Submission #526356

#	Time	Username	Problem	Language	Result	Execution time	Memory
526356		model_code	Let's Win the Election (JOI22_ho_t3)	C++17	11 / 100	408 ms	2276 KiB

Main

#include <iostream>
#include <algorithm>
using namespace std;

struct Election {
	int a, b;
};

bool operator<(const Election &a1, const Election &a2) {
	if (a1.b < a2.b) return true;
	if (a1.b > a2.b) return false;
	if (a1.a < a2.a) return true;
	return false;
}

int N, K;
Election X[509];
double dp[509][509]; // (pos, cooperator)

double solve(int Goal) {
	// Initialize [1]
	for (int i = 0; i <= N; i++) {
		for (int j = 0; j <= N; j++) dp[i][j] = 1e9;
	}
	
	// Dynamic Programming
	dp[0][0] = 0;
	for (int i = 1; i <= N; i++) {
		for (int j = 0; j <= N; j++) {
			if (dp[i - 1][j] > 1e8) continue;
			dp[i][j + 0] = min(dp[i][j + 0], dp[i - 1][j] + 1.0 * X[i].a / (Goal + 1));
			if (X[i].b != -1) {
				dp[i][j + 1] = min(dp[i][j + 1], dp[i - 1][j] + 1.0 * X[i].b / (j + 1));
			}
		}
	}
	
	// Return Value
	return dp[N][Goal];
}

int main() {
	// Step #1. Input
	cin >> N;
	cin >> K;
	for (int i = 1; i <= N; i++) {
		cin >> X[i].a >> X[i].b;
		if (X[i].b == -1) X[i].b = 1000000;
	}
	
	// Step #2. Sorting
	sort(X + 1, X + N + 1);
	
	// Step #3. Brute Force
	double Answer = 1e9;
	for (int i = 0; i <= K; i++) {
		double ret = solve(i);
		Answer = min(Answer, ret);
	}
	
	// Step #4. Output
	printf("%.15lf\n", Answer);
	return 0;
}

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