답안 #31580 :: oj.uz

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
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

#	결과	메모리	Grader output
1	Correct	9828 KB	Output is correct
2	Correct	9828 KB	Output is correct
3	Correct	9828 KB	Output is correct
4	Correct	9828 KB	Output is correct
5	Correct	9828 KB	Output is correct
6	Correct	9828 KB	Output is correct
7	Correct	9828 KB	Output is correct
8	Correct	9828 KB	Output is correct
9	Correct	9828 KB	Output is correct
10	Correct	9828 KB	Output is correct
11	Correct	9828 KB	Output is correct
12	Correct	9828 KB	Output is correct
13	Correct	9828 KB	Output is correct
14	Correct	9828 KB	Output is correct
15	Correct	9828 KB	Output is correct
16	Correct	9828 KB	Output is correct
17	Correct	9828 KB	Output is correct
18	Correct	9828 KB	Output is correct

Subtask #2
20.0 / 20.0

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

Subtask #3
20.0 / 20.0

#	결과	실행 시간	메모리	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

#	결과	실행 시간	메모리	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

답안 #31580

Compilation message

Subtask #1 20.0 / 20.0

Subtask #2 20.0 / 20.0

Subtask #3 20.0 / 20.0

Subtask #4 40.0 / 40.0

Subtask #1
20.0 / 20.0

Subtask #2
20.0 / 20.0

Subtask #3
20.0 / 20.0

Subtask #4
40.0 / 40.0