#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
const int N = (int) 2e5 + 7;
int n;
string s;
vector<int> a;
vector<int> b;
int t[2 * N];
void clr()
{
for (int i = 1; i <= 2 * n; i++)
{
t[i] = 0;
}
}
void add(int i, int x)
{
i++;
while (i <= 2 * n)
{
t[i] += x;
i += i & (-i);
}
}
int sum(int i)
{
i++;
int sol = 0;
while (i)
{
sol += t[i];
i -= i & (-i);
}
return sol;
}
int sum(int i, int j)
{
return sum(j) - sum(i - 1);
}
ll get(int k)
{
vector<pair<int, int>> p;
for (int i = 0; i < n; i++)
{
p.push_back({a[i], b[(i + k) % n]});
}
for (auto &it : p)
{
if (it.second < it.first)
{
swap(it.first, it.second);
}
}
sort(p.begin(), p.end());
ll sol = 0;
clr();
for (int i = 0; i < (int) p.size(); i++)
{
sol += sum(p[i].first, p[i].second);
add(p[i].second, +1);
}
return sol;
}
int main()
{
ios::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);
}
else
{
b.push_back(i);
}
}
ll sol = 0;
for (int k = 0; k < n; k++)
{
sol = max(sol, get(k));
}
cout << sol << "\n";
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
384 KB |
Output is correct |
2 |
Correct |
0 ms |
384 KB |
Output is correct |
3 |
Correct |
1 ms |
384 KB |
Output is correct |
4 |
Correct |
1 ms |
512 KB |
Output is correct |
5 |
Correct |
0 ms |
384 KB |
Output is correct |
6 |
Correct |
0 ms |
384 KB |
Output is correct |
7 |
Correct |
1 ms |
384 KB |
Output is correct |
8 |
Correct |
0 ms |
384 KB |
Output is correct |
9 |
Correct |
0 ms |
384 KB |
Output is correct |
10 |
Correct |
0 ms |
384 KB |
Output is correct |
11 |
Correct |
0 ms |
384 KB |
Output is correct |
12 |
Correct |
0 ms |
384 KB |
Output is correct |
13 |
Correct |
0 ms |
384 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
384 KB |
Output is correct |
2 |
Correct |
0 ms |
384 KB |
Output is correct |
3 |
Correct |
1 ms |
384 KB |
Output is correct |
4 |
Correct |
1 ms |
512 KB |
Output is correct |
5 |
Correct |
0 ms |
384 KB |
Output is correct |
6 |
Correct |
0 ms |
384 KB |
Output is correct |
7 |
Correct |
1 ms |
384 KB |
Output is correct |
8 |
Correct |
0 ms |
384 KB |
Output is correct |
9 |
Correct |
0 ms |
384 KB |
Output is correct |
10 |
Correct |
0 ms |
384 KB |
Output is correct |
11 |
Correct |
0 ms |
384 KB |
Output is correct |
12 |
Correct |
0 ms |
384 KB |
Output is correct |
13 |
Correct |
0 ms |
384 KB |
Output is correct |
14 |
Correct |
6 ms |
384 KB |
Output is correct |
15 |
Correct |
7 ms |
384 KB |
Output is correct |
16 |
Correct |
6 ms |
384 KB |
Output is correct |
17 |
Correct |
6 ms |
384 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 |
6 ms |
384 KB |
Output is correct |
22 |
Correct |
6 ms |
384 KB |
Output is correct |
23 |
Correct |
3 ms |
384 KB |
Output is correct |
24 |
Correct |
5 ms |
384 KB |
Output is correct |
25 |
Correct |
5 ms |
384 KB |
Output is correct |
26 |
Correct |
5 ms |
384 KB |
Output is correct |
27 |
Correct |
5 ms |
384 KB |
Output is correct |
28 |
Correct |
6 ms |
384 KB |
Output is correct |
29 |
Correct |
5 ms |
384 KB |
Output is correct |
30 |
Correct |
5 ms |
384 KB |
Output is correct |
31 |
Correct |
6 ms |
384 KB |
Output is correct |
32 |
Correct |
5 ms |
384 KB |
Output is correct |
33 |
Correct |
6 ms |
384 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
384 KB |
Output is correct |
2 |
Correct |
0 ms |
384 KB |
Output is correct |
3 |
Correct |
1 ms |
384 KB |
Output is correct |
4 |
Correct |
1 ms |
512 KB |
Output is correct |
5 |
Correct |
0 ms |
384 KB |
Output is correct |
6 |
Correct |
0 ms |
384 KB |
Output is correct |
7 |
Correct |
1 ms |
384 KB |
Output is correct |
8 |
Correct |
0 ms |
384 KB |
Output is correct |
9 |
Correct |
0 ms |
384 KB |
Output is correct |
10 |
Correct |
0 ms |
384 KB |
Output is correct |
11 |
Correct |
0 ms |
384 KB |
Output is correct |
12 |
Correct |
0 ms |
384 KB |
Output is correct |
13 |
Correct |
0 ms |
384 KB |
Output is correct |
14 |
Correct |
6 ms |
384 KB |
Output is correct |
15 |
Correct |
7 ms |
384 KB |
Output is correct |
16 |
Correct |
6 ms |
384 KB |
Output is correct |
17 |
Correct |
6 ms |
384 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 |
6 ms |
384 KB |
Output is correct |
22 |
Correct |
6 ms |
384 KB |
Output is correct |
23 |
Correct |
