Submission #824995

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
824995	2023-08-14T13:00:16 Z	QwertyPi	Hacker (BOI15_hac)	C++14	40 / 100	32 ms	13424 KB

hac

#include <bits/stdc++.h>

using namespace std;

const int MAXN = 5e5 + 11;
const int LGN = 21;
int a[MAXN], s[MAXN * 3], b[MAXN * 2];

struct SparseTable{
	int st[LGN][MAXN];
	void init(int n, int* a, int (*g)(int, int)){
		f = g;
		for(int i = 0; i < n; i++) st[0][i] = a[i];
		for(int j = 1; j < LGN; j++){
			for(int i = 0; i <= n - (1 << j); i++){
				st[j][i] = f(st[j - 1][i], st[j - 1][i + (1 << j - 1)]);
			}
		}
	}

	int qry(int l, int r){
		int d = __lg(r - l + 1);
		return f(st[d][l], st[d][r - (1 << d) + 1]);
	}
	int (*f)(int, int);
} ST;

int32_t main(){
	int n; cin >> n;
	for(int i = 0; i < n; i++) cin >> a[i];
	for(int i = 0; i < n; i++) a[i + n * 2] = a[i + n] = a[i];
	for(int i = 0; i < n * 3; i++) s[i + 1] = s[i] + a[i];
	for(int i = 0; i < n * 2; i++) b[i] = s[i + (n + 1) / 2] - s[i];
	ST.init(n * 2, b, [](int a, int b){ return min(a, b); });
	int ans = 0;
	for(int i = 0; i < n; i++){
		ans = max(ans, ST.qry(i, i + (n + 1) / 2 - 1));
	}
	cout << ans << endl;
}

Compilation message

hac.cpp: In member function 'void SparseTable::init(int, int*, int (*)(int, int))':
hac.cpp:16:54: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   16 |     st[j][i] = f(st[j - 1][i], st[j - 1][i + (1 << j - 1)]);
      |                                                    ~~^~~

Subtask #1

20.0 / 20.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	340 KB	Output is correct
2	Correct	1 ms	340 KB	Output is correct
3	Correct	1 ms	340 KB	Output is correct
4	Correct	1 ms	340 KB	Output is correct
5	Correct	0 ms	304 KB	Output is correct
6	Correct	1 ms	340 KB	Output is correct
7	Correct	1 ms	340 KB	Output is correct
8	Correct	1 ms	340 KB	Output is correct
9	Correct	0 ms	396 KB	Output is correct
10	Correct	1 ms	340 KB	Output is correct
11	Correct	1 ms	340 KB	Output is correct
12	Correct	1 ms	340 KB	Output is correct
13	Correct	0 ms	340 KB	Output is correct
14	Correct	0 ms	340 KB	Output is correct
15	Correct	1 ms	340 KB	Output is correct
16	Correct	0 ms	340 KB	Output is correct
17	Correct	1 ms	340 KB	Output is correct
18	Correct	0 ms	340 KB	Output is correct

Subtask #2

20.0 / 20.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	340 KB	Output is correct
2	Correct	1 ms	340 KB	Output is correct
3	Correct	1 ms	340 KB	Output is correct
4	Correct	1 ms	340 KB	Output is correct
5	Correct	0 ms	304 KB	Output is correct
6	Correct	1 ms	340 KB	Output is correct
7	Correct	1 ms	340 KB	Output is correct
8	Correct	1 ms	340 KB	Output is correct
9	Correct	0 ms	396 KB	Output is correct
10	Correct	1 ms	340 KB	Output is correct
11	Correct	1 ms	340 KB	Output is correct
12	Correct	1 ms	340 KB	Output is correct
13	Correct	0 ms	340 KB	Output is correct
14	Correct	0 ms	340 KB	Output is correct
15	Correct	1 ms	340 KB	Output is correct
16	Correct	0 ms	340 KB	Output is correct
17	Correct	1 ms	340 KB	Output is correct
18	Correct	0 ms	340 KB	Output is correct
19	Correct	1 ms	340 KB	Output is correct
20	Correct	1 ms	436 KB	Output is correct
21	Correct	1 ms	468 KB	Output is correct
22	Correct	1 ms	724 KB	Output is correct
23	Correct	2 ms	980 KB	Output is correct
24	Correct	2 ms	696 KB	Output is correct
25	Correct	2 ms	980 KB	Output is correct
26	Correct	2 ms	980 KB	Output is correct
27	Correct	0 ms	340 KB	Output is correct
28	Correct	0 ms	340 KB	Output is correct
29	Correct	0 ms	340 KB	Output is correct
30	Correct	2 ms	980 KB	Output is correct
31	Correct	1 ms	1088 KB	Output is correct

Subtask #3

0 / 20.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	308 KB	Output is correct
2	Correct	1 ms	432 KB	Output is correct
3	Correct	3 ms	1084 KB	Output is correct
4	Correct	27 ms	13424 KB	Output is correct
5	Runtime error	32 ms	4300 KB	Execution killed with signal 11
6	Halted	0 ms	0 KB	-

Subtask #4

0 / 40.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	340 KB	Output is correct
2	Correct	1 ms	340 KB	Output is correct
3	Correct	1 ms	340 KB	Output is correct
4	Correct	1 ms	340 KB	Output is correct
5	Correct	0 ms	304 KB	Output is correct
6	Correct	1 ms	340 KB	Output is correct
7	Correct	1 ms	340 KB	Output is correct
8	Correct	1 ms	340 KB	Output is correct
9	Correct	0 ms	396 KB	Output is correct
10	Correct	1 ms	340 KB	Output is correct
11	Correct	1 ms	340 KB	Output is correct
12	Correct	1 ms	340 KB	Output is correct
13	Correct	0 ms	340 KB	Output is correct
14	Correct	0 ms	340 KB	Output is correct
15	Correct	1 ms	340 KB	Output is correct
16	Correct	0 ms	340 KB	Output is correct
17	Correct	1 ms	340 KB	Output is correct
18	Correct	0 ms	340 KB	Output is correct
19	Correct	1 ms	340 KB	Output is correct
20	Correct	1 ms	436 KB	Output is correct
21	Correct	1 ms	468 KB	Output is correct
22	Correct	1 ms	724 KB	Output is correct
23	Correct	2 ms	980 KB	Output is correct
24	Correct	2 ms	696 KB	Output is correct
25	Correct	2 ms	980 KB	Output is correct
26	Correct	2 ms	980 KB	Output is correct
27	Correct	0 ms	340 KB	Output is correct
28	Correct	0 ms	340 KB	Output is correct
29	Correct	0 ms	340 KB	Output is correct
30	Correct	2 ms	980 KB	Output is correct
31	Correct	1 ms	1088 KB	Output is correct
32	Correct	0 ms	308 KB	Output is correct
33	Correct	1 ms	432 KB	Output is correct
34	Correct	3 ms	1084 KB	Output is correct
35	Correct	27 ms	13424 KB	Output is correct
36	Runtime error	32 ms	4300 KB	Execution killed with signal 11
37	Halted	0 ms	0 KB	-