Submission #924313

#	Time	Username	Problem	Language	Result	Execution time	Memory
924313		OAleksa	Let's Win the Election (JOI22_ho_t3)	C++14	56 / 100	2572 ms	1007696 KiB

Main

#include <bits/stdc++.h>
using namespace std;
#define f first
#define s second
#define int long long
const int N = 510;
int n, x;
pair<int, int> a[N];
double dp[N][N][N];
signed main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  int tt = 1;
  //cin >> tt;
  while (tt--) {
  	cin >> n >> x;
  	for (int i = 1;i <= n;i++) {
  		cin >> a[i].f >> a[i].s;
  		if (a[i].s == -1)
  			a[i].s = 1e9;
  	}
  	sort(a + 1, a + n + 1, [&](pair<int, int> x, pair<int, int> y) {
  		return x.s < y.s;
  	});
  	//prvih i, dobio sam j glasova, k ljudi ucestvuje
  	double ans = 1e9;
  	for (int s = 1;s <= n;s++) {
  		for (int i = 0;i <= n;i++) {
  			for (int j = 0;j <= n;j++) {
  				for (int k = 0;k <= n;k++)
  					dp[i][j][k] = 1e9;
  			}
  		}
  		for (int i = 0;i <= n;i++) 
  			dp[i][0][1] = 0;
	  	for (int i = 1;i <= n;i++) {
	  		for (int j = 1;j <= n;j++) {
	  			if (i == j) {
		  			for (int k = 1;k <= n;k++) {
		  				dp[i][j][k] = dp[i - 1][j][k];
		  				dp[i][j][k] = min(dp[i][j][k], dp[i - 1][j - 1][k] + (double)a[i].f / s);
		  				if (k > 1)
		  					dp[i][j][k] = min(dp[i][j][k], dp[i - 1][j - 1][k - 1] + (double)a[i].s / (k - 1));
		  			}
	  			}
	  			else {
	  				dp[i][j][s] = min(dp[i][j][s], dp[i - 1][j][s]);
	  				dp[i][j][s] = min(dp[i][j][s], dp[i - 1][j - 1][s] + (double)a[i].f / s);
	  			}
	  		}
	  	}
	  	ans = min(ans, dp[n][x][s]);
  	}
  	cout << fixed << setprecision(15) << ans;
  }
  return 0;
}

• 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