oj.uz

Submission #411575

# Submission time Handle Problem Language Result Execution time Memory
411575 2021-05-25T14:27:22 Z nichke Monochrome Points (JOI20_monochrome) C++14
100 / 100
 1229 ms 14884 KB 
#include <bits/stdc++.h>
using namespace std;
#define int long long
#define endl '\n'

int ans;
int n;
string s;

vector<int> a, b;
int bit[400005];

void clr() {
	for (int i = 1; i <= 2 * n; i++) {
		bit[i] = 0;
	}
}

void upd(int v, int k) {
	while (v <= 2 * n) {
		bit[v] += k;
		v += (v & (-v));
	}
}

int qry(int v) {
	int res = 0;
	while (v) {
		res += bit[v];
		v -= (v & (-v));
	}
	return res;
}

int sum(int l, int r) {
	return qry(r) - qry(l - 1);
}

int calc(int k) {
	int res = 0;
	vector<pair<int, int>> v;
	for (int i = 0; i < n; i++) {
		v.push_back({a[i], b[(i + k) % n]});
	}
	for (int i = 0; i < v.size(); i++) {
		if (v[i].first > v[i].second) {
			swap(v[i].first, v[i].second);
		}
	}
	sort(v.begin(), v.end());
	clr();
	for (int i = 0; i < v.size(); i++) {
		res += sum(v[i].first, v[i].second);
		upd(v[i].second, 1);
	}
	return res;
}

signed main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cin >> n >> s;
	for (int i = 0; i < 2 * n; i++) {
		if (s[i] == 'W') {
			a.push_back(i + 1);
		} else {
			b.push_back(i + 1);
		}
	}
	ans = max(calc(0), calc(n - 1));
	int l = 0, r = n - 2;
	while (l <= r) {
		int m = (l + r) / 2;
		int a = calc(m);
		int b = calc(m + 1);
		ans = max(ans, max(a, b));
		if (a < b) {
			l = m + 1;
		} else {
			r = m - 1;
		}
	}
	cout << ans << '\n';
	return 0;
}

Compilation message

monochrome.cpp: In function 'long long int calc(long long int)':
monochrome.cpp:45:20: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |  for (int i = 0; i < v.size(); i++) {
      |                  ~~^~~~~~~~~~
monochrome.cpp:52:20: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |  for (int i = 0; i < v.size(); i++) {
      |                  ~~^~~~~~~~~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct

Subtask #2
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 332 KB Output is correct
15 Correct 1 ms 332 KB Output is correct
16 Correct 1 ms 332 KB Output is correct
17 Correct 1 ms 332 KB Output is correct
18 Correct 1 ms 332 KB Output is correct
19 Correct 1 ms 332 KB Output is correct
20 Correct 1 ms 332 KB Output is correct
21 Correct 1 ms 332 KB Output is correct
22 Correct 1 ms 332 KB Output is correct
23 Correct 1 ms 332 KB Output is correct
24 Correct 2 ms 332 KB Output is correct
25 Correct 1 ms 332 KB Output is correct
26 Correct 1 ms 332 KB Output is correct
27 Correct 1 ms 332 KB Output is correct
28 Correct 1 ms 332 KB Output is correct
29 Correct 1 ms 332 KB Output is correct
30 Correct 1 ms 332 KB Output is correct
31 Correct 1 ms 332 KB Output is correct
32 Correct 1 ms 332 KB Output is correct
33 Correct 1 ms 332 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 332 KB Output is correct
15 Correct 1 ms 332 KB Output is correct
16 Correct 1 ms 332 KB Output is correct
17 Correct 1 ms 332 KB Output is correct
18 Correct 1 ms 332 KB Output is correct
19 Correct 1 ms 332 KB Output is correct
20 Correct 1 ms 332 KB Output is correct
21 Correct 1 ms 332 KB Output is correct
22 Correct 1 ms 332 KB Output is correct
23 Correct 1 ms 332 KB Output is correct
24 Correct 2 ms 332 KB Output is correct
25 Correct 1 ms 332 KB Output is correct
26 Correct 1 ms 332 KB Output is correct
27 Correct 1 ms 332 KB Output is correct
28 Correct 1 ms 332 KB Output is correct
29 Correct 1 ms 332 KB Output is correct
30 Correct 1 ms 332 KB Output is correct
31 Correct 1 ms 332 KB Output is correct
32 Correct 1 ms 332 KB Output is correct
33 Correct 1 ms 332 KB Output is correct
34 Correct 5 ms 332 KB Output is correct
35 Correct 6 ms 460 KB Output is correct
36 Correct 5 ms 332 KB Output is correct
37 Correct 5 ms 456 KB Output is correct
38 Correct 4 ms 332 KB Output is correct
39 Correct 5 ms 332 KB Output is correct
40 Correct 4 ms 332 KB Output is correct
41 Correct 4 ms 332 KB Output is correct
42 Correct 5 ms 460 KB Output is correct
43 Correct 5 ms 332 KB Output is correct
44 Correct 5 ms 452 KB Output is correct
45 Correct 4 ms 452 KB Output is correct
46 Correct 5 ms 332 KB Output is correct
47 Correct 6 ms 452 KB Output is correct
48 Correct 4 ms 460 KB Output is correct
49 Correct 4 ms 460 KB Output is correct
50 Correct 5 ms 332 KB Output is correct
51 Correct 3 ms 452 KB Output is correct
52 Correct 5 ms 460 KB Output is correct

