#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int N = 2e5 + 5;
int a[2*N];
ll dp[N];
int ord[N];
ll solve(int n, int i) {
if (i >= n)
return 0;
i = ord[i];
//if (dp[i] != 0)
// return dp[i];
int ptr[2] = {i+n, i+n}, cnt[4] = {0, 0, 0, 0};
// auto next = [&](int& j) {
// j = j+1 < 2*n ? j+1 : j+1-2*n;
// };
#define next(x) x = x+1 < 2*n ? x+1 : x+1-2*n
ll val = 0;
for (int j = i, c = a[i]; j < i+n; c = a[++j]) {
while (ptr[c] != i && a[ptr[c]] == c)
cnt[c+2]++, next(ptr[c]);
next(ptr[c]);
val += min(cnt[c+2], cnt[c^1]) + cnt[c]++;
}
return dp[i] = val;
}
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int get(int l, int r) {
return uniform_int_distribution<int>(l, r)(rng);
}
int main() {
ios_base::sync_with_stdio(false); cin.tie(0);
auto cur_t = clock();
int n; cin >> n;
string s; cin >> s;
for (int i = 0; i < 2*n; i++)
a[i] = s[i] == 'B', ord[i] = i;
shuffle(ord, ord+n, rng);
ll ans = 0;
int i = 0;
while (clock() - cur_t < 1994000) {
ans = max(ans, solve(n, i++));
}
cout << ans << "\n";
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1995 ms |
408 KB |
Output is correct |
| 2 |
Correct |
1995 ms |
408 KB |
Output is correct |
| 3 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 4 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 5 |
Correct |
1995 ms |
408 KB |
Output is correct |
| 6 |
Correct |
1995 ms |
408 KB |
Output is correct |
| 7 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 8 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 9 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 10 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 11 |
Correct |
1995 ms |
408 KB |
Output is correct |
| 12 |
Correct |
1995 ms |
400 KB |
Output is correct |
| 13 |
Correct |
1995 ms |
400 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1995 ms |
408 KB |
Output is correct |
| 2 |
Correct |
1995 ms |
408 KB |
Output is correct |
| 3 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 4 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 5 |
Correct |
1995 ms |
408 KB |
Output is correct |
| 6 |
Correct |
1995 ms |
408 KB |
Output is correct |
| 7 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 8 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 9 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 10 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 11 |
Correct |
1995 ms |
408 KB |
Output is correct |
| 12 |
Correct |
1995 ms |
400 KB |
Output is correct |
| 13 |
Correct |
1995 ms |
400 KB |
Output is correct |
| 14 |
Correct |
1995 ms |
400 KB |
Output is correct |
| 15 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 16 |
Correct |
1995 ms |
408 KB |
Output is correct |
| 17 |
Correct |
1995 ms |
408 KB |
Output is correct |
| 18 |
Correct |
1995 ms |
408 KB |
Output is correct |
| 19 |
Correct |
1995 ms |
400 KB |
Output is correct |
| 20 |
Correct |
1995 ms |
400 KB |
Output is correct |
| 21 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 22 |
Correct |
1995 ms |
384 KB |
Output is correct |
| 23 |
Correct |
1995 ms |
408 KB |
Output is correct |
| 24 |
Correct |
1995 ms |
408 KB |
Output is correct |
| 25 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 26 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 27 |
Correct |
1995 ms |
400 KB |
Output is correct |
| 28 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 29 |
Correct |
1995 ms |
504 KB |
Output is correct |
| 30 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 31 |
Correct |
1995 ms |
480 KB |
Output is correct |
| 32 |
Correct |
1995 ms |
400 KB |
Output is correct |
| 33 |
Correct |
1995 ms |
404 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1995 ms |
408 KB |
Output is correct |
| 2 |
Correct |
1995 ms |
408 KB |
Output is correct |
| 3 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 4 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 5 |
Correct |
1995 ms |
408 KB |
Output is correct |
| 6 |
Correct |
1995 ms |
408 KB |
Output is correct |
| 7 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 8 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 9 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 10 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 11 |
Correct |
1995 ms |
408 KB |
Output is correct |
| 12 |
Correct |
1995 ms |
400 KB |
Output is correct |
| 13 |
Correct |
1995 ms |
400 KB |
Output is correct |
| 14 |
Correct |
1995 ms |
400 KB |
Output is correct |
| 15 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 16 |
Correct |
1995 ms |
408 KB |
Output is correct |
| 17 |
Correct |
1995 ms |
408 KB |
Output is correct |
| 18 |
Correct |
1995 ms |
408 KB |
Output is correct |
| 19 |
Correct |
1995 ms |
400 KB |
Output is correct |
| 20 |
Correct |
1995 ms |
400 KB |
Output is correct |
| 21 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 22 |
Correct |
1995 ms |
384 KB |
Output is correct |
| 23 |
Correct |
1995 ms |
408 KB |
Output is correct |
