Submission #879653

#	Time	Username	Problem	Language	Result	Execution time	Memory
879653		mychecksedad	Let's Win the Election (JOI22_ho_t3)	C++17	0 / 100	1060 ms	1048580 KiB

Main

/* Author : Mychecksdead  */
#include<bits/stdc++.h>
using namespace std;
#define ll long long int
#define MOD (1000000000+7)
#define MOD1 (998244353)
#define pb push_back
#define all(x) x.begin(), x.end()
#define en cout << '\n'
const int N = 500+100, M = 1e5+10, K = 52, MX = 30;


int n, k, sum[N][N];
array<int, 2> a[N];
double dp[N][N][N];


void solve(){
  cin >> n >> k;
  for(int i = 1; i <= n; ++i){
    cin >> a[i][1] >> a[i][0];
    if(a[i][0] == -1) a[i][0] = MOD;
  }
  sort(a+1, a+1+n);

  for(int j = 0; j <= n; ++j) sum[n+1][j] = 0;
  for(int i = n; i >= 1; --i){
    for(int j = 0; j < n - i + 1; ++j){
      sum[i][j] = min(sum[i + 1][j], j == 0 ? MOD : sum[i + 1][j - 1] + a[i][1]);
    }
    sum[i][n - i + 1] = sum[i + 1][n - i] + a[i][1];
  }
  double ans = sum[1][k];

  for(int i = 0; i <= n; ++i) for(int j = 0; j <= n; ++j) for(int l = 0; l <= n; ++l) dp[i][j][l] = MOD;
  for(int i = 1; i <= n; ++i) dp[0][0][i] = 0;
  
  for(int l = 1; l <= k; ++l){ // collabnum
    for(int i = 1; i <= k; ++i){
      if(a[i][0] == MOD) break;

      dp[i][0][l] = dp[i - 1][0][l] + a[i][1];
   
      for(int j = 1; j <= min(i, l); ++j){
        dp[i][j][l] = min(dp[i - 1][j][l] + a[i][1] / (double) (j+1), dp[i - 1][j - 1][l] + a[i][0] / (double) j);
      }
    }
    for(int i = 1; i <= k; ++i)
      ans = min(ans, dp[i][l][l] + sum[i + 1][k - i] / (double) (l + 1));
  }

  // for(int i = 1; i <= n; ++i){
  //   for(int j = 0; j <= i; ++j) cout << dp[i][j].first << ' ' << dp[i][j].second << " | ";
  //   en;
  // }

  cout << fixed << setprecision(15);
  cout << ans;
}


int main(){
  cin.tie(0); ios::sync_with_stdio(0);
  int tt = 1, aa;
  // freopen("in.txt", "r", stdin);
  // freopen("out.txt", "w", stdout);
  while(tt--){
    solve();
    en;
  }
  cerr<<"time taken : "<<(float)clock()/CLOCKS_PER_SEC<<" seconds\n";
  return 0;
} 

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:64:15: warning: unused variable 'aa' [-Wunused-variable]
   64 |   int tt = 1, aa;
      |               ^~

• Subtask 1: 0 / 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