Submission #581022

#	Time	Username	Problem	Language	Result	Execution time	Memory
581022		ktkerem	Hacker (BOI15_hac)	C++17	100 / 100	343 ms	22240 KiB

hac

/*#pragma GCC target ("avx2")
#pragma GCC optimize ("O3")
#pragma GCC optimize("Ofast")
#pragma GCC optimize ("unroll-loops")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")*/
#include<bits/stdc++.h>
/*#include <bits/extc++.h>
using namespace std;
using namespace __gnu_pbds;
template<class T>
using oset = tree<T, null_type, less_equal<T>, rb_tree_tag, tree_order_statistics_node_update>;
/**/
//typedef int ll;
typedef long long ll;
typedef unsigned long long ull;
typedef __int128 vll;
typedef unsigned __int128 uvll;
ll _i=0;
#define ffn(x) _i=x
#define llll std::pair<ll , ll>
#define stitr set<ll>::iterator
#define fora(y,x) for(ll y=_i;x>y;y++)
#define pb push_back
#define pf push_front
#define halo cout << "hello\n"
#define fi first
#define sec second
#define all(a) a.begin() , a.end()
const ll limit = 1e18 + 7; 
const ll ous = 3e5;
const ll dx[4] = {1 , 0 , 0 , -1} , dy[4] = {0,1,-1,0};
void solve(){
    ll n;std::cin >> n;
    ll ar[n];
    fora(i, n){
        std::cin >> ar[i];
    }
    ll p = 0;
    std::vector<ll> ns;
    std::multiset<ll> st;
    for(ll i = 0;n/2 + (n & 1) > i;i++){
        p+=ar[i];
    }
    ns.pb(p);
    for(ll i = n/2 + (n & 1);n + n/2 + (n & 1) - 1 > i;i++){
        p-= ar[(i-(n/2 + (n & 1))) % n];
        p+= ar[i % n];
        ns.pb(p); 
    }
    for(ll i = 0;n/2 + (n & 1) > i;i++){
        st.insert(ns[i]);
    }
    ll ans = *st.begin();
    for(ll i = n/2 + (n & 1);n + n/2 + (n & 1) - 1 > i;i++){
        st.erase(st.find(ns[(i-(n/2 + (n & 1))) % n]));
        st.insert(ns[i % n]);
        ans = std::max(ans , *st.begin());
    }
    std::cout << ans << "\n";
    return;/**/
}
signed main(){
    std::ios_base::sync_with_stdio(false);std::cin.tie(NULL);
    ll t=1;
    //std::cin >> t;
    ll o = 1;
    while(t--){ 
        //cout << "Case " << o++ << ":\n";
        solve();
    }
    return 0; 
}

Compilation message (stderr)

hac.cpp:12:1: warning: "/*" within comment [-Wcomment]
   12 | /**/
      |  
hac.cpp: In function 'int main()':
hac.cpp:66:8: warning: unused variable 'o' [-Wunused-variable]
   66 |     ll o = 1;
      |        ^

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