oj.uz

Submission #292622

# Submission time Handle Problem Language Result Execution time Memory
292622 2020-09-07T10:59:18 Z kdh9949 Monochrome Points (JOI20_monochrome) C++17
100 / 100
 936 ms 8708 KB 
#include <bits/stdc++.h>
using namespace std;

using ll = long long;
using ld = long double;
using pii = pair<int, int>;
using pil = pair<int, ll>;
using pli = pair<ll, int>;
using pll = pair<ll, ll>;

using vint = vector<int>;
using vll = vector<ll>;
using vld = vector<ld>;
using vpii = vector<pii>;
using vpil = vector<pil>;
using vpli = vector<pli>;
using vpll = vector<pll>;

#define x first
#define y second
#define all(v) v.begin(),v.end()

namespace BIT {
  int n;
  vint d;
  void i(int n_) { n = n_; d = vint(n + 1); }
  void u(int x, int v){ for(x++; x <= n; x += x & -x) d[x] += v; }
  int g(int x){ int r = 0; for(x++; x; x &= x - 1) r += d[x]; return r; }
  int g(int s, int e) { return g(e) - g(s - 1); }
}

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);

  int n;
  string s;
  cin >> n >> s;

  vint w, b;
  for(int i = 0; i < 2 * n; i++) (s[i] == 'W' ? w : b).push_back(i);

  ll ans = 0;
  vll memo(n, -1LL);
  auto f = [&](int t) {
    if(memo[t] >= 0) return memo[t];

    vint mat(2 * n);
    for(int i = 0; i < n; i++) {
      int A = w[i], B = b[(i + t) % n];
      mat[A] = B;
      mat[B] = A;
    }

    BIT::i(2 * n);
    ll cur = 0;
    for(int i = 0; i < 2 * n; i++) {
      if(i < mat[i]) BIT::u(i, 1);
      else {
        cur += BIT::g(mat[i] + 1, i - 1);
        BIT::u(mat[i], -1);
      }
    }

    ans = max(ans, cur);
    return memo[t] = cur;
  };

  if(n <= 4000) {
    for(int i = 0; i < n; i++) f(i);
    cout << ans << '\n';
  }
  else {
    int st = (f(0) < f(1));
    int en = (f(n - 2) < f(n - 1));
    if(st != en) {
      int l = 0, r = n - 2;
      while(l < r) {
        int m = (l + r + 1) / 2;
        if(f(m) < f(m + 1)) l = m;
        else r = m - 1;
      }
    }
    else if(st == 0) {
      int l = 0, r = n - 2;
      for(; ; l += (n / 20)) if(f(l) < f(l + 1)) break;
      while(l < r) {
        int m = (l + r + 1) / 2;
        if(f(m) < f(m + 1)) l = m;
        else r = m - 1;
      }
    }
    else{
      int l = 0, r = n - 2;
      for(; ; r -= (n / 20)) if(f(r) >= f(r + 1)) break;
      while(l < r) {
        int m = (l + r + 1) / 2;
        if(f(m) < f(m + 1)) l = m;
        else r = m - 1;
      }
    }
    cout << ans << '\n';
  }
  return 0;
}

Subtask #1
4.0 / 4.0

# 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 0 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 0 ms 384 KB Output is correct
7 Correct 0 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 1 ms 384 KB Output is correct
13 Correct 0 ms 384 KB Output is correct

Subtask #2
21.0 / 21.0

# 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 0 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 0 ms 384 KB Output is correct
7 Correct 0 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 1 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 6 ms 384 KB Output is correct
16 Correct 6 ms 384 KB Output is correct
17 Correct 7 ms 384 KB Output is correct
18 Correct 4 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 5 ms 384 KB Output is correct
22 Correct 5 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 4 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 5 ms 384 KB Output is correct
29 Correct 4 ms 384 KB Output is correct
30 Correct 4 ms 384 KB Output is correct
31 Correct 5 ms 384 KB Output is correct
32 Correct 5 ms 384 KB Output is correct
33 Correct 5 ms 384 KB Output is correct

