Submission #1018930

#	Time	Username	Problem	Language	Result	Execution time	Memory
1018930		JuliaTatad	Sure Bet (CEOI17_sure)	C++17	100 / 100	106 ms	6036 KiB

sure

#include <iostream>
#include <vector>
#include <cmath>
#include <algorithm>

using namespace std;

double MAX(double a, double b) {
	if (a > b) {
		return a;
	}
	return b;
}

double MIN(double a, double b) {
	if (a < b) {
		return a;
	}
	return b;
}

int main() {
	int n; cin >> n; double profit = 0;
	vector<double> a(n); vector<double> b(n);
	for (int i = 0; i < n; i++) {
		cin >> a[i]; cin >> b[i];
	}
	sort(a.begin(), a.end()); reverse(a.begin(), a.end()); sort(b.begin(), b.end()); reverse(b.begin(), b.end());

	vector<double> pa(n); vector<double> pb(n);
	pa[0] = a[0]; pb[0] = b[0];
	for (int i = 1; i < n; i++) {
		pa[i] = pa[i - 1] + a[i]; pb[i] = pb[i - 1] + b[i];
	}

	vector<int> x(n); vector<int> y(n);
	int j = 0;
	for (int i = 0; i < n; i++) {
		while (j < n && pa[i] > pb[min(n-1, j)]) {
			j++;
		}
		x[i] = j;
		//cout << "x[" << i << "] = " << x[i] << endl;
	}
	j = 0;
	for (int i = 0; i < n; i++) {
		while (j < n && pb[i] > pa[min(n - 1, j)]) {
			j++;
		}
		y[i] = j;
	}

	for (int i = 0; i < n; i++) {
		if (x[i] <= n - 1) {
			profit = MAX(profit, pa[i] - i - x[i] - 2);
		}
		if (y[i] <= n - 1) {
			profit = MAX(profit, pb[i] - i - y[i] - 2);
		}
	}
	

	printf("%.4lf", (double)profit);
}

• Subtask 1: 20 / 20
• Subtask 2: 40 / 40
• Subtask 3: 40 / 40