oj.uz

답안 #639569

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
639569 2022-09-10T16:13:31 Z valerikk Monochrome Points (JOI20_monochrome) C++17
35 / 100
 2000 ms 39548 KB 
#include <bits/stdc++.h>

using namespace std;

struct Fenwick {
	int sz;
	vector<int> f;

	void add(int i, int val) {
		for (++i; i <= sz; i += i & -i) {
			f[i] += val;
		}
	}

	int calc(int i) {
		int res = 0;
		for (; i > 0; i -= i & -i) {
			res += f[i];
		}
		return res;
	}

	Fenwick(int sz_) : sz(sz_) {
		f.resize(sz + 1, 0);
	}
};

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	int n;
	string s;
	cin >> n >> s;
	vector<int> black, white;
	for (int i = 0; i < 2 * n; ++i) {
		if (s[i] == 'W') {
			white.push_back(i);
		} else {
			black.push_back(i);
		}
	}
	sort(black.begin(), black.end());
	sort(white.begin(), white.end());
	auto calc = [&](int k) {
		k %= n;
		vector<vector<int>> start(2 * n + 1), finish(2 * n + 1);
		Fenwick fenw(2 * n);
		vector<pair<int, int>> segments;
		for (int i = 0; i < n; ++i) {
			int x = black[i], y = white[(i + k) % n];
			segments.push_back({min(x, y), max(x, y)});
		}
		for (int i = 0; i < n; ++i) {
			start[segments[i].first + 1].push_back(i);
			finish[segments[i].second].push_back(i);
		}
		long long res = 0;
		int tot = 0;
		for (int i = 0; i < 2 * n; ++i) {
			for (int j : start[i]) {
				++tot;
				fenw.add(segments[j].first, 1);
			}
			for (int j : finish[i]) {
				--tot;
				fenw.add(segments[j].first, -1);
			}
			for (int j : finish[i]) {
				res += tot - fenw.calc(segments[j].first + 1);
			}
		}
		return res;
	};
	if (n == 1) {
		cout << calc(0) << endl;
		return 0;
	}
	vector<int> f(n + 1);
	for (int i = 0; i < n + 1; ++i) {
		f[i] = i % n;
	}
	vector<long long> mem(n + 1, -1);
	auto get = [&](int x) {
		return mem[x] == -1 ? mem[x] = calc(f[x]) : mem[x];
	};
	if (get(0) < get(1)) {
		reverse(f.begin() + 1, f.end());
	}
	int l = 0, r = n;
	while (r - l > 1) {
		int m = (l + r) / 2;
		if (get(m) < get(0)) {
			l = m;
		} else {
			r = m;
		}
	}
	r = n;
	while (r - l > 2) {
		int m = (l + r) / 2;
		if (get(m) < get(m + 1)) {
			l = m;
		} else {
			r = m + 1;
		}
	}
	long long ans = 0;
	for (int k = l; k <= r; ++k) {
		ans = max(ans, get(k));
	}
	cout << ans << endl;
	return 0;
}

Subtask #1
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 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 0 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct

Subtask #2
21.0 / 21.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 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 0 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 2 ms 340 KB Output is correct
15 Correct 2 ms 340 KB Output is correct
16 Correct 2 ms 340 KB Output is correct
17 Correct 2 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 2 ms 340 KB Output is correct
20 Correct 3 ms 340 KB Output is correct
21 Correct 2 ms 340 KB Output is correct
22 Correct 2 ms 340 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 1 ms 340 KB Output is correct
25 Correct 1 ms 340 KB Output is correct
26 Correct 1 ms 340 KB Output is correct
27 Correct 1 ms 340 KB Output is correct
28 Correct 2 ms 340 KB Output is correct
29 Correct 1 ms 340 KB Output is correct
30 Correct 1 ms 340 KB Output is correct
31 Correct 1 ms 340 KB Output is correct
32 Correct 1 ms 340 KB Output is correct
33 Correct 2 ms 340 KB Output is correct

