Submission #582097

#	Time	Username	Problem	Language	Result	Execution time	Memory
582097		amunduzbaev	Boarding Passes (BOI22_passes)	C++17	0 / 100	0 ms	212 KiB

passes

#include "bits/stdc++.h"
using namespace std;
 
#define ar array
typedef int64_t ll;
#define int ll

const int N = 1e5 + 5;
int pref[N], suff[N];

signed main(){
	ios::sync_with_stdio(0); cin.tie(0);
	
	//~ string s; cin>>s;
	//~ int n = s.size();
	int n; cin>>n;
	for(int i=0;i<n;i++){
		if(i) pref[i] += pref[i-1];
		pref[i] += i;
	}
	
	for(int i=n-1;~i;i--){
		suff[i] += suff[i+1];
		suff[i] += (n - i - 1);
	}
	
	int res = pref[n-1];
	for(int i=1;i<n;i++){
		res = min(res, pref[i-1] + suff[i]);
	}
	
	double rr = res / 2.;
	cout<<fixed<<setprecision(1)<<rr<<"\n";
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 25
• Subtask 3: 0 / 30
• Subtask 4: 0 / 40