3 ms |
384 KB |
Output is correct |
24 |
Correct |
5 ms |
384 KB |
Output is correct |
25 |
Correct |
5 ms |
384 KB |
Output is correct |
26 |
Correct |
5 ms |
384 KB |
Output is correct |
27 |
Correct |
5 ms |
384 KB |
Output is correct |
28 |
Correct |
6 ms |
384 KB |
Output is correct |
29 |
Correct |
5 ms |
384 KB |
Output is correct |
30 |
Correct |
5 ms |
384 KB |
Output is correct |
31 |
Correct |
6 ms |
384 KB |
Output is correct |
32 |
Correct |
5 ms |
384 KB |
Output is correct |
33 |
Correct |
6 ms |
384 KB |
Output is correct |
34 |
Correct |
304 ms |
384 KB |
Output is correct |
35 |
Correct |
310 ms |
384 KB |
Output is correct |
36 |
Correct |
297 ms |
384 KB |
Output is correct |
37 |
Correct |
281 ms |
504 KB |
Output is correct |
38 |
Correct |
230 ms |
384 KB |
Output is correct |
39 |
Correct |
253 ms |
460 KB |
Output is correct |
40 |
Correct |
222 ms |
504 KB |
Output is correct |
41 |
Correct |
212 ms |
460 KB |
Output is correct |
42 |
Correct |
292 ms |
504 KB |
Output is correct |
43 |
Correct |
252 ms |
384 KB |
Output is correct |
44 |
Correct |
257 ms |
384 KB |
Output is correct |
45 |
Correct |
267 ms |
508 KB |
Output is correct |
46 |
Correct |
289 ms |
384 KB |
Output is correct |
47 |
Correct |
243 ms |
504 KB |
Output is correct |
48 |
Correct |
242 ms |
384 KB |
Output is correct |
49 |
Correct |
202 ms |
384 KB |
Output is correct |
50 |
Correct |
260 ms |
504 KB |
Output is correct |
51 |
Correct |
206 ms |
384 KB |
Output is correct |
52 |
Correct |
305 ms |
384 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
384 KB |
Output is correct |
2 |
Correct |
0 ms |
384 KB |
Output is correct |
3 |
Correct |
1 ms |
384 KB |
Output is correct |
4 |
Correct |
1 ms |
512 KB |
Output is correct |
5 |
Correct |
0 ms |
384 KB |
Output is correct |
6 |
Correct |
0 ms |
384 KB |
Output is correct |
7 |
Correct |
1 ms |
384 KB |
Output is correct |
8 |
Correct |
0 ms |
384 KB |
Output is correct |
9 |
Correct |
0 ms |
384 KB |
Output is correct |
10 |
Correct |
0 ms |
384 KB |
Output is correct |
11 |
Correct |
0 ms |
384 KB |
Output is correct |
12 |
Correct |
0 ms |
384 KB |
Output is correct |
13 |
Correct |
0 ms |
384 KB |
Output is correct |
14 |
Correct |
6 ms |
384 KB |
Output is correct |
15 |
Correct |
7 ms |
384 KB |
Output is correct |
16 |
Correct |
6 ms |
384 KB |
Output is correct |
17 |
Correct |
6 ms |
384 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 |
6 ms |
384 KB |
Output is correct |
22 |
Correct |
6 ms |
384 KB |
Output is correct |
23 |
Correct |
3 ms |
384 KB |
Output is correct |
24 |
Correct |
5 ms |
384 KB |
Output is correct |
25 |
Correct |
5 ms |
384 KB |
Output is correct |
26 |
Correct |
5 ms |
384 KB |
Output is correct |
27 |
Correct |
5 ms |
384 KB |
Output is correct |
28 |
Correct |
6 ms |
384 KB |
Output is correct |
29 |
Correct |
5 ms |
384 KB |
Output is correct |
30 |
Correct |
5 ms |
384 KB |
Output is correct |
31 |
Correct |
6 ms |
384 KB |
Output is correct |
32 |
Correct |
5 ms |
384 KB |
Output is correct |
33 |
Correct |
6 ms |
384 KB |
Output is correct |
34 |
Correct |
304 ms |
384 KB |
Output is correct |
35 |
Correct |
310 ms |
384 KB |
Output is correct |
36 |
Correct |
297 ms |
384 KB |
Output is correct |
37 |
Correct |
281 ms |
504 KB |
Output is correct |
38 |
Correct |
230 ms |
384 KB |
Output is correct |
39 |
Correct |
253 ms |
460 KB |
Output is correct |
40 |
Correct |
222 ms |
504 KB |
Output is correct |
41 |
Correct |
212 ms |
460 KB |
Output is correct |
42 |
Correct |
292 ms |
504 KB |
Output is correct |
43 |
Correct |
252 ms |
384 KB |
Output is correct |
44 |
Correct |
257 ms |
384 KB |
Output is correct |
45 |
Correct |
267 ms |
508 KB |
Output is correct |
46 |
Correct |
289 ms |
384 KB |
Output is correct |
47 |
Correct |
243 ms |
504 KB |
Output is correct |
48 |
Correct |
242 ms |
384 KB |
Output is correct |
49 |
Correct |
202 ms |
384 KB |
Output is correct |
50 |
Correct |
260 ms |
504 KB |
Output is correct |
51 |
Correct |
206 ms |
384 KB |
Output is correct |
52 |
Correct |
305 ms |
384 KB |
Output is correct |
53 |
Execution timed out |
2064 ms |
8168 KB |
Time limit exceeded |
54 |
Halted |
0 ms |
0 KB |
- |