e <= n; e++) {
              dp[i][j][e] = inf;
            }
          }
        }
      }


      dp[0][0][0] = 0;

      for(int i = 0; i < n; i++) {
        for(int j = 0; j <= qq; j++) {

          if(k == n) {
            int e = i - j;
            if(j + 1 <= qq && vec[i].first != -1) {
              double qn = j + 1;
              dp[i + 1][j + 1][e] = min(dp[i + 1][j + 1][e], dp[i][j][e] + vec[i].first / qn);
            }
            dp[i + 1][j][e + 1] = min(dp[i + 1][j][e + 1], dp[i][j][e] + vec[i].second / ci);
            dp[i + 1][j][e] = min(dp[i + 1][j][e], dp[i][j][e]);
          } else {
            for(int e = 0; e <= n && e + j <= i; e++) {
              if(j + 1 <= qq && vec[i].first != -1) {
                double qn = j + 1;
                dp[i + 1][j + 1][e] = min(dp[i + 1][j + 1][e], dp[i][j][e] + vec[i].first / qn);
              }
              dp[i + 1][j][e + 1] = min(dp[i + 1][j][e + 1], dp[i][j][e] + vec[i].second / ci);
              dp[i + 1][j][e] = min(dp[i + 1][j][e], dp[i][j][e]);
            }
          }
        }
      }
      pi = min(pi, dp[n][qq][max(0, k - qq)]);
    }

    cout << setprecision(7) << pi << '\n';
    return;
  }

  double p = inf;
  for(int i = 0; i <= n; i++) {
    double cnt = 1, ans = 0;
    vector<double> vi;

    int cc = 0;
    for(int j = 0; j < i; j++) {
      if(vec[j].first == -1) {
        vi.push_back(vec[j].second);
        continue;
      }
      cc++;
      ans += vec[j].first / cnt;
      cnt += 1;
    }

    for(int j = i; j < n; j++) {
      vi.push_back(vec[j].second);
    }
    sort(all(vi));

    int it = 0, mm = k - cc;
    while(mm > 0) {
      ans += vi[it] / cnt; 
      it++, mm--;
    }

    p = min(p, ans);
  }

  cout << setprecision(15) << p << '\n';
}
 
int main() {
  setIO();
 
  auto solve = [&](int test_case)-> void {
    while(test_case--) {
      solve_();
    }
  };
 
  int test_cases = 1;
  // cin >> test_cases;
  solve(test_cases);
 
  return 0;
} 

Compilation message (stderr)

Main.cpp: In function 'void setIO(std::string)':
Main.cpp:64:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   64 |     freopen((str + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:65:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   65 |     freopen((str + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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