Submission #1090772

#	Time	Username	Problem	Language	Result	Execution time	Memory
1090772		ShaShi	Hacker (BOI15_hac)	C++17	40 / 100	1074 ms	1628 KiB

hac

#include <bits/stdc++.h>
 
// #define int long long
 
// #pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
// #pragma GCC optimize("O3")
// #pragma GCC optimize("unroll-loops")
 
#define F first 
#define S second
#define mp make_pair
#define pb push_back
#define all(x) x.begin(), x.end()
#define kill(x) cout << x << "\n", exit(0);
#define pii pair<int, int>
#define endl "\n"
 
 
 
using namespace std;
typedef long long ll;
// typedef __int128_t lll;
typedef long double ld;
 
const int MAXN = (int)1e6 + 7;
const int MOD = (int)1e9 + 7;
const int INF = (int)1e9 + 7;
 
 
int n, m, k, tmp, t, tmp2, tmp3, tmp4, u, v, w, flag, q, ans, flag2;
int arr[MAXN], ps[MAXN], dp[MAXN];


inline int go_fw(int ind, int k) {
    if (ind+k-1 <= n) return ps[ind+k-1]-ps[ind-1];
    return ps[n]-ps[ind-1]+go_fw(1, k-(n-ind+1));
}


inline int solve(int ind) {
    int j = ind, res = INF;

    for (int i=0; i<(n+1)/2; i++) {
        res = min(res, dp[j]); j--;

        if (!j) j = n;
    }
    
    return res;
}
 
int32_t main() {
    #ifdef LOCAL
    freopen("inp.in", "r", stdin);
    freopen("res.out", "w", stdout);
    #else
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    #endif

    cin >> n;

    for (int i=1; i<=n; i++) {
        cin >> arr[i]; tmp += arr[i];

        ps[i] = ps[i-1]+arr[i];
    }

    for (int i=1; i<=n; i++) dp[i] = go_fw(i, (n+1)/2);

    ans = 0;

    for (int i=1; i<=n; i++) ans = max(ans, solve(i));

    cout << ans << endl;
 
    return 0;
}

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