Submission #634052

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
634052	2022-08-23T18:07:05 Z	izanbf	Hacker (BOI15_hac)	C++14	100 / 100	293 ms	16088 KB

hac

#include <bits/stdc++.h>
using namespace std;

#define D(x) cerr << #x << " = " << x << ", "

using vi = vector<int>;
using vvi = vector<vi>;

vi compute_ksums(const vi& a, int k) {
	int n = a.size();
	vi v(2*n);
	for (int i = 0; i < n; ++i) {
		v[i] = v[n+i] = a[i];
	}
	vi pre(2*n+1); // pre[i+1] = v[0]+...+v[i]
	for (int i = 0; i < 2*n; ++i) {
		pre[i+1] = pre[i] + v[i];
	}
	vi ksums(n); // ksums[i] = v[i] + ... + v[i+k-1]
	for (int i = 0; i < n; ++i) {
		ksums[i] = pre[i+k] - pre[i];
	}
	return ksums;
}

int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);

	int n;
	cin >> n;

	int k = n/2; // range of the deffender

	int sum = 0;
	vi v(n);
	for (int i = 0; i < n; ++i) {
		cin >> v[i];
		sum += v[i];
	}

	vi ksums = compute_ksums(v, k);
	multiset<int> s;
	int l = 1;
	int r = n-k;
	int ans = 0;
	for (int i = l; i <= r; ++i) {
		s.insert(-ksums[i]);
	} 
	for (int i = 0; i < n; ++i) {
		int best = -(*s.begin());
		ans = max(ans, sum-best);
		r = (r+1)%n;
		s.insert(-ksums[r]);
		s.erase(s.find(-ksums[l]));
		l = (l+1)%n;
	}
	
	cout << ans << endl;
}

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	1 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	212 KB	Output is correct
7	Correct	0 ms	212 KB	Output is correct
8	Correct	0 ms	212 KB	Output is correct
9	Correct	0 ms	212 KB	Output is correct
10	Correct	0 ms	212 KB	Output is correct
11	Correct	0 ms	212 KB	Output is correct
12	Correct	1 ms	212 KB	Output is correct
13	Correct	0 ms	212 KB	Output is correct
14	Correct	1 ms	212 KB	Output is correct
15	Correct	0 ms	212 KB	Output is correct
16	Correct	0 ms	212 KB	Output is correct
17	Correct	0 ms	212 KB	Output is correct
18	Correct	0 ms	212 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	1 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	212 KB	Output is correct
7	Correct	0 ms	212 KB	Output is correct
8	Correct	0 ms	212 KB	Output is correct
9	Correct	0 ms	212 KB	Output is correct
10	Correct	0 ms	212 KB	Output is correct
11	Correct	0 ms	212 KB	Output is correct
12	Correct	1 ms	212 KB	Output is correct
13	Correct	0 ms	212 KB	Output is correct
14	Correct	1 ms	212 KB	Output is correct
15	Correct	0 ms	212 KB	Output is correct
16	Correct	0 ms	212 KB	Output is correct
17	Correct	0 ms	212 KB	Output is correct
18	Correct	0 ms	212 KB	Output is correct
19	Correct	1 ms	212 KB	Output is correct
20	Correct	1 ms	340 KB	Output is correct
21	Correct	1 ms	340 KB	Output is correct
22	Correct	2 ms	340 KB	Output is correct
23	Correct	2 ms	468 KB	Output is correct
24	Correct	1 ms	340 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	0 ms	212 KB	Output is correct
29	Correct	0 ms	212 KB	Output is correct
30	Correct	2 ms	468 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	0 ms	212 KB	Output is correct
3	Correct	2 ms	468 KB	Output is correct
4	Correct	28 ms	2796 KB	Output is correct
5	Correct	108 ms	6584 KB	Output is correct
6	Correct	157 ms	8152 KB	Output is correct
7	Correct	141 ms	9596 KB	Output is correct
8	Correct	293 ms	15944 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	1 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	212 KB	Output is correct
7	Correct	0 ms	212 KB	Output is correct
8	Correct	0 ms	212 KB	Output is correct
9	Correct	0 ms	212 KB	Output is correct
10	Correct	0 ms	212 KB	Output is correct
11	Correct	0 ms	212 KB	Output is correct
12	Correct	1 ms	212 KB	Output is correct
13	Correct	0 ms	212 KB	Output is correct
14	Correct	1 ms	212 KB	Output is correct
15	Correct	0 ms	212 KB	Output is correct
16	Correct	0 ms	212 KB	Output is correct
17	Correct	0 ms	212 KB	Output is correct
18	Correct	0 ms	212 KB	Output is correct
19	Correct	1 ms	212 KB	Output is correct
20	Correct	1 ms	340 KB	Output is correct
21	Correct	1 ms	340 KB	Output is correct
22	Correct	2 ms	340 KB	Output is correct
23	Correct	2 ms	468 KB	Output is correct
24	Correct	1 ms	340 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	0 ms	212 KB	Output is correct
29	Correct	0 ms	212 KB	Output is correct
30	Correct	2 ms	468 KB	Output is correct
31	Correct	2 ms	468 KB	Output is correct
32	Correct	0 ms	212 KB	Output is correct
33	Correct	0 ms	212 KB	Output is correct
34	Correct	2 ms	468 KB	Output is correct
35	Correct	28 ms	2796 KB	Output is correct
36	Correct	108 ms	6584 KB	Output is correct
37	Correct	157 ms	8152 KB	Output is correct
38	Correct	141 ms	9596 KB	Output is correct
39	Correct	293 ms	15944 KB	Output is correct
40	Correct	4 ms	596 KB	Output is correct
41	Correct	8 ms	916 KB	Output is correct
42	Correct	11 ms	1272 KB	Output is correct
43	Correct	92 ms	6580 KB	Output is correct
44	Correct	286 ms	15976 KB	Output is correct
45	Correct	43 ms	3380 KB	Output is correct
46	Correct	151 ms	9592 KB	Output is correct
47	Correct	283 ms	16088 KB	Output is correct
48	Correct	227 ms	15976 KB	Output is correct
49	Correct	207 ms	15976 KB	Output is correct
50	Correct	198 ms	15980 KB	Output is correct