Submission #1026994

#	Time	Username	Problem	Language	Result	Execution time	Memory
1026994		vjudge1	Sure Bet (CEOI17_sure)	C++14	100 / 100	74 ms	3564 KiB

sure

#pragma GCC optimize("O3,unroll-loops")
#include <bits/stdc++.h>
using namespace std;
#define name "aaaaaa"
using ll = long long;
using pii = pair<int, int>;
using ld = long double;


void file(){
	ios_base::sync_with_stdio(0); cin.tie(0);
    if(fopen(name".inp", "r")) {
        freopen(name".inp", "r", stdin);
        freopen(name".out", "w", stdout);
    }
}

const int maxn = 1e5 + 5;

ld a[maxn], b[maxn];

void solve (){
	int n; cin >> n;
	for(int i = 1; i <= n; i++){
		cin >> a[i] >> b[i];
	}
	sort(a + 1, a + n + 1);
	sort(b + 1, b + n + 1);
	ld suma = 0, sumb = 0, ans = 0;
	int p1 = n, p2 = n;
	while(1){
		if(p1 == -1 || p2 == -1) break;
		if(suma < sumb){
			suma += a[p1];
			p1--;
		}else{
			sumb += b[p2];
			p2--;
		}
		ans = max(ans, min(suma, sumb) - (n - p1) - (n - p2));
	}
	cout << fixed << setprecision(4) << ans;
}

int main(){
    file(); 
    solve();
}

Compilation message (stderr)

sure.cpp: In function 'void file()':
sure.cpp:13:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |         freopen(name".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
sure.cpp:14:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |         freopen(name".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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