oj.uz

Submission #937967

# Submission time Handle Problem Language Result Execution time Memory
937967 2024-03-04T17:19:13 Z Litusiano Let's Win the Election (JOI22_ho_t3) C++17
11 / 100
 795 ms 508 KB 
#include<bits/stdc++.h>
using namespace std;
#define int long long
#define endl "\n"
const int INF = 1e18;
mt19937 rng((unsigned int) chrono::steady_clock::now().time_since_epoch().count());

bool cmp(pair<int,int> a, pair<int,int> b){
	if(a.second == b.second) return a.first < b.first;
	return a.second-a.first < b.second-b.first;
}

void shuffle(vector<pair<int,int>>& v){
	int n = v.size();
	for(int i = 0; i<3*n; i++){
		int a = rng()%n; int b = rng()%n;
		swap(v[a],v[b]);
	}
 
}

signed main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout<<setprecision(3)<<fixed;
	int n,k1; cin>>n>>k1;

	vector<pair<int,int>> v(n);
	for(int i = 0; i<n; i++){
		cin>>v[i].first>>v[i].second;
		if(v[i].second == -1) v[i].second = INF;
	}
	if(n > 20){
		sort(v.begin(),v.end());
		long double ans = 0;
		int cnt = 0;
		for(auto x : v){
			ans+=(1.0*x.first/(cnt+1));
			if(x.second != INF) cnt++;
		}
		return 0;
	}
	sort(v.begin(),v.end(),cmp);
	int q = 13000;
	long double ans = INF;
	while(q--){
		shuffle(v);
		long double dp[n+1][k1+1][k1+1];
		for(int i = 0; i<=n; i++){
			for(int j = 0; j<=k1; j++){
				for(int k = 0; k<=k1; k++) dp[i][j][k] = 1.0*INF;
			}
		}
		dp[0][0][0] = 0; // first i, j votes, k representants
		for(int i = 1; i<=n; i++){
			for(int j = 0; j<=k1; j++){
				for(int k = 0; k<=k1; k++){
					dp[i][j][k] = dp[i-1][j][k];
					if(!j) continue;
					long double act = dp[i-1][j-1][k]; // just speech for vote
					act+= 1.0*v[i-1].first/(k+1);
					dp[i][j][k] = min(dp[i][j][k],act);
					if(!k || v[i-1].second == INF) continue;
					act = dp[i-1][j-1][k-1];
					act+= 1.0*v[i-1].second / k;
					dp[i][j][k] = min(dp[i][j][k],act);
				}
			}
		}
		for(int k = 0; k<=k1; k++){
			ans = min(ans, dp[n][k1][k]);
		}
	}
	cout<<ans<<endl;
}

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 344 KB Output is correct
2 Correct 6 ms 348 KB Output is correct
3 Correct 8 ms 348 KB Output is correct
4 Correct 15 ms 460 KB Output is correct
5 Incorrect 0 ms 348 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #2
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 344 KB Output is correct
2 Correct 6 ms 348 KB Output is correct
3 Correct 8 ms 348 KB Output is correct
4 Correct 15 ms 460 KB Output is correct
5 Incorrect 0 ms 348 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #3
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 348 KB Output is correct
2 Correct 20 ms 348 KB Output is correct
3 Correct 27 ms 344 KB Output is correct
4 Correct 40 ms 464 KB Output is correct
5 Correct 57 ms 436 KB Output is correct
6 Correct 74 ms 436 KB Output is correct
7 Correct 95 ms 444 KB Output is correct
8 Correct 56 ms 344 KB Output is correct
9 Correct 56 ms 344 KB Output is correct
10 Correct 56 ms 348 KB Output is correct
11 Correct 56 ms 348 KB Output is correct
12 Correct 57 ms 344 KB Output is correct
13 Correct 55 ms 344 KB Output is correct
14 Correct 41 ms 348 KB Output is correct
15 Correct 95 ms 436 KB Output is correct

Subtask #4
0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 348 KB Output is correct
2 Correct 20 ms 348 KB Output is correct
3 Correct 27 ms 344 KB Output is correct
4 Correct 40 ms 464 KB Output is correct
5 Correct 57 ms 436 KB Output is correct
6 Correct 74 ms 436 KB Output is correct
7 Correct 95 ms 444 KB Output is correct
8 Correct 56 ms 344 KB Output is correct
9 Correct 56 ms 344 KB Output is correct
10 Correct 56 ms 348 KB Output is correct
11 Correct 56 ms 348 KB Output is correct
12 Correct 57 ms 344 KB Output is correct
13 Correct 55 ms 344 KB Output is correct
14 Correct 41 ms 348 KB Output is correct
15 Correct 95 ms 436 KB Output is correct
16 Correct 77 ms 440 KB Output is correct
17 Correct 442 ms 344 KB Output is correct
18 Correct 395 ms 468 KB Output is correct
19 Correct 795 ms 508 KB Output is correct
20 Incorrect 761 ms 496 KB Output isn't correct
21 Halted 0 ms 0 KB -

Subtask #5
0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 348 KB Output is correct
2 Correct 20 ms 348 KB Output is correct
3 Correct 27 ms 344 KB Output is correct
4 Correct 40 ms 464 KB Output is correct
5 Correct 57 ms 436 KB Output is correct
6 Correct 74 ms 436 KB Output is correct
7 Correct 95 ms 444 KB Output is correct
8 Correct 56 ms 344 KB Output is correct
9 Correct 56 ms 344 KB Output is correct
10 Correct 56 ms 348 KB Output is correct
11 Correct 56 ms 348 KB Output is correct
12 Correct 57 ms 344 KB Output is correct
13 Correct 55 ms 344 KB Output is correct
14 Correct 41 ms 348 KB Output is correct
15 Correct 95 ms 436 KB Output is correct
16 Correct 77 ms 440 KB Output is correct
17 Correct 442 ms 344 KB Output is correct
18 Correct 395 ms 468 KB Output is correct
19 Correct 795 ms 508 KB Output is correct
20 Incorrect 761 ms 496 KB Output isn't correct
21 Halted 0 ms 0 KB -

Subtask #6
0 / 11.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 344 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 344 KB Output is correct
2 Correct 6 ms 348 KB Output is correct
3 Correct 8 ms 348 KB Output is correct
4 Correct 15 ms 460 KB Output is correct
5 Incorrect 0 ms 348 KB Output isn't correct
6 Halted 0 ms 0 KB -