Submission #51385

#	Time	Username	Problem	Language	Result	Execution time	Memory
51385		adamczh1	Sure Bet (CEOI17_sure)	C++17	60 / 100	182 ms	2256 KiB

sure

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

const int MAXN = 1e5 + 5;

int n;
double a[MAXN], b[MAXN];

int main() {
	scanf("%d", &n);
	for (int i = 0; i < n; i++) {
		scanf("%lf %lf", &a[i], &b[i]);
	}
	sort(a, a + n);
	reverse(a, a + n);
	sort(b, b + n);
	reverse(b, b + n);
	double lo = 0;
	double hi = 2e9;
	for (int iter = 0; iter < 200; iter++) {
		double mid = (lo + hi) / 2;
		double x = 0, y = 0;
		int ai = 0, bi = 0;
		while (ai < n || bi < n) {
			if (x < mid) {
				x += a[ai++] - 1;
				y--;
			}
			if (y < mid) {
				x--;
				y += b[bi++] - 1;
			}
			if (x >= mid && y >= mid) {
				break;
			}
		}
		if (x >= mid && y >= mid) {
			lo = mid;
		} else {
			hi = mid;
		}
	}
	printf("%.4lf", lo);
	return 0;
}

Compilation message (stderr)

sure.cpp: In function 'int main()':
sure.cpp:10:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ~~~~~^~~~~~~~~~
sure.cpp:12:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lf %lf", &a[i], &b[i]);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 40 / 40
• Subtask 3: 0 / 40