Submission #501279

#	Time	Username	Problem	Language	Result	Execution time	Memory
501279		Ziel	Sure Bet (CEOI17_sure)	C++17	100 / 100	86 ms	3628 KiB

sure

/**
 * LES GREATEABLES BRO TEAM
**/

#include <bits/stdc++.h>

using namespace std;

using ll = long long;
#define sz(x) (int)x.size()
const bool FLAG = false;
void setIO(const string &f = "");

void solve() {
    int n;
    cin >> n;
    vector<double> a(n + 1), b(n + 1);
    for (int i = 1; i <= n; i++) {
    	cin >> a[i] >> b[i];
    }
    sort(a.begin() + 1, a.end(), greater<double>());
    sort(b.begin() + 1, b.end(), greater<double>());
	for (int i = 1; i <= n; i++) {
		a[i] += a[i - 1];
		b[i] += b[i - 1];
	}

	double aa = 0, bb = 0;
	for (int i = 1; i <= n; i++) {
		int lo = 1, hi = n, idx = 0;
		while (hi >= lo) {
			int mid = (lo + hi) / 2;
			if (a[mid] <= b[i])
				lo = mid + 1, idx = mid;
			else
				hi = mid - 1;
		}
		if (min(a[idx] - i - idx, b[i] - i - idx) > min(aa, bb)) {
			aa = a[idx] - i - idx;
			bb = b[i] - i - idx;
		}
	}
	for (int i = 1; i <= n; i++) {
		int lo = 1, hi = n, idx = 0;
		while (hi >= lo) {
			int mid = (lo + hi) / 2;
			if (b[mid] <= a[i])
				lo = mid + 1, idx = mid;
			else
				hi = mid - 1;
		}
		if (min(a[i] - i - idx, b[idx] - i - idx) > min(aa, bb)) {
			aa = a[i] - i - idx;
			bb = b[idx] - i - idx;
		}
	}
	cout << fixed << setprecision(4) << min(aa, bb);
}

signed main() {
    setIO();
    
    int tt = 1;
    if (FLAG) {
    	cin >> tt;
    }
    while (tt--) {
    	solve();
    }
    
    return 0;
}

void setIO(const string &f) {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    if (fopen((f + ".in").c_str(), "r")) {
        freopen((f + ".in").c_str(), "r", stdin);
        freopen((f + ".out").c_str(), "w", stdout);
    }
}

Compilation message (stderr)

sure.cpp: In function 'void setIO(const string&)':
sure.cpp:78:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   78 |         freopen((f + ".in").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
sure.cpp:79:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   79 |         freopen((f + ".out").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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