Submission #163347

#	Time	Username	Problem	Language	Result	Execution time	Memory
163347		Knps4422	Sure Bet (CEOI17_sure)	C++14	100 / 100	250 ms	5240 KiB

sure

#include<bits/stdc++.h>
#define rc(x) return cout<<x<<endl,0
#define pb push_back
#define mkp make_pair
#define in insert
#define er erase
#define fd find
#define fr first
#define sc second
typedef long long ll;
typedef long double ld;
const int mod=1e9+7;
using namespace std;

int n;
double a[100005], b[100005];
double sum_a[100005], sum_b[100005];
int main(){	
	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 = 1; i <= n; i++){
		sum_a[i] = sum_a[i-1] + a[i];
		sum_b[i] = sum_b[i-1] + b[i];
	}
	double answer = 0;
	for(int i = 1; i <= n ; i++){
		int l = 1, r = n;
		while(l < r){
			int mid = (l+r)/2;
			if(sum_b[mid] >= sum_a[i]){
				r = mid;
			}else{
				l = mid + 1;
			}
		} 
		//cout << i << ' ' << l << '\n';
		answer = max(answer,
			min(sum_a[i]-i-l,sum_b[l]-i-l));
		answer = max(answer,
			min(sum_a[i]-i-l+1,sum_b[l-1]-i-l+1));

	}
	printf("%.4lf",(double)answer);
}

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