Subtask #4
65.0 / 65.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 332 KB Output is correct
15 Correct 1 ms 332 KB Output is correct
16 Correct 1 ms 332 KB Output is correct
17 Correct 1 ms 332 KB Output is correct
18 Correct 1 ms 332 KB Output is correct
19 Correct 1 ms 332 KB Output is correct
20 Correct 1 ms 332 KB Output is correct
21 Correct 1 ms 332 KB Output is correct
22 Correct 1 ms 332 KB Output is correct
23 Correct 1 ms 332 KB Output is correct
24 Correct 2 ms 332 KB Output is correct
25 Correct 1 ms 332 KB Output is correct
26 Correct 1 ms 332 KB Output is correct
27 Correct 1 ms 332 KB Output is correct
28 Correct 1 ms 332 KB Output is correct
29 Correct 1 ms 332 KB Output is correct
30 Correct 1 ms 332 KB Output is correct
31 Correct 1 ms 332 KB Output is correct
32 Correct 1 ms 332 KB Output is correct
33 Correct 1 ms 332 KB Output is correct
34 Correct 5 ms 332 KB Output is correct
35 Correct 6 ms 460 KB Output is correct
36 Correct 5 ms 332 KB Output is correct
37 Correct 5 ms 456 KB Output is correct
38 Correct 4 ms 332 KB Output is correct
39 Correct 5 ms 332 KB Output is correct
40 Correct 4 ms 332 KB Output is correct
41 Correct 4 ms 332 KB Output is correct
42 Correct 5 ms 460 KB Output is correct
43 Correct 5 ms 332 KB Output is correct
44 Correct 5 ms 452 KB Output is correct
45 Correct 4 ms 452 KB Output is correct
46 Correct 5 ms 332 KB Output is correct
47 Correct 6 ms 452 KB Output is correct
48 Correct 4 ms 460 KB Output is correct
49 Correct 4 ms 460 KB Output is correct
50 Correct 5 ms 332 KB Output is correct
51 Correct 3 ms 452 KB Output is correct
52 Correct 5 ms 460 KB Output is correct
53 Correct 1203 ms 14220 KB Output is correct
54 Correct 1219 ms 14880 KB Output is correct
55 Correct 1075 ms 14280 KB Output is correct
56 Correct 1121 ms 14348 KB Output is correct
57 Correct 946 ms 14524 KB Output is correct
58 Correct 908 ms 14688 KB Output is correct
59 Correct 960 ms 14332 KB Output is correct
60 Correct 988 ms 14340 KB Output is correct
61 Correct 1103 ms 14444 KB Output is correct
62 Correct 1016 ms 14604 KB Output is correct
63 Correct 1086 ms 14292 KB Output is correct
64 Correct 847 ms 14324 KB Output is correct
65 Correct 1078 ms 13888 KB Output is correct
66 Correct 999 ms 14216 KB Output is correct
67 Correct 1040 ms 14168 KB Output is correct
68 Correct 821 ms 13636 KB Output is correct
69 Correct 917 ms 14664 KB Output is correct
70 Correct 865 ms 13724 KB Output is correct
71 Correct 1229 ms 14780 KB Output is correct
72 Correct 796 ms 14776 KB Output is correct
73 Correct 1207 ms 14884 KB Output is correct