oj.uz

Submission #601894

# Submission time Handle Problem Language Result Execution time Memory
601894 2022-07-22T11:59:36 Z model_code Seesaw (JOI22_seesaw) C++17
100 / 100
 105 ms 11672 KB 
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll,ll> pll;
typedef vector<ll> vll;
typedef vector<pll> vpll;
#define mp make_pair
#define pb push_back
#define rep(i,n) for(int i=0;i<n;i++)
#define per(i,n) for(int i=n-1;i>=0;i--)
#define rrep(i,l,r) for(int i=l;i<=r;i++)
#define chmin(a,b) a=min(a,b)
#define chmax(a,b) a=max(a,b)
#define all(x) x.begin(),x.end()
#define unq(x) sort(all(x));x.erase(unique(all(x)),x.end())
//#define mod 1000000007
#define mod 998244353
//ll mod;
#define ad(a,b) a=(a+b)%mod;
#define mul(a,b) a=a*b%mod;
void readv(vector<ll> &a,ll n){
	rep(i,n){
		ll x;
		cin>>x;
		a.push_back(x);
	}
}
void outv(vector<ll> &a,ll n){
	rep(i,n){
		if(i>0)cout<<" ";
		cout<<a[i];
	}
	cout<<"\n";
}
ll po(ll x,ll y){
	ll res=1;
	for(;y;y>>=1){
		if(y&1)res=res*x%mod;
		x=x*x%mod;
	}
	return res;
}
ll gcd(ll a,ll b){
	return (b?gcd(b,a%b):a);
}
#define FACMAX 200010
ll fac[FACMAX],inv[FACMAX],ivf[FACMAX];
void initfac(){
	fac[0]=ivf[0]=inv[1]=1;
	for(ll i=1;i<FACMAX;i++)fac[i]=fac[i-1]*i%mod;
	for(ll i=1;i<FACMAX;i++){
		if(i>1)inv[i]=(mod-mod/i*inv[mod%i]%mod)%mod;
		ivf[i]=po(fac[i],mod-2);
	}
}
ll P(ll n,ll k){
	if(n<0||n<k)return 0;
	return fac[n]*ivf[n-k]%mod;
}
ll C(ll n,ll k){
	if(k<0||n<k)return 0;
	return fac[n]*ivf[n-k]%mod*ivf[k]%mod;
}
ll H(ll n,ll k){
	return C(n+k-1,k);
}

struct st{
    double ave;
    ll l,r;
    bool operator<(const st&key)const{
        return this->ave<key.ave;
    }
	bool operator>(const st&key)const{
        return this->ave>key.ave;
    }
};

ll n,a[200010],rui[200010];
double ave(ll l,ll r){
	return (rui[r+1]-rui[l])/(double)(r-l+1);
}

int main(){
	cin.tie(0);
	ios::sync_with_stdio(0);
	cin>>n;
    rep(i,n)cin>>a[i];
	rui[0]=0;
	rep(i,n)rui[i+1]=rui[i]+a[i];
	priority_queue<st,vector<st>,greater<st> >pq;
	double c=ave(0,n-1);
	ll l=0,r=n-1;
	while(1){
		pq.push((st){ave(l,r),l,r});
		if(l==r)break;
		if(ave(l+1,r)<=c)l++;
		else r--;
	}

    double ans=2e9;
    double ma=c;
    while(1){
		ll ls=pq.top().l,rs=pq.top().r;
		double aves=pq.top().ave;
		double range=ma-aves;
        chmin(ans,range);
        if(rs==n-1)break;
		pq.pop();
		pq.push((st){ave(ls+1,rs+1),ls+1,rs+1});
        chmax(ma,ave(ls+1,rs+1));
    }
    cout<<fixed<<setprecision(9)<<ans<<"\n";
}

Subtask #1
1.0 / 1.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 328 KB Output is correct
3 Correct 0 ms 324 KB Output is correct

Subtask #2
33.0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 328 KB Output is correct
3 Correct 0 ms 324 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct

Subtask #3
33.0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 328 KB Output is correct
3 Correct 0 ms 324 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 468 KB Output is correct
9 Correct 1 ms 468 KB Output is correct
10 Correct 1 ms 468 KB Output is correct
11 Correct 1 ms 468 KB Output is correct

Subtask #4
33.0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 328 KB Output is correct
3 Correct 0 ms 324 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 468 KB Output is correct
9 Correct 1 ms 468 KB Output is correct
10 Correct 1 ms 468 KB Output is correct
11 Correct 1 ms 468 KB Output is correct
12 Correct 101 ms 11656 KB Output is correct
13 Correct 105 ms 11604 KB Output is correct
14 Correct 80 ms 11644 KB Output is correct
15 Correct 82 ms 11576 KB Output is correct
16 Correct 87 ms 11672 KB Output is correct