oj.uz

Submission #31580

# Submission time Handle Problem Language Result Execution time Memory
31580 2017-08-30T01:54:52 Z ngkan146 Hacker (BOI15_hac) C++
100 / 100
 93 ms 9828 KB 
#include <bits/stdc++.h>
using namespace std;
int n;
int sum = 0;
int a[500005],b[500005];
int dq[1000005], dqfront,dqback;
int main(){
    scanf("%d",&n);
    for(int i=0;i<n;i++)
        scanf("%d",&a[i]), sum += a[i];
    for(int i=0;i<n/2;i++)
        b[0] += a[i];
    for(int i=1;i<n;i++)
        b[i] = b[i-1] - a[i-1] + a[(i+n/2-1+n)%n];
    for(int i=1;i<=n/2 + (n%2==1);i++){
        if (dqfront==dqback) dq[dqback++] = i;
        else{
            while(dqfront < dqback && b[dq[dqback-1]] < b[i]) --dqback;
            dq[dqback++]=i;
        }
    }

    int ans = 0;
    for(int i=0;i<n;i++){
        if (dq[dqfront] == i) dqfront++;
        //cout << b[dq.front()] << endl;
        ans = max(ans, sum - b[dq[dqfront]]);


        while(dqfront < dqback && b[dq[dqback-1]] < b[(i+n/2 + (n%2==1)+1)%n]) --dqback;
            dq[dqback++]=(i+n/2 + (n%2==1)+1)%n;
    }
    cout << ans;
}

Compilation message

hac.cpp: In function 'int main()':
hac.cpp:8:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
                   ^
hac.cpp:10:39: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d",&a[i]), sum += a[i];
                                       ^

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 9828 KB Output is correct
2 Correct 0 ms 9828 KB Output is correct
3 Correct 0 ms 9828 KB Output is correct
4 Correct 0 ms 9828 KB Output is correct
5 Correct 0 ms 9828 KB Output is correct
6 Correct 0 ms 9828 KB Output is correct
7 Correct 0 ms 9828 KB Output is correct
8 Correct 0 ms 9828 KB Output is correct
9 Correct 0 ms 9828 KB Output is correct
10 Correct 0 ms 9828 KB Output is correct
11 Correct 0 ms 9828 KB Output is correct
12 Correct 0 ms 9828 KB Output is correct
13 Correct 0 ms 9828 KB Output is correct
14 Correct 0 ms 9828 KB Output is correct
15 Correct 0 ms 9828 KB Output is correct
16 Correct 0 ms 9828 KB Output is correct
17 Correct 0 ms 9828 KB Output is correct
18 Correct 0 ms 9828 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 9828 KB Output is correct
2 Correct 0 ms 9828 KB Output is correct
3 Correct 0 ms 9828 KB Output is correct
4 Correct 0 ms 9828 KB Output is correct
5 Correct 0 ms 9828 KB Output is correct
6 Correct 0 ms 9828 KB Output is correct
7 Correct 0 ms 9828 KB Output is correct
8 Correct 0 ms 9828 KB Output is correct
9 Correct 0 ms 9828 KB Output is correct
10 Correct 0 ms 9828 KB Output is correct
11 Correct 0 ms 9828 KB Output is correct
12 Correct 0 ms 9828 KB Output is correct
13 Correct 0 ms 9828 KB Output is correct
14 Correct 0 ms 9828 KB Output is correct
15 Correct 0 ms 9828 KB Output is correct
16 Correct 0 ms 9828 KB Output is correct
17 Correct 0 ms 9828 KB Output is correct
18 Correct 0 ms 9828 KB Output is correct
19 Correct 0 ms 9828 KB Output is correct
20 Correct 0 ms 9828 KB Output is correct
21 Correct 0 ms 9828 KB Output is correct
22 Correct 0 ms 9828 KB Output is correct
23 Correct 0 ms 9828 KB Output is correct
24 Correct 0 ms 9828 KB Output is correct
25 Correct 0 ms 9828 KB Output is correct
26 Correct 0 ms 9828 KB Output is correct
27 Correct 0 ms 9828 KB Output is correct
28 Correct 0 ms 9828 KB Output is correct
29 Correct 0 ms 9828 KB Output is correct
30 Correct 0 ms 9828 KB Output is correct
31 Correct 0 ms 9828 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 9828 KB Output is correct
2 Correct 0 ms 9828 KB Output is correct
3 Correct 0 ms 9828 KB Output is correct
4 Correct 16 ms 9828 KB Output is correct
5 Correct 36 ms 9828 KB Output is correct
6 Correct 53 ms 9828 KB Output is correct
7 Correct 49 ms 9828 KB Output is correct
8 Correct 93 ms 9828 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 9828 KB Output is correct
2 Correct 0 ms 9828 KB Output is correct
3 Correct 0 ms 9828 KB Output is correct
4 Correct 0 ms 9828 KB Output is correct
5 Correct 0 ms 9828 KB Output is correct
6 Correct 0 ms 9828 KB Output is correct
7 Correct 0 ms 9828 KB Output is correct
8 Correct 0 ms 9828 KB Output is correct
9 Correct 0 ms 9828 KB Output is correct
10 Correct 0 ms 9828 KB Output is correct
11 Correct 0 ms 9828 KB Output is correct
12 Correct 0 ms 9828 KB Output is correct
13 Correct 0 ms 9828 KB Output is correct
14 Correct 0 ms 9828 KB Output is correct
15 Correct 0 ms 9828 KB Output is correct
16 Correct 0 ms 9828 KB Output is correct
17 Correct 0 ms 9828 KB Output is correct
18 Correct 0 ms 9828 KB Output is correct
19 Correct 0 ms 9828 KB Output is correct
20 Correct 0 ms 9828 KB Output is correct
21 Correct 0 ms 9828 KB Output is correct
22 Correct 0 ms 9828 KB Output is correct
23 Correct 0 ms 9828 KB Output is correct
24 Correct 0 ms 9828 KB Output is correct
25 Correct 0 ms 9828 KB Output is correct
26 Correct 0 ms 9828 KB Output is correct
27 Correct 0 ms 9828 KB Output is correct
28 Correct 0 ms 9828 KB Output is correct
29 Correct 0 ms 9828 KB Output is correct
30 Correct 0 ms 9828 KB Output is correct
31 Correct 0 ms 9828 KB Output is correct
32 Correct 0 ms 9828 KB Output is correct
33 Correct 0 ms 9828 KB Output is correct
34 Correct 0 ms 9828 KB Output is correct
35 Correct 16 ms 9828 KB Output is correct
36 Correct 36 ms 9828 KB Output is correct
37 Correct 53 ms 9828 KB Output is correct
38 Correct 49 ms 9828 KB Output is correct
39 Correct 93 ms 9828 KB Output is correct
40 Correct 0 ms 9828 KB Output is correct
41 Correct 3 ms 9828 KB Output is correct
42 Correct 3 ms 9828 KB Output is correct
43 Correct 29 ms 9828 KB Output is correct
44 Correct 83 ms 9828 KB Output is correct
45 Correct 13 ms 9828 KB Output is correct
46 Correct 53 ms 9828 KB Output is correct
47 Correct 86 ms 9828 KB Output is correct
48 Correct 73 ms 9828 KB Output is correct
49 Correct 69 ms 9828 KB Output is correct
50 Correct 63 ms 9828 KB Output is correct