Submission #939858

#	Time	Username	Problem	Language	Result	Execution time	Memory
939858		TAhmed33	Let's Win the Election (JOI22_ho_t3)	C++98	0 / 100	466 ms	766316 KiB

Main

#include <bits/stdc++.h>
using namespace std;
typedef long double ld;
int n, k, a[501], b[501];
ld dp[1 << 20][23];
ld recurse (int mask, int c, int l) {
	if (l == k) return 0;
	ld &ret = dp[mask][c];
	if (ret == ret) return ret;
	ret = 1e18;
	for (int i = 0; i < n; i++) {
		if (mask & (1 << i)) continue;
		ret = min(ret, 1.0 * a[i] / c + recurse(mask ^ (1 << i), c, l + 1));
	}
	int pos = -1;
	for (int i = 0; i < n; i++) {
		if (mask & (1 << i)) continue;
		if (b[i] == -1) continue;
		if (pos == -1 || b[i] < b[pos]) pos = i;
	}
	if (pos != -1) {
		ret = min(ret, 1.0 * b[pos] / c + recurse(mask ^ (1 << pos), c + 1, l + 1));
	}
	return ret;
}
int main () {
	memset(dp, -1, sizeof(dp));
	cin >> n >> k;
	for (int i = 0; i < n; i++) cin >> a[i] >> b[i];
	cout << fixed << setprecision(9) << recurse(0, 1, 0) << '\n';
}

• 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