Submission #537302

#	Time	Username	Problem	Language	Result	Execution time	Memory
537302		crystaalroo	Hacker (BOI15_hac)	C++14	0 / 100	0 ms	212 KiB

hac

#include <bits/stdc++.h>
#define f first
#define s second
#define fore(i,a,b) for(int i = (a), ThxMK = (b); i < ThxMK; ++i)
#define pb push_back
#define all(s) begin(s), end(s)
#define _ ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define sz(s) int(s.size())
#define ENDL '\n'
#define vv(type, name, h, ...) vector<vector<type>> name(h, vector<type>(__VA_ARGS__))
#define vvv(type, name, h, w, ...) vector<vector<vector<type>>> name(h, vector<vector<type>>(w, vector<type>(__VA_ARGS__)))
using namespace std;
 
long long gcd(long long a, long long b){ return b? gcd(b, a%b) : a; }
long long lcm(long long a, long long b){ return (!a or !b)? 0 : a * b / gcd(a,b); } 
long long  poww(long long  a, long long b){
	long long res = 1;
	while(b){ 
		if(b%2) res = res * a ; 
		a = a * a;  b>>=1;
	} return res;
}
 
// mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
// int rnd(int n){return uniform_int_distribution<int>(0, n-1)(rng);}
 
template <typename T> static constexpr T inf = numeric_limits<T>::max() / 2;
template<class t,class u>bool mmax(t&a,u b){if(a<b)a=b;return a<b;}
template<class t,class u>bool mmin(t&a,u b){if(b<a)a=b;return b<a;}
template<class t> using vc=vector<t>;
template<class t> using vvc=vc<vc<t>>;
using li = long long;
using vi = vc<int>;
using ii = pair<int,int>;
//  ('-')7


int main(){_
 
	auto solve=[&](){
		int n; cin>>n;
		vi v(n); fore(i,0,n)cin>>v[i];
		vi l(2*n,0),r(2*n,0);
		fore(i,0,2*n){
			if(i)l[i]+=l[i-1];
			l[i]+=v[i%n];
		}
		int best = 0;
		fore(i,0,n){
			int u = (n-1)/2;
			//cout<<v[i]+min(l[n+i-1]-l[n+i-1-u],l[i+u]-l[i])<<ENDL;
			best = max(best,v[i]+min(l[n+i-1]-l[n+i-1-u],l[i+u]-l[i]));
		}
		cout<<best<<ENDL;
	};
	//int t; cin>>t; while(t--)
	solve();
}

• Subtask 1: 0 / 20
• Subtask 2: 0 / 20
• Subtask 3: 0 / 20
• Subtask 4: 0 / 40