oj.uz

Submission #335567

# Submission time Handle Problem Language Result Execution time Memory
335567 2020-12-13T06:14:53 Z smax Hacker (BOI15_hac) C++17
100 / 100
 63 ms 6380 KB 
#include <bits/stdc++.h>
using namespace std;

#ifdef LOCAL
#define DEBUG(...) debug(#__VA_ARGS__, __VA_ARGS__);
#else
#define DEBUG(...) 6;
#endif

template<typename T, typename S> ostream& operator << (ostream &os, const pair<T, S> &p) {return os << "(" << p.first << ", " << p.second << ")";}
template<typename C, typename T = decay<decltype(*begin(declval<C>()))>, typename enable_if<!is_same<C, string>::value>::type* = nullptr>
ostream& operator << (ostream &os, const C &c) {bool f = true; os << "["; for (const auto &x : c) {if (!f) os << ", "; f = false; os << x;} return os << "]";}
template<typename T> void debug(string s, T x) {cerr << s << " = " << x << "\n";}
template<typename T, typename... Args> void debug(string s, T x, Args... args) {cerr << s.substr(0, s.find(',')) << " = " << x << " | "; debug(s.substr(s.find(',') + 2), args...);}

template<typename T>
struct MinDeque {
    int l = 0, r = 0;
    deque<pair<T, int>> dq;

    void push(T x) {
        while (!dq.empty() && x <= dq.back().first)
            dq.pop_back();
        dq.emplace_back(x, r++);
    }

    void pop() {
        assert(l < r);
        if (dq.front().second == l++)
            dq.pop_front();
    }

    T min() {
        assert(!dq.empty());
        return dq.front().first;
    }
};

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int n;
    cin >> n;
    vector<int> a(n);
    for (int i=0; i<n; i++)
        cin >> a[i];

    vector<int> pref(n);
    for (int i=0; i<n; i++)
        pref[i] = a[i] + (i > 0 ? pref[i-1] : 0);

    auto query = [&] (int l, int r) {
        if (l <= r)
            return pref[r] - (l > 0 ? pref[l-1] : 0);
        else
            return pref[n-1] - (l > 0 ? pref[l-1] : 0) + pref[r];
    };

    MinDeque<int> dq;
    for (int i=0; i<=(n-1)/2; i++)
        dq.push(query(i, (i + (n - 1) / 2) % n));

    int ret = dq.min();
    for (int i=1; i<n; i++) {
        dq.push(query((i + (n - 1) / 2) % n, ((i + (n - 1) / 2) % n + (n - 1) / 2) % n));
        dq.pop();
        ret = max(ret, dq.min());
    }
    cout << ret << "\n";

    return 0;
}

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 0 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 0 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 1 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 1 ms 364 KB Output is correct
13 Correct 1 ms 364 KB Output is correct
14 Correct 1 ms 364 KB Output is correct
15 Correct 1 ms 364 KB Output is correct
16 Correct 1 ms 364 KB Output is correct
17 Correct 1 ms 364 KB Output is correct
18 Correct 1 ms 364 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 0 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 0 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 1 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 1 ms 364 KB Output is correct
13 Correct 1 ms 364 KB Output is correct
14 Correct 1 ms 364 KB Output is correct
15 Correct 1 ms 364 KB Output is correct
16 Correct 1 ms 364 KB Output is correct
17 Correct 1 ms 364 KB Output is correct
18 Correct 1 ms 364 KB Output is correct
19 Correct 1 ms 364 KB Output is correct
20 Correct 1 ms 364 KB Output is correct
21 Correct 1 ms 364 KB Output is correct
22 Correct 1 ms 364 KB Output is correct
23 Correct 1 ms 364 KB Output is correct
24 Correct 1 ms 364 KB Output is correct
25 Correct 1 ms 364 KB Output is correct
26 Correct 1 ms 364 KB Output is correct
27 Correct 1 ms 364 KB Output is correct
28 Correct 1 ms 364 KB Output is correct
29 Correct 1 ms 364 KB Output is correct
30 Correct 1 ms 364 KB Output is correct
31 Correct 1 ms 364 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 11 ms 1004 KB Output is correct
5 Correct 23 ms 1900 KB Output is correct
6 Correct 31 ms 2284 KB Output is correct
7 Correct 37 ms 2668 KB Output is correct
8 Correct 63 ms 4204 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 0 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 0 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 1 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 1 ms 364 KB Output is correct
13 Correct 1 ms 364 KB Output is correct
14 Correct 1 ms 364 KB Output is correct
15 Correct 1 ms 364 KB Output is correct
16 Correct 1 ms 364 KB Output is correct
17 Correct 1 ms 364 KB Output is correct
18 Correct 1 ms 364 KB Output is correct
19 Correct 1 ms 364 KB Output is correct
20 Correct 1 ms 364 KB Output is correct
21 Correct 1 ms 364 KB Output is correct
22 Correct 1 ms 364 KB Output is correct
23 Correct 1 ms 364 KB Output is correct
24 Correct 1 ms 364 KB Output is correct
25 Correct 1 ms 364 KB Output is correct
26 Correct 1 ms 364 KB Output is correct
27 Correct 1 ms 364 KB Output is correct
28 Correct 1 ms 364 KB Output is correct
29 Correct 1 ms 364 KB Output is correct
30 Correct 1 ms 364 KB Output is correct
31 Correct 1 ms 364 KB Output is correct
32 Correct 0 ms 364 KB Output is correct
33 Correct 1 ms 364 KB Output is correct
34 Correct 1 ms 364 KB Output is correct
35 Correct 11 ms 1004 KB Output is correct
36 Correct 23 ms 1900 KB Output is correct
37 Correct 31 ms 2284 KB Output is correct
38 Correct 37 ms 2668 KB Output is correct
39 Correct 63 ms 4204 KB Output is correct
40 Correct 2 ms 364 KB Output is correct
41 Correct 3 ms 492 KB Output is correct
42 Correct 4 ms 620 KB Output is correct
43 Correct 26 ms 2044 KB Output is correct
44 Correct 62 ms 4332 KB Output is correct
45 Correct 12 ms 1132 KB Output is correct
46 Correct 39 ms 2668 KB Output is correct
47 Correct 63 ms 4316 KB Output is correct
48 Correct 61 ms 4272 KB Output is correct
49 Correct 50 ms 6380 KB Output is correct
50 Correct 49 ms 6380 KB Output is correct