Submission #498375

#	Time	Username	Problem	Language	Result	Execution time	Memory
498375		mansur	Sure Bet (CEOI17_sure)	C++17	100 / 100	113 ms	3716 KiB

sure

#include<bits/stdc++.h>	
/* 
#pragma optimize ("g",on)
#pragma GCC optimize ("inline")
#pragma GCC optimize ("Ofast")
#pragma GCC optimize ("unroll-loops")
#pragma GCC optimize ("03")
#pragma GCC target ("sse,sse2,sse3,ssse3,sse4,popcnt,abm,avx2,mmx,fma,avx,tune=native")
#pragma comment(linker, "/stack:200000000")
*/ 
//01001101 01100001 01101011 01101000 01100001  01100111 01100001 01111001 
 
using namespace std;
 
#define all(a) a.begin(), a.end()                                                   
#define rall(a) a.rbegin(), a.rend()
#define ll long long
#define pb push_back
#define sz(a) a.size()
#define nl '\n'
#define popb pop_back()                                                                   
#define ld double
#define ull unsigned long long
#define ff first                                         
#define ss second  
#define fix fixed << setprecision
#define pii pair<int, int>                          
#define E exit (0)
#define int long long
 
const int inf = 1e15, N = 2e5 + 5, mod = 998244353;                    
 
vector<pii> dir = {{1, 0}, {0, 1}, {-1, 0}, {0, -1}};

main() {                                                         
	//freopen("triangles.in", "r", stdin);                                                                                     
	//freopen("triangles.out", "w", stdout);                                                                                     
	ios_base::sync_with_stdio(NULL);                                                                                        
	cin.tie(NULL);
	int n;
	cin >> n;
	vector<double> a, b;
	for (int i = 1; i <= n; i++) {
		double x, y;
		cin >> x >> y;
		a.pb(x);
		b.pb(y);
	}
	sort(rall(a));
	sort(rall(b));
	double prefa[n + 1], prefb[n + 1];
	prefa[0] = prefb[0] = 0;
	for (int i = 1; i <= n; i++) {
		prefa[i] = prefa[i - 1] + a[i - 1];
		prefb[i] = prefb[i - 1] + b[i - 1];
	}
	double ans = 0;
	for (int t = 1; t <= n * 2; t++) {
		int l = 0, r = min(n, t);
		double cur = 0;
		while (l <= r) {
			int mid = (l + r) / 2;
			if (prefa[mid] <= prefb[min(n, t - mid)]) {
				l = mid + 1;
				cur = prefa[mid];
			}else r = mid - 1;
        }
        ans = max(ans, cur - t * 1.0);
        l = 0, r = min(n, t);
		cur = 0;
		while (l <= r) {
			int mid = (l + r) / 2;
			if (prefb[mid] <= prefa[min(n, t - mid)]) {
				l = mid + 1;
				cur = prefb[mid];
			}else r = mid - 1;
        }
        ans = max(ans, cur - t * 1.0);
	}
	cout << fix(4) << ans;
}

Compilation message (stderr)

sure.cpp:35:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   35 | main() {
      | ^~~~

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