Subtask #3
10.0 / 10.0

# 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 0 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 0 ms 384 KB Output is correct
7 Correct 0 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 1 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 6 ms 384 KB Output is correct
16 Correct 6 ms 384 KB Output is correct
17 Correct 7 ms 384 KB Output is correct
18 Correct 4 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 5 ms 384 KB Output is correct
22 Correct 5 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 4 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 5 ms 384 KB Output is correct
29 Correct 4 ms 384 KB Output is correct
30 Correct 4 ms 384 KB Output is correct
31 Correct 5 ms 384 KB Output is correct
32 Correct 5 ms 384 KB Output is correct
33 Correct 5 ms 384 KB Output is correct
34 Correct 283 ms 384 KB Output is correct
35 Correct 280 ms 384 KB Output is correct
36 Correct 270 ms 472 KB Output is correct
37 Correct 251 ms 384 KB Output is correct
38 Correct 197 ms 476 KB Output is correct
39 Correct 226 ms 384 KB Output is correct
40 Correct 200 ms 384 KB Output is correct
41 Correct 195 ms 504 KB Output is correct
42 Correct 268 ms 384 KB Output is correct
43 Correct 235 ms 384 KB Output is correct
44 Correct 211 ms 408 KB Output is correct
45 Correct 225 ms 504 KB Output is correct
46 Correct 256 ms 476 KB Output is correct
47 Correct 240 ms 504 KB Output is correct
48 Correct 234 ms 480 KB Output is correct
49 Correct 194 ms 504 KB Output is correct
50 Correct 227 ms 384 KB Output is correct
51 Correct 227 ms 472 KB Output is correct
52 Correct 231 ms 504 KB Output is correct

Subtask #4
65.0 / 65.0

# 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 0 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 0 ms 384 KB Output is correct
7 Correct 0 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 1 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 6 ms 384 KB Output is correct
16 Correct 6 ms 384 KB Output is correct
17 Correct 7 ms 384 KB Output is correct
18 Correct 4 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 5 ms 384 KB Output is correct
22 Correct 5 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 4 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 5 ms 384 KB Output is correct
29 Correct 4 ms 384 KB Output is correct
30 Correct 4 ms 384 KB Output is correct
31 Correct 5 ms 384 KB Output is correct
32 Correct 5 ms 384 KB Output is correct
33 Correct 5 ms 384 KB Output is correct
34 Correct 283 ms 384 KB Output is correct
35 Correct 280 ms 384 KB Output is correct
36 Correct 270 ms 472 KB Output is correct
37 Correct 251 ms 384 KB Output is correct
38 Correct 197 ms 476 KB Output is correct
39 Correct 226 ms 384 KB Output is correct
40 Correct 200 ms 384 KB Output is correct
41 Correct 195 ms 504 KB Output is correct
42 Correct 268 ms 384 KB Output is correct
43 Correct 235 ms 384 KB Output is correct
44 Correct 211 ms 408 KB Output is correct
45 Correct 225 ms 504 KB Output is correct
46 Correct 256 ms 476 KB Output is correct
47 Correct 240 ms 504 KB Output is correct
48 Correct 234 ms 480 KB Output is correct
49 Correct 194 ms 504 KB Output is correct
50 Correct 227 ms 384 KB Output is correct
51 Correct 227 ms 472 KB Output is correct
52 Correct 231 ms 504 KB Output is correct
53 Correct 720 ms 8624 KB Output is correct
54 Correct 714 ms 8708 KB Output is correct
55 Correct 688 ms 8316 KB Output is correct
56 Correct 682 ms 8352 KB Output is correct
57 Correct 695 ms 8472 KB Output is correct
58 Correct 795 ms 8652 KB Output is correct
59 Correct 661 ms 8276 KB Output is correct
60 Correct 660 ms 8376 KB Output is correct
61 Correct 673 ms 8348 KB Output is correct
62 Correct 669 ms 8468 KB Output is correct
63 Correct 672 ms 8364 KB Output is correct
64 Correct 844 ms 8384 KB Output is correct
65 Correct 620 ms 8012 KB Output is correct
66 Correct 925 ms 8180 KB Output is correct
67 Correct 936 ms 8212 KB Output is correct
68 Correct 895 ms 7928 KB Output is correct
69 Correct 743 ms 8556 KB Output is correct
70 Correct 754 ms 7876 KB Output is correct
71 Correct 664 ms 8644 KB Output is correct
72 Correct 663 ms 8548 KB Output is correct
73 Correct 682 ms 8632 KB Output is correct