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Submission #200179

# Submission time Handle Problem Language Result Execution time Memory
200179 2020-02-05T15:39:17 Z alishahali1382 Sure Bet (CEOI17_sure) C++14
100 / 100
 1205 ms 5368 KB 
#include <bits/stdc++.h>
#pragma GCC optimize ("O2")
#pragma GCC optimize ("unroll-loops")
//#pragma GCC optimize("no-stack-protector,fast-math")

using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<pii, int> piii;
typedef pair<ll, ll> pll;
#define debug(x) cerr<<#x<<'='<<(x)<<endl;
#define debugp(x) cerr<<#x<<"= {"<<(x.first)<<", "<<(x.second)<<"}"<<endl;
#define debug2(x, y) cerr<<"{"<<#x<<", "<<#y<<"} = {"<<(x)<<", "<<(y)<<"}"<<endl;
#define debugv(v) {cerr<<#v<<" : ";for (auto x:v) cerr<<x<<' ';cerr<<endl;}
#define all(x) x.begin(), x.end()
#define pb push_back
#define kill(x) return cout<<x<<'\n', 0;

const ld eps=1e-7;
const int inf=1000000010;
const ll INF=10000000000000010LL;
const int mod = 1000000007;
const int MAXN = 100010, LOG=20;

int n, m, k, u, v, x, y, t, a, b;
ld A[MAXN];
ld B[MAXN];

int get(ld val){
	if (val>min(A[n], B[n])) return inf;
	int x=lower_bound(A, A+n+1, val)-A;
	int y=lower_bound(B, B+n+1, val)-B;
	return x+y;
}

int main(){
	ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
	//freopen("input.txt", "r", stdin);
	//freopen("output.txt", "w", stdout);
	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);
	reverse(A+1, A+n+1);
	reverse(B+1, B+n+1);
	for (int i=2; i<=n; i++) A[i]+=A[i-1], B[i]+=B[i-1];
	
	ld ans=0;
	for (int i=1; i<=2*n; i++){
		ld dwn=0, up=min(A[n], B[n]);
		while (up-dwn>1e-5){
			ld mid=(dwn+up)/2;
			if (get(mid)>i) up=mid;
			else dwn=mid;
		}
		ans=max(ans, dwn-i);
	}
	cout<<setprecision(4)<<fixed<<ans<<'\n';
	
	return 0;
}

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 376 KB Output is correct
2 Correct 5 ms 380 KB Output is correct
3 Correct 5 ms 376 KB Output is correct
4 Correct 5 ms 376 KB Output is correct
5 Correct 5 ms 376 KB Output is correct
6 Correct 5 ms 376 KB Output is correct

Subtask #2
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 376 KB Output is correct
2 Correct 5 ms 380 KB Output is correct
3 Correct 5 ms 376 KB Output is correct
4 Correct 5 ms 376 KB Output is correct
5 Correct 5 ms 376 KB Output is correct
6 Correct 5 ms 376 KB Output is correct
7 Correct 6 ms 376 KB Output is correct
8 Correct 6 ms 376 KB Output is correct
9 Correct 5 ms 376 KB Output is correct
10 Correct 6 ms 380 KB Output is correct
11 Correct 5 ms 376 KB Output is correct
12 Correct 11 ms 376 KB Output is correct
13 Correct 12 ms 380 KB Output is correct
14 Correct 15 ms 376 KB Output is correct
15 Correct 11 ms 376 KB Output is correct
16 Correct 13 ms 408 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 376 KB Output is correct
2 Correct 5 ms 380 KB Output is correct
3 Correct 5 ms 376 KB Output is correct
4 Correct 5 ms 376 KB Output is correct
5 Correct 5 ms 376 KB Output is correct
6 Correct 5 ms 376 KB Output is correct
7 Correct 6 ms 376 KB Output is correct
8 Correct 6 ms 376 KB Output is correct
9 Correct 5 ms 376 KB Output is correct
10 Correct 6 ms 380 KB Output is correct
11 Correct 5 ms 376 KB Output is correct
12 Correct 11 ms 376 KB Output is correct
13 Correct 12 ms 380 KB Output is correct
14 Correct 15 ms 376 KB Output is correct
15 Correct 11 ms 376 KB Output is correct
16 Correct 13 ms 408 KB Output is correct
17 Correct 978 ms 4908 KB Output is correct
18 Correct 981 ms 4984 KB Output is correct
19 Correct 1014 ms 4892 KB Output is correct
20 Correct 984 ms 4976 KB Output is correct
21 Correct 1198 ms 5240 KB Output is correct
22 Correct 982 ms 4892 KB Output is correct
23 Correct 997 ms 4984 KB Output is correct
24 Correct 1016 ms 4888 KB Output is correct
25 Correct 973 ms 4856 KB Output is correct
26 Correct 1205 ms 5368 KB Output is correct