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Submission #823329

# Submission time Handle Problem Language Result Execution time Memory
823329 2023-08-12T10:47:53 Z serifefedartar Hacker (BOI15_hac) C++17
100 / 100
 168 ms 18816 KB 
#include <bits/stdc++.h>
using namespace std;
 
#define fast ios::sync_with_stdio(0);cin.tie(0);
typedef long long ll;
#define f first
#define s second
#define MOD 1000000009
#define LOGN 20
#define MAXN 500005
#define int long long

int n;
int sg[4*MAXN];
vector<int> v, pref;
int get_sum(int begin, int len) {
    if (begin + len - 1 <= n)
        return pref[begin + len - 1] - pref[begin - 1];
    else
        return pref[n] - pref[begin - 1] + pref[len - n + begin - 1];
}

void init(int k, int a, int b) {
    if (a == b) {
        sg[k] = get_sum(a, n/2);
        return ; 
    }
    init(2*k, a, (a+b)/2);
    init(2*k+1, (a+b)/2+1, b);
    sg[k] = max(sg[2*k], sg[2*k+1]);
}

int query(int k, int a, int b, int q_l, int q_r) {
    if (a > q_r || b < q_l)
        return 0;
    if (q_l <= a && b <= q_r)
        return sg[k];
    return max(query(2*k, a, (a+b)/2, q_l, q_r), query(2*k+1, (a+b)/2+1, b, q_l, q_r));
}

signed main() {
    fast
    cin >> n;

    v = vector<int>(n+1);
    pref = vector<int>(n+1, 0);
    for (int i = 1; i <= n; i++) {
        cin >> v[i];
        pref[i] = pref[i-1] + v[i]; 
    }
    init(1, 1, n);

    int ans = 0;
    for (int i = 1; i <= n; i++) {
        int max_protect;
        if (n % 2 && i + 1 + n/2 <= n)
            max_protect = query(1, 1, n, i + 1, i + 1 + n/2);
        else if (n % 2 == 0 && i + n/2 <= n)
            max_protect = query(1, 1, n, i + 1, i + n/2);
        else if (n % 2)
            max_protect = max(query(1, 1, n, i + 1, n), query(1, 1, n, 1, 1 + i + n/2 - n));
        else
            max_protect = max(query(1, 1, n, i + 1, n), query(1, 1, n, 1, i - n/2));
        ans = max(ans, pref[n] - max_protect);
    }
    cout << ans << "\n";
}

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 328 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 1 ms 336 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 0 ms 328 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 0 ms 212 KB Output is correct
15 Correct 0 ms 212 KB Output is correct
16 Correct 0 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 328 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 1 ms 336 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 0 ms 328 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 0 ms 212 KB Output is correct
15 Correct 0 ms 212 KB Output is correct
16 Correct 0 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 0 ms 340 KB Output is correct
20 Correct 1 ms 328 KB Output is correct
21 Correct 1 ms 340 KB Output is correct
22 Correct 1 ms 340 KB Output is correct
23 Correct 2 ms 476 KB Output is correct
24 Correct 2 ms 344 KB Output is correct
25 Correct 2 ms 468 KB Output is correct
26 Correct 2 ms 468 KB Output is correct
27 Correct 0 ms 212 KB Output is correct
28 Correct 1 ms 212 KB Output is correct
29 Correct 0 ms 212 KB Output is correct
30 Correct 2 ms 536 KB Output is correct
31 Correct 2 ms 468 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 2 ms 468 KB Output is correct
4 Correct 23 ms 3656 KB Output is correct
5 Correct 57 ms 7508 KB Output is correct
6 Correct 74 ms 8348 KB Output is correct
7 Correct 93 ms 13232 KB Output is correct
8 Correct 168 ms 16364 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 328 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 1 ms 336 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 0 ms 328 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 0 ms 212 KB Output is correct
15 Correct 0 ms 212 KB Output is correct
16 Correct 0 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 0 ms 340 KB Output is correct
20 Correct 1 ms 328 KB Output is correct
21 Correct 1 ms 340 KB Output is correct
22 Correct 1 ms 340 KB Output is correct
23 Correct 2 ms 476 KB Output is correct
24 Correct 2 ms 344 KB Output is correct
25 Correct 2 ms 468 KB Output is correct
26 Correct 2 ms 468 KB Output is correct
27 Correct 0 ms 212 KB Output is correct
28 Correct 1 ms 212 KB Output is correct
29 Correct 0 ms 212 KB Output is correct
30 Correct 2 ms 536 KB Output is correct
31 Correct 2 ms 468 KB Output is correct
32 Correct 0 ms 212 KB Output is correct
33 Correct 1 ms 340 KB Output is correct
34 Correct 2 ms 468 KB Output is correct
35 Correct 23 ms 3656 KB Output is correct
36 Correct 57 ms 7508 KB Output is correct
37 Correct 74 ms 8348 KB Output is correct
38 Correct 93 ms 13232 KB Output is correct
39 Correct 168 ms 16364 KB Output is correct
40 Correct 3 ms 792 KB Output is correct
41 Correct 6 ms 1236 KB Output is correct
42 Correct 9 ms 1476 KB Output is correct
43 Correct 60 ms 8404 KB Output is correct
44 Correct 157 ms 18544 KB Output is correct
45 Correct 28 ms 4180 KB Output is correct
46 Correct 91 ms 14544 KB Output is correct
47 Correct 159 ms 18544 KB Output is correct
48 Correct 160 ms 18816 KB Output is correct
49 Correct 152 ms 17944 KB Output is correct
50 Correct 158 ms 17944 KB Output is correct