Submission #491111

#	Time	Username	Problem	Language	Result	Execution time	Memory
491111		hollwo_pelw	Sure Bet (CEOI17_sure)	C++17	100 / 100	92 ms	3600 KiB

sure

/*
// is short or still long ???
hollwo_pelw's template(short)
// Note : -Dhollwo_pelw_local
*/

#include <bits/stdc++.h>
// #include <ext/pb_ds/assoc_container.hpp>
// #include <ext/pb_ds/trie_policy.hpp>
// #include <ext/rope>

using namespace std;
// using namespace __gnu_pbds;
// using namespace __gnu_cxx;

void FAST_IO(string filein = "", string fileout = "", string fileerr = ""){
	if (fopen(filein.c_str(), "r")){
		freopen(filein.c_str(), "r", stdin);
		freopen(fileout.c_str(), "w", stdout);
#ifdef hollwo_pelw_local
		freopen(fileerr.c_str(), "w", stderr);
#endif
	}
	cin.tie(0), cout.tie(0) -> sync_with_stdio(0);
}

void Hollwo_Pelw();

signed main(){
#ifdef hollwo_pelw_local
	FAST_IO("input.inp", "output.out", "error.err");
	auto start = chrono::steady_clock::now();
#else
	FAST_IO("D.inp", "D.out");
#endif
	int testcases = 1;
	// cin >> testcases;
	for (int test = 1; test <= testcases; test++){
		// cout << "Case #" << test << ": ";
		Hollwo_Pelw();
	}
#ifdef hollwo_pelw_local
	auto end = chrono::steady_clock::now();
	cout << "\nExcution time : " << chrono::duration_cast<chrono::milliseconds> (end - start).count() << "[ms]" << endl;
#endif
	return 0;
}

const int N = 1e5 + 5;

int n;
double a[N], b[N], res = 0;

void Hollwo_Pelw() {
	cin >> n;
	for (int i = 1; i <= n; i++)
		cin >> a[i] >> b[i];
	sort(a + 1, a + n + 1, greater<double>());
	sort(b + 1, b + n + 1, greater<double>());

	double sa = 0, sb = 0, cur = 0;
	for (int i = 0, j = 0; i <= n; i++) {
		sa += a[i];
		while (j < n && sb + b[j + 1] < sa) {
			sb += b[++ j];
			cur = max(cur, sb - j);
		}
		res = max(res, cur - i);
		if (j < n)
			res = max(res, sa - i - j - 1);
	}
	cout << fixed << setprecision(4) << res;
}

Compilation message (stderr)

sure.cpp: In function 'void FAST_IO(std::string, std::string, std::string)':
sure.cpp:18:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |   freopen(filein.c_str(), "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
sure.cpp:19:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |   freopen(fileout.c_str(), "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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