Submission #733717

#	Time	Username	Problem	Language	Result	Execution time	Memory
733717		shoryu386	Let's Win the Election (JOI22_ho_t3)	C++17	56 / 100	496 ms	1048576 KiB

Main

#include <bits/stdc++.h>
using namespace std;

#define int long long
#define db long double

#define MAX 502
db dp[MAX][MAX][MAX];
int n, k;
 
pair<db, db> info[MAX];

int maxcolab;
 
bool cmp(pair<db, db> a, pair<db, db> b){
	if (a.second == -1) a.second = 1000000000;
	if (b.second == -1) b.second = 1000000000;
	
	return a.second < b.second;
	
}
 
db recur(int idx, int colabCount, int voteCount){
	#define cringe info
	if (idx == n && voteCount >= k && maxcolab == colabCount) return 0;
	else if (idx == n) return 1000000000;
	
	if (dp[idx][colabCount][voteCount] != -1) return dp[idx][colabCount][voteCount];
	if (cringe[idx].second == -1) return dp[idx][colabCount][voteCount] = min(recur(idx+1, colabCount, voteCount), recur(idx+1, colabCount, voteCount+1) + cringe[idx].first/maxcolab);
	return dp[idx][colabCount][voteCount] = min({recur(idx+1, colabCount, voteCount), recur(idx+1, colabCount, voteCount+1) + cringe[idx].first/maxcolab, recur(idx+1, colabCount+1, voteCount+1) + cringe[idx].second/colabCount});
}

db query(int x){
	for (int a = 0; a <= n; a++) for (int y = 0; y <= n+1; y++) for (int z = 0; z <= n; z++) dp[a][y][z] = -1;
	maxcolab = x;
	return recur(0, 1, 0);
}

signed main(){

	cin >> n >> k;
	
	for (int x = 0; x < n; x++) cin >> info[x].first >> info[x].second;
	
	sort(info, info+n, cmp);
	db ans = 1000000000000000LL;
	int l = 1, r = n+1;
	while (r - l >= 3){
		int m1 = l + (r-l)/3;
		int m2 = r - (r-l)/3;
		
		if (query(m1) > query(m2)){
			l = m1;
		}
		else{
			r = m2;
		}
	}
	for (int i = l; i <= r; i++){
		ans = min(ans, query(i));
	}

	cout << std::setprecision(9) << ans;
}

• 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