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Submission #104605

# Submission time Handle Problem Language Result Execution time Memory
104605 2019-04-08T10:41:47 Z teomrn Hacker (BOI15_hac) C++14
100 / 100
 142 ms 17736 KB 
#include <iostream>
#include <stdio.h>
#include <queue>
#include <algorithm>
using namespace std;

struct MinHeap {
    priority_queue <int> added, removed;

    void add(int x) {
        added.push(-x);
    }
    void rem(int x) {
        removed.push(-x);
    }

    int top() {
        while (!removed.empty() && removed.top() == added.top())
            removed.pop(), added.pop();
        return -added.top();
    }

    MinHeap() {
        added.push(-2e9);
    }
} h;

const int NMAX = 500010;
int vals[NMAX];
int sp[2 * NMAX];
int ans[2 * NMAX];

int main()
{
    int n;
    scanf("%d", &n);

    for (int i = 0; i < n; i++) {
        scanf("%d", vals + i);
        sp[i] = sp[i + n] = vals[i];
    }

    for (int i = 1; i < 2 * n; i++)
        sp[i] += sp[i - 1];

    int l = (n + 1) / 2;
    fill(ans, ans + 2 * n, 2e9);

    for (int i = 0; i + l - 1 < 2 * n; i++) {
        int val = sp[i + l - 1] - (i ? sp[i - 1] : 0);
        h.add(val);
        ans[i] = h.top();

        if (i >= l - 1) {
            int val = sp[i] - (i >= l ? sp[i - l] : 0);
            h.rem(val);
        }
    }

    int best = 0;

    for (int i = 0; i < n; i++) {
        int act = min(ans[i], ans[i + n]);
        best = max(best, act);
    }

    printf("%d\n", best);

    return 0;
}

Compilation message

hac.cpp: In function 'int main()':
hac.cpp:36:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
     ~~~~~^~~~~~~~~~
hac.cpp:39:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", vals + i);
         ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 384 KB Output is correct
2 Correct 2 ms 384 KB Output is correct
3 Correct 3 ms 384 KB Output is correct
4 Correct 2 ms 384 KB Output is correct
5 Correct 2 ms 384 KB Output is correct
6 Correct 2 ms 384 KB Output is correct
7 Correct 2 ms 384 KB Output is correct
8 Correct 3 ms 384 KB Output is correct
9 Correct 3 ms 384 KB Output is correct
10 Correct 2 ms 384 KB Output is correct
11 Correct 3 ms 384 KB Output is correct
12 Correct 2 ms 384 KB Output is correct
13 Correct 2 ms 384 KB Output is correct
14 Correct 3 ms 384 KB Output is correct
15 Correct 2 ms 384 KB Output is correct
16 Correct 2 ms 384 KB Output is correct
17 Correct 2 ms 284 KB Output is correct
18 Correct 2 ms 384 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 384 KB Output is correct
2 Correct 2 ms 384 KB Output is correct
3 Correct 3 ms 384 KB Output is correct
4 Correct 2 ms 384 KB Output is correct
5 Correct 2 ms 384 KB Output is correct
6 Correct 2 ms 384 KB Output is correct
7 Correct 2 ms 384 KB Output is correct
8 Correct 3 ms 384 KB Output is correct
9 Correct 3 ms 384 KB Output is correct
10 Correct 2 ms 384 KB Output is correct
11 Correct 3 ms 384 KB Output is correct
12 Correct 2 ms 384 KB Output is correct
13 Correct 2 ms 384 KB Output is correct
14 Correct 3 ms 384 KB Output is correct
15 Correct 2 ms 384 KB Output is correct
16 Correct 2 ms 384 KB Output is correct
17 Correct 2 ms 284 KB Output is correct
18 Correct 2 ms 384 KB Output is correct
19 Correct 2 ms 384 KB Output is correct
20 Correct 2 ms 384 KB Output is correct
21 Correct 2 ms 384 KB Output is correct
22 Correct 3 ms 512 KB Output is correct
23 Correct 4 ms 512 KB Output is correct
24 Correct 3 ms 512 KB Output is correct
25 Correct 3 ms 512 KB Output is correct
26 Correct 3 ms 512 KB Output is correct
27 Correct 2 ms 384 KB Output is correct
28 Correct 2 ms 384 KB Output is correct
29 Correct 2 ms 384 KB Output is correct
30 Correct 3 ms 512 KB Output is correct
31 Correct 3 ms 512 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 384 KB Output is correct
2 Correct 2 ms 384 KB Output is correct
3 Correct 3 ms 512 KB Output is correct
4 Correct 23 ms 2684 KB Output is correct
5 Correct 64 ms 6764 KB Output is correct
6 Correct 72 ms 8364 KB Output is correct
7 Correct 70 ms 10984 KB Output is correct
8 Correct 141 ms 17636 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 384 KB Output is correct
2 Correct 2 ms 384 KB Output is correct
3 Correct 3 ms 384 KB Output is correct
4 Correct 2 ms 384 KB Output is correct
5 Correct 2 ms 384 KB Output is correct
6 Correct 2 ms 384 KB Output is correct
7 Correct 2 ms 384 KB Output is correct
8 Correct 3 ms 384 KB Output is correct
9 Correct 3 ms 384 KB Output is correct
10 Correct 2 ms 384 KB Output is correct
11 Correct 3 ms 384 KB Output is correct
12 Correct 2 ms 384 KB Output is correct
13 Correct 2 ms 384 KB Output is correct
14 Correct 3 ms 384 KB Output is correct
15 Correct 2 ms 384 KB Output is correct
16 Correct 2 ms 384 KB Output is correct
17 Correct 2 ms 284 KB Output is correct
18 Correct 2 ms 384 KB Output is correct
19 Correct 2 ms 384 KB Output is correct
20 Correct 2 ms 384 KB Output is correct
21 Correct 2 ms 384 KB Output is correct
22 Correct 3 ms 512 KB Output is correct
23 Correct 4 ms 512 KB Output is correct
24 Correct 3 ms 512 KB Output is correct
25 Correct 3 ms 512 KB Output is correct
26 Correct 3 ms 512 KB Output is correct
27 Correct 2 ms 384 KB Output is correct
28 Correct 2 ms 384 KB Output is correct
29 Correct 2 ms 384 KB Output is correct
30 Correct 3 ms 512 KB Output is correct
31 Correct 3 ms 512 KB Output is correct
32 Correct 2 ms 384 KB Output is correct
33 Correct 2 ms 384 KB Output is correct
34 Correct 3 ms 512 KB Output is correct
35 Correct 23 ms 2684 KB Output is correct
36 Correct 64 ms 6764 KB Output is correct
37 Correct 72 ms 8364 KB Output is correct
38 Correct 70 ms 10984 KB Output is correct
39 Correct 141 ms 17636 KB Output is correct
40 Correct 5 ms 768 KB Output is correct
41 Correct 7 ms 1152 KB Output is correct
42 Correct 13 ms 1536 KB Output is correct
43 Correct 56 ms 8172 KB Output is correct
44 Correct 142 ms 17640 KB Output is correct
45 Correct 24 ms 3824 KB Output is correct
46 Correct 98 ms 10932 KB Output is correct
47 Correct 142 ms 17736 KB Output is correct
48 Correct 97 ms 13680 KB Output is correct
49 Correct 96 ms 17036 KB Output is correct
50 Correct 90 ms 17200 KB Output is correct