| 24 |
Correct |
1995 ms |
408 KB |
Output is correct |
| 25 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 26 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 27 |
Correct |
1995 ms |
400 KB |
Output is correct |
| 28 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 29 |
Correct |
1995 ms |
504 KB |
Output is correct |
| 30 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 31 |
Correct |
1995 ms |
480 KB |
Output is correct |
| 32 |
Correct |
1995 ms |
400 KB |
Output is correct |
| 33 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 34 |
Correct |
1995 ms |
452 KB |
Output is correct |
| 35 |
Correct |
1995 ms |
504 KB |
Output is correct |
| 36 |
Correct |
1995 ms |
504 KB |
Output is correct |
| 37 |
Correct |
1995 ms |
456 KB |
Output is correct |
| 38 |
Correct |
1995 ms |
448 KB |
Output is correct |
| 39 |
Correct |
1995 ms |
452 KB |
Output is correct |
| 40 |
Correct |
1995 ms |
444 KB |
Output is correct |
| 41 |
Correct |
1995 ms |
448 KB |
Output is correct |
| 42 |
Correct |
1995 ms |
460 KB |
Output is correct |
| 43 |
Correct |
1995 ms |
504 KB |
Output is correct |
| 44 |
Correct |
1995 ms |
448 KB |
Output is correct |
| 45 |
Correct |
1995 ms |
448 KB |
Output is correct |
| 46 |
Correct |
1995 ms |
452 KB |
Output is correct |
| 47 |
Correct |
1995 ms |
456 KB |
Output is correct |
| 48 |
Correct |
1995 ms |
448 KB |
Output is correct |
| 49 |
Correct |
1995 ms |
448 KB |
Output is correct |
| 50 |
Correct |
1995 ms |
384 KB |
Output is correct |
| 51 |
Correct |
1995 ms |
504 KB |
Output is correct |
| 52 |
Correct |
1995 ms |
384 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1995 ms |
408 KB |
Output is correct |
| 2 |
Correct |
1995 ms |
408 KB |
Output is correct |
| 3 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 4 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 5 |
Correct |
1995 ms |
408 KB |
Output is correct |
| 6 |
Correct |
1995 ms |
408 KB |
Output is correct |
| 7 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 8 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 9 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 10 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 11 |
Correct |
1995 ms |
408 KB |
Output is correct |
| 12 |
Correct |
1995 ms |
400 KB |
Output is correct |
| 13 |
Correct |
1995 ms |
400 KB |
Output is correct |
| 14 |
Correct |
1995 ms |
400 KB |
Output is correct |
| 15 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 16 |
Correct |
1995 ms |
408 KB |
Output is correct |
| 17 |
Correct |
1995 ms |
408 KB |
Output is correct |
| 18 |
Correct |
1995 ms |
408 KB |
Output is correct |
| 19 |
Correct |
1995 ms |
400 KB |
Output is correct |
| 20 |
Correct |
1995 ms |
400 KB |
Output is correct |
| 21 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 22 |
Correct |
1995 ms |
384 KB |
Output is correct |
| 23 |
Correct |
1995 ms |
408 KB |
Output is correct |
| 24 |
Correct |
1995 ms |
408 KB |
Output is correct |
| 25 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 26 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 27 |
Correct |
1995 ms |
400 KB |
Output is correct |
| 28 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 29 |
Correct |
1995 ms |
504 KB |
Output is correct |
| 30 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 31 |
Correct |
1995 ms |
480 KB |
Output is correct |
| 32 |
Correct |
1995 ms |
400 KB |
Output is correct |
| 33 |
Correct |
1995 ms |
404 KB |
Output is correct |
| 34 |
Correct |
1995 ms |
452 KB |
Output is correct |
| 35 |
Correct |
1995 ms |
504 KB |
Output is correct |
| 36 |
Correct |
1995 ms |
504 KB |
Output is correct |
| 37 |
Correct |
1995 ms |
456 KB |
Output is correct |
| 38 |
Correct |
1995 ms |
448 KB |
Output is correct |
| 39 |
Correct |
1995 ms |
452 KB |
Output is correct |
| 40 |
Correct |
1995 ms |
444 KB |
Output is correct |
| 41 |
Correct |
1995 ms |
448 KB |
Output is correct |
| 42 |
Correct |
1995 ms |
460 KB |
Output is correct |
| 43 |
Correct |
1995 ms |
504 KB |
Output is correct |
| 44 |
Correct |
1995 ms |
448 KB |
Output is correct |
| 45 |
Correct |
1995 ms |
448 KB |
Output is correct |
| 46 |
Correct |
1995 ms |
452 KB |
Output is correct |
| 47 |
Correct |
1995 ms |
456 KB |
Output is correct |
| 48 |
Correct |
1995 ms |
448 KB |
Output is correct |
| 49 |
Correct |
1995 ms |
448 KB |
Output is correct |
| 50 |
Correct |
1995 ms |
384 KB |
Output is correct |
| 51 |
Correct |
1995 ms |
504 KB |
Output is correct |
| 52 |
Correct |
1995 ms |
384 KB |
Output is correct |
| 53 |
Correct |
1998 ms |
4792 KB |
Output is correct |
| 54 |
Correct |
1997 ms |
4848 KB |
Output is correct |
| 55 |
Correct |
1996 ms |
4624 KB |
Output is correct |
| 56 |
Correct |
1998 ms |
4876 KB |
Output is correct |
| 57 |
Correct |
1997 ms |
4616 KB |
Output is correct |
| 58 |
Incorrect |
1997 ms |
4748 KB |
Output isn't correct |
| 59 |
Halted |
0 ms |
0 KB |
- |