Subtask #3
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 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 0 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 2 ms 340 KB Output is correct
15 Correct 2 ms 340 KB Output is correct
16 Correct 2 ms 340 KB Output is correct
17 Correct 2 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 2 ms 340 KB Output is correct
20 Correct 3 ms 340 KB Output is correct
21 Correct 2 ms 340 KB Output is correct
22 Correct 2 ms 340 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 1 ms 340 KB Output is correct
25 Correct 1 ms 340 KB Output is correct
26 Correct 1 ms 340 KB Output is correct
27 Correct 1 ms 340 KB Output is correct
28 Correct 2 ms 340 KB Output is correct
29 Correct 1 ms 340 KB Output is correct
30 Correct 1 ms 340 KB Output is correct
31 Correct 1 ms 340 KB Output is correct
32 Correct 1 ms 340 KB Output is correct
33 Correct 2 ms 340 KB Output is correct
34 Correct 12 ms 696 KB Output is correct
35 Correct 14 ms 700 KB Output is correct
36 Correct 22 ms 700 KB Output is correct
37 Correct 16 ms 660 KB Output is correct
38 Correct 13 ms 668 KB Output is correct
39 Correct 11 ms 704 KB Output is correct
40 Correct 9 ms 676 KB Output is correct
41 Correct 9 ms 700 KB Output is correct
42 Correct 15 ms 712 KB Output is correct
43 Correct 9 ms 708 KB Output is correct
44 Correct 10 ms 684 KB Output is correct
45 Correct 13 ms 596 KB Output is correct
46 Correct 8 ms 596 KB Output is correct
47 Correct 17 ms 596 KB Output is correct
48 Correct 11 ms 708 KB Output is correct
49 Correct 11 ms 672 KB Output is correct
50 Correct 5 ms 596 KB Output is correct
51 Correct 6 ms 596 KB Output is correct
52 Correct 13 ms 704 KB Output is correct

Subtask #4
0.0 / 65.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 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 0 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 2 ms 340 KB Output is correct
15 Correct 2 ms 340 KB Output is correct
16 Correct 2 ms 340 KB Output is correct
17 Correct 2 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 2 ms 340 KB Output is correct
20 Correct 3 ms 340 KB Output is correct
21 Correct 2 ms 340 KB Output is correct
22 Correct 2 ms 340 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 1 ms 340 KB Output is correct
25 Correct 1 ms 340 KB Output is correct
26 Correct 1 ms 340 KB Output is correct
27 Correct 1 ms 340 KB Output is correct
28 Correct 2 ms 340 KB Output is correct
29 Correct 1 ms 340 KB Output is correct
30 Correct 1 ms 340 KB Output is correct
31 Correct 1 ms 340 KB Output is correct
32 Correct 1 ms 340 KB Output is correct
33 Correct 2 ms 340 KB Output is correct
34 Correct 12 ms 696 KB Output is correct
35 Correct 14 ms 700 KB Output is correct
36 Correct 22 ms 700 KB Output is correct
37 Correct 16 ms 660 KB Output is correct
38 Correct 13 ms 668 KB Output is correct
39 Correct 11 ms 704 KB Output is correct
40 Correct 9 ms 676 KB Output is correct
41 Correct 9 ms 700 KB Output is correct
42 Correct 15 ms 712 KB Output is correct
43 Correct 9 ms 708 KB Output is correct
44 Correct 10 ms 684 KB Output is correct
45 Correct 13 ms 596 KB Output is correct
46 Correct 8 ms 596 KB Output is correct
47 Correct 17 ms 596 KB Output is correct
48 Correct 11 ms 708 KB Output is correct
49 Correct 11 ms 672 KB Output is correct
50 Correct 5 ms 596 KB Output is correct
51 Correct 6 ms 596 KB Output is correct
52 Correct 13 ms 704 KB Output is correct
53 Execution timed out 2059 ms 39548 KB Time limit exceeded
54 Halted 0 ms 0 KB -