제출 #1299316

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1299316		luvna	Hacker (BOI15_hac)	C++20	100 / 100	41 ms	18908 KiB

hac

#include<bits/stdc++.h>

#define MASK(i) (1 << (i))
#define pub push_back
#define all(v) v.begin(), v.end()
#define compact(v) v.erase(unique(all(v)), end(v))
#define pii pair<int,int>
#define fi first
#define se second
#define endl "\n"
#define sz(v) (int)(v).size()
#define dbg(x) "[" #x " = " << (x) << "]"
#define vi vector<int>

using namespace std;
bool START_ALLOC;

template<class T> bool minimize(T& a, T b){if(a > b) return a = b, true;return false;}
template<class T> bool maximize(T& a, T b){if(a < b) return a = b, true;return false;}

typedef long long ll;
typedef long double ld;

mt19937_64 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
ll rand(ll l, ll r){return uniform_int_distribution<ll>(l, r)(rng);}

const int MAX = 1e6 + 15;

int n, k;
int a[MAX];
ll pref[MAX];
ll f[MAX];

void solve(){
    cin >> n;

    for(int i = 1; i <= n; i++){
        cin >> a[i];
        pref[i] = pref[i-1] + a[i];
    }

    for(int i = n+1; i <= 2*n; i++){
        a[i] = a[i-n];
        pref[i] = pref[i-1] + a[i];
    }

    int k = (n + 1) / 2;

    for(int i = k; i <= 2*n; i++){
        f[i] = pref[i] - pref[i-k];
    }

    ll answer = 0;
    deque<int> dq;
    for(int i = 1; i <= 2*n; i++){
        while(!dq.empty() && f[dq.back()] >= f[i]) dq.pop_back();
        if(!dq.empty() && dq.front() <= i-k) dq.pop_front();
        dq.push_back(i);
        if(i >= k) maximize(answer, f[dq.front()]);
    }

    cout << answer << endl;
}

bool END_ALLOC;
signed main(){
    ios_base::sync_with_stdio(NULL);
    cin.tie(0); cout.tie(0);

    #define task "task"

    cerr << "[Static Memory : " << fixed << setprecision(2) << (((&END_ALLOC) - (&START_ALLOC)) / (1024.0 * 1024.0)) << "mb]\n";
    if(fopen(task".INP", "r")){
        freopen(task".INP", "r", stdin);
        freopen(task".OUT", "w", stdout);
    }

    int t; t = 1; //cin >> t;
    while(t--) solve();
}

컴파일 시 표준 에러 (stderr) 메시지

hac.cpp: In function 'int main()':
hac.cpp:74:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   74 |         freopen(task".INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
hac.cpp:75:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   75 |         freopen(task".OUT", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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