Submission #612260

#	Time	Username	Problem	Language	Result	Execution time	Memory
612260		balbit	Seesaw (JOI22_seesaw)	C++14	0 / 100	1 ms	328 KiB

seesaw

#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define pii pair<int, int>
#define f first
#define s second

#define REP(i,n) for (int i = 0; i<n; ++i)
#define REP1(i,n) for(int i = 1; i<=n; ++i)
#define MX(a,b) a = max(a,b)
#define MN(a,b) a = min(a,b)
#define pb push_back
#define SZ(x) (int)((x).size())
#define ALL(x) (x).begin(),(x).end()
#ifdef BALBIT
#define bug(...) cerr<<"#"<<__LINE__<<" "<<#__VA_ARGS__<<"- ", _do(__VA_ARGS__)
template<typename T> void _do(T && x) {cerr<<x<<endl;}
template<typename T, typename ...S> void _do(T && x, S && ...y) {cerr<<x<<", "; _do(y...);}
#else
#define bug(...)
#define endl '\n'
#endif 

const ll inf = 0x3f3f3f3f3f3f3f3f;
const int maxn = 2e5+5;
int a[maxn], ps[maxn];

vector<ll> yoi;

signed main(){
	ios::sync_with_stdio(0), cin.tie(0);
	bug(1,2);

	int n; cin>>n;

	REP1(i,n) {
		cin>>a[i];
		ps[i] = ps[i-1] + a[i];
	}
	vector<pair<double, double> > po;
	double rbound = -1;
	REP1(len,n) {
		for(int i = 1; i+len-1 <= n; ++i) {
			double me = (ps[i+len-1] - ps[i-1])/(double)len;
			if(i == 1) MX(rbound, me);
			double nxt = (i+len-1<n)?(ps[i+len] - ps[i])/(double)len : inf;
			po.pb({me, nxt});
		}
	}

	sort(ALL(po));
	double re = inf;
	for(auto yo : po) {
		MN(re,rbound - yo.f);
		MX(rbound, yo.s);
		if(rbound >= inf -1) break;
	}
	cout<<fixed<<setprecision(12)<<re<<endl;


}

• Subtask 1: 0 / 1
• Subtask 2: 0 / 33
• Subtask 3: 0 / 33
• Subtask 4: 0 / 33