oj.uz

답안 #234854

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
234854 2020-05-26T04:00:23 Z eggag32 Hacker (BOI15_hac) C++17
100 / 100
 161 ms 10744 KB 
#pragma GCC optimize ("O3")
#pragma GCC target ("sse4")
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
typedef vector<int> vi;
typedef pair<int, int> pi;
#define debug(x) cerr << #x << ": " << x << endl;
#define debug2(x, y) debug(x) debug(y);
#define repn(i, a, b) for(int i = (int)(a); i < (int)(b); i++)
#define rep(i, a) for(int i = 0; i < (int)(a); i++)
#define all(v) v.begin(), v.end() 
#define mp make_pair
#define pb push_back
#define lb lower_bound
#define ub upper_bound
#define fi first
#define se second
#define sq(x) ((x) * (x))
const int MAXN = 5e5 + 5;

template<class T> T gcd(T a, T b){ return ((b == 0) ? a : gcd(b, a % b)); }

int n;
int b[MAXN], s1[4 * MAXN];

void build(int id = 1, int l = 0, int r = n){
	if(r - l < 2){
		s1[id] = b[l];
		return;
	}
	int mid = (l + r) / 2;
	build(id * 2, l, mid);
	build(id * 2 + 1, mid, r);
	s1[id] = min(s1[id * 2], s1[id * 2 + 1]);
}

int minQ(int x, int y, int id = 1, int l = 0, int r = n){
	if(x >= r || l >= y) return 1e9;
	if(x <= l && r <= y) return s1[id];
	int mid = (l + r) / 2;
	return min(minQ(x, y, id * 2, l, mid), minQ(x, y, id * 2 + 1, mid, r));
}

int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	//freopen("input.in", "r", stdin);
	//freopen("output.out", "w", stdout);
	cin >> n;
	vi a(n);
	rep(i, n) cin >> a[i];
	int ans = 0;
	int cur = 0;
	rep(i, (n + 1) / 2) cur += a[i];
	int lst = 0;
	int nxt = (n + 1) / 2;
	b[0] = cur;
	repn(i, 1, n){
		b[i] = b[i - 1];
		b[i] -= a[lst];
		lst++;
		b[i] += a[nxt];
		nxt++;
		if(nxt == n) nxt = 0;
	}
	build();
	rep(i, n){
		int st = max(0, i - ((n + 1) / 2) + 1);
		int cur = min(minQ(st, min(i + 1, st + (n + 1) / 2)), minQ(n - max((n + 1) / 2 - i, 0) + 1, n));
		ans = max(ans, cur);
	}
	cout << ans << endl;
	return 0;
}
/*
Things to look out for:
	- Integer overflows
	- Array bounds
	- Special cases
Be careful!
*/

Subtask #1
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 4 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 4 ms 384 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 5 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 5 ms 384 KB Output is correct
11 Correct 4 ms 384 KB Output is correct
12 Correct 5 ms 384 KB Output is correct
13 Correct 5 ms 384 KB Output is correct
14 Correct 4 ms 384 KB Output is correct
15 Correct 5 ms 384 KB Output is correct
16 Correct 4 ms 384 KB Output is correct
17 Correct 5 ms 256 KB Output is correct
18 Correct 5 ms 384 KB Output is correct

Subtask #2
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 4 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 4 ms 384 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 5 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 5 ms 384 KB Output is correct
11 Correct 4 ms 384 KB Output is correct
12 Correct 5 ms 384 KB Output is correct
13 Correct 5 ms 384 KB Output is correct
14 Correct 4 ms 384 KB Output is correct
15 Correct 5 ms 384 KB Output is correct
16 Correct 4 ms 384 KB Output is correct
17 Correct 5 ms 256 KB Output is correct
18 Correct 5 ms 384 KB Output is correct
19 Correct 5 ms 384 KB Output is correct
20 Correct 5 ms 384 KB Output is correct
21 Correct 5 ms 384 KB Output is correct
22 Correct 5 ms 384 KB Output is correct
23 Correct 6 ms 512 KB Output is correct
24 Correct 5 ms 384 KB Output is correct
25 Correct 6 ms 512 KB Output is correct
26 Correct 6 ms 512 KB Output is correct
27 Correct 5 ms 384 KB Output is correct
28 Correct 5 ms 384 KB Output is correct
29 Correct 5 ms 384 KB Output is correct
30 Correct 6 ms 384 KB Output is correct
31 Correct 6 ms 512 KB Output is correct

Subtask #3
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 6 ms 512 KB Output is correct
4 Correct 26 ms 2304 KB Output is correct
5 Correct 61 ms 4736 KB Output is correct
6 Correct 78 ms 5496 KB Output is correct
7 Correct 92 ms 8184 KB Output is correct
8 Correct 153 ms 10616 KB Output is correct

Subtask #4
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 4 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 4 ms 384 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 5 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 5 ms 384 KB Output is correct
11 Correct 4 ms 384 KB Output is correct
12 Correct 5 ms 384 KB Output is correct
13 Correct 5 ms 384 KB Output is correct
14 Correct 4 ms 384 KB Output is correct
15 Correct 5 ms 384 KB Output is correct
16 Correct 4 ms 384 KB Output is correct
17 Correct 5 ms 256 KB Output is correct
18 Correct 5 ms 384 KB Output is correct
19 Correct 5 ms 384 KB Output is correct
20 Correct 5 ms 384 KB Output is correct
21 Correct 5 ms 384 KB Output is correct
22 Correct 5 ms 384 KB Output is correct
23 Correct 6 ms 512 KB Output is correct
24 Correct 5 ms 384 KB Output is correct
25 Correct 6 ms 512 KB Output is correct
26 Correct 6 ms 512 KB Output is correct
27 Correct 5 ms 384 KB Output is correct
28 Correct 5 ms 384 KB Output is correct
29 Correct 5 ms 384 KB Output is correct
30 Correct 6 ms 384 KB Output is correct
31 Correct 6 ms 512 KB Output is correct
32 Correct 4 ms 384 KB Output is correct
33 Correct 5 ms 384 KB Output is correct
34 Correct 6 ms 512 KB Output is correct
35 Correct 26 ms 2304 KB Output is correct
36 Correct 61 ms 4736 KB Output is correct
37 Correct 78 ms 5496 KB Output is correct
38 Correct 92 ms 8184 KB Output is correct
39 Correct 153 ms 10616 KB Output is correct
40 Correct 7 ms 640 KB Output is correct
41 Correct 9 ms 896 KB Output is correct
42 Correct 14 ms 1036 KB Output is correct
43 Correct 63 ms 4992 KB Output is correct
44 Correct 152 ms 10488 KB Output is correct
45 Correct 34 ms 2560 KB Output is correct
46 Correct 93 ms 8056 KB Output is correct
47 Correct 159 ms 10616 KB Output is correct
48 Correct 161 ms 10744 KB Output is correct
49 Correct 149 ms 9976 KB Output is correct
50 Correct 154 ms 9976 KB Output is correct