#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
using pi = pair<pair<int, int>, pair<int, int>>;
#define ff first
#define ss second
#define pb push_back
#define all(x) (x).begin(), (x).end()
#define lb lower_bound
int N, ST[400005]; string S;
vector<int> A, B;
void update(int p, int v) {
for(; p <= 2 * N; p += (p & (-p)))
ST[p] += v;
}
int query(int p) {
int res = 0;
for(; p; p -= (p & (-p)))
res += ST[p];
return res;
}
int query(int lo, int hi) {
return query(hi) - query(lo - 1);
}
int solve(int v) {
vector<pair<int, int>> P;
for(int l = 0; l < N; l++)
P.push_back({A[l], B[(l + v) % N]});
int arr[2 * N]{0};
for(int l = 0; l < N; l++) {
arr[A[l]] = l, arr[B[(l + v) % N]] = l;
}
for(int l = 0; l <= 2 * N; l++) ST[l] = 0;
int res = 0; unordered_map<int, int> M;
for(int l = 0; l < 2 * N; l++) {
if(M.find(arr[l]) != M.end()) {
int i = M[arr[l]];
update(i, -1); res += query(i, l + 1);
continue;
}
update(l + 1, 1); M[arr[l]] = l + 1;
}
return res;
}
int32_t main() {
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
cin >> N >> S; int res = 0;
for(int l = 0; l < 2 * N; l++) {
if(S[l] == 'B') A.push_back(l);
if(S[l] == 'W') B.push_back(l);
}
int lo = 0, hi = N - 1;
while(lo <= hi) {
int md = (lo + hi) / 2;
int U = solve(md), V = solve(md + 1);
if(V > U) { lo = md + 1, res = max(res, V); }
else hi = md - 1, res = max(res, U);
}
cout << res << "\n";
return 0;
}
# |
Verdict |
Execution time |
Memory |
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 |
0 ms |
212 KB |
Output is correct |
7 |
Correct |
0 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 |
1 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 |
# |
Verdict |
Execution time |
Memory |
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 |
0 ms |
212 KB |
Output is correct |
7 |
Correct |
0 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 |
1 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 |
1 ms |
340 KB |
Output is correct |
15 |
Correct |
1 ms |
340 KB |
Output is correct |
16 |
Correct |
1 ms |
340 KB |
Output is correct |
17 |
Correct |
1 ms |
340 KB |
Output is correct |
18 |
Correct |
1 ms |
340 KB |
Output is correct |
19 |
Correct |
1 ms |
340 KB |
Output is correct |
20 |
Correct |
1 ms |
340 KB |
Output is correct |
21 |
Correct |
1 ms |
340 KB |
Output is correct |
22 |
Correct |
1 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 |
2 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 |
1 ms |
340 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
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 |
0 ms |
212 KB |
Output is correct |
7 |
Correct |
0 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 |
1 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 |
1 ms |
340 KB |
Output is correct |
15 |
Correct |
1 ms |
340 KB |
Output is correct |
16 |
Correct |
1 ms |
340 KB |
Output is correct |
17 |
Correct |
1 ms |
340 KB |
Output is correct |
18 |
Correct |
1 ms |
340 KB |
Output is correct |
19 |
Correct |
1 ms |
340 KB |
Output is correct |
20 |
Correct |
1 ms |
340 KB |
Output is correct |
21 |
Correct |
1 ms |
340 KB |
Output is correct |
22 |
Correct |
1 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 |
2 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 |
1 ms |
340 KB |
Output is correct |
34 |
Correct |
7 ms |
476 KB |
Output is correct |
35 |
Correct |
7 ms |
468 KB |
Output is correct |
36 |
Correct |
6 ms |
476 KB |
Output is correct |
37 |
Correct |
6 ms |
468 KB |
Output is correct |
38 |
Correct |
5 ms |
340 KB |
Output is correct |
39 |
Correct |
6 ms |
468 KB |
Output is correct |
40 |
Correct |
6 ms |
468 KB |
Output is correct |
41 |
Correct |
5 ms |
340 KB |
Output is correct |
42 |
Correct |
7 ms |
480 KB |
Output is correct |
43 |
Correct |
8 ms |
488 KB |
Output is correct |
44 |
Correct |
6 ms |
468 KB |
Output is correct |
45 |
Correct |
7 ms |
468 KB |
Output is correct |
46 |
Correct |
8 ms |
468 KB |
Output is correct |
47 |
Correct |
7 ms |
468 KB |
Output is correct |
48 |
Correct |
7 ms |
596 KB |
Output is correct |
49 |
Correct |
5 ms |
340 KB |
Output is correct |
50 |
Correct |
6 ms |
468 KB |
Output is correct |
51 |
Correct |
6 ms |
480 KB |
Output is correct |
52 |
Correct |
6 ms |
476 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
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 |
0 ms |
212 KB |
Output is correct |
7 |
Correct |
0 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 |
1 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 |
1 ms |
340 KB |
Output is correct |
15 |
Correct |
1 ms |
340 KB |
Output is correct |
16 |
Correct |
1 ms |
340 KB |
Output is correct |
17 |
Correct |
1 ms |
340 KB |
Output is correct |
18 |
Correct |
1 ms |
340 KB |
Output is correct |
19 |
Correct |
1 ms |
340 KB |
Output is correct |
20 |
Correct |
1 ms |
340 KB |
Output is correct |
21 |
Correct |
1 ms |
340 KB |
Output is correct |
22 |
Correct |
1 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 |
2 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 |
1 ms |
340 KB |
Output is correct |
34 |
Correct |
7 ms |
476 KB |
Output is correct |
35 |
Correct |
7 ms |
468 KB |
Output is correct |
36 |
Correct |
6 ms |
476 KB |
Output is correct |
37 |
Correct |
6 ms |
468 KB |
Output is correct |
38 |
Correct |
5 ms |
340 KB |
Output is correct |
39 |
Correct |
6 ms |
468 KB |
Output is correct |
40 |
Correct |
6 ms |
468 KB |
Output is correct |
41 |
Correct |
5 ms |
340 KB |
Output is correct |
42 |
Correct |
7 ms |
480 KB |
Output is correct |
43 |
Correct |
8 ms |
488 KB |
Output is correct |
44 |
Correct |
6 ms |
468 KB |
Output is correct |
45 |
Correct |
7 ms |
468 KB |
Output is correct |
46 |
Correct |
8 ms |
468 KB |
Output is correct |
47 |
Correct |
7 ms |
468 KB |
Output is correct |
48 |
Correct |
7 ms |
596 KB |
Output is correct |
49 |
Correct |
5 ms |
340 KB |
Output is correct |
50 |
Correct |
6 ms |
468 KB |
Output is correct |
51 |
Correct |
6 ms |
480 KB |
Output is correct |
52 |
Correct |
6 ms |
476 KB |
Output is correct |
53 |
Incorrect |
1177 ms |
16988 KB |
Output isn't correct |
54 |
Halted |
0 ms |
0 KB |
- |