Submission #1264631

#	Time	Username	Problem	Language	Result	Execution time	Memory
1264631		mingga	Sure Bet (CEOI17_sure)	C++20	100 / 100	54 ms	2228 KiB

sure

// Author: caption_mingle
#include "bits/stdc++.h"

using namespace std;

#define ln "\n"
#define pb push_back
#define fi first
#define se second
#define all(x) (x).begin(), (x).end()
#define sz(x) ((int)(x).size())
#define ll long long
const int mod = 1e9 + 7;
const int inf = 2e9;
int n;

signed main() {
	cin.tie(0) -> sync_with_stdio(0);
	#define task ""
	if(fopen(task ".INP", "r")) {
		freopen(task ".INP", "r", stdin);
		freopen(task ".OUT", "w", stdout);
	}
	cin >> n;
	priority_queue<double> q1, q2;
	for(int i = 1; i <= n; i++) {
		double a, b; cin >> a >> b;
		q1.push(a);
		q2.push(b);
	}
	double cur1 = 0, cur2 = 0;
	double ans = 0;
	for(int i = 1; i <= 2 * n; i++) {
		if(cur1 < cur2) {
			if(q1.empty()) break;
			cur1 += q1.top() - 1;
			q1.pop();
			cur2 -= 1;
		} else {
			if(q2.empty()) break;
			cur2 += q2.top() - 1;
			q2.pop();
			cur1 -= 1;
		}
		ans = max(ans, min(cur1, cur2));
	}
	cout << setprecision(4) << fixed;
	cout << ans << ln;
    cerr << "\nTime: " << clock() * 1000 / CLOCKS_PER_SEC;
}

Compilation message (stderr)

sure.cpp: In function 'int main()':
sure.cpp:21:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   21 |                 freopen(task ".INP", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
sure.cpp:22:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |                 freopen(task ".OUT", "w", stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

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