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Submission #495376

# Submission time Handle Problem Language Result Execution time Memory
495376 2021-12-18T14:26:09 Z 600Mihnea Monochrome Points (JOI20_monochrome) C++17
100 / 100
 41 ms 5028 KB 
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

ll solve(string s) {
  int n = (int) s.size() / 2;
  vector<int> a, b;
  for (int i = 0; i < 2 * n; i++) {
    if (s[i] != s[0]) {
      a.push_back(i);
    }
    else {
      b.push_back(i);
    }
  }
  vector<ll> cnt(n, 0);

  function<void(int, int, int)> add = [&] (int l, int r, int x) {
    if (l <= r) {
      cnt[l] += x;
      if (r + 1 < n) {
        cnt[r + 1] -= x;
      }
    } else {
      add(l, n - 1, x);
      add(0, r, x);
    }
  };

  int pt = 0, pt2 = 0, pt3 = 0;

  for (int i = 0; i < n; i++) {
    while (pt < n && b[pt] < a[i]) {
      pt++;
    }

    while (pt2 < n && a[i] >= n + b[pt2]) {
      pt2++;
    }

    while (pt3 < n && b[pt3] < n + a[i]) {
      pt3++;
    }

    if (pt < pt3) {
      add((n - i + pt) % n, (n - i + pt3 - 1) % n, -a[i]);
    }
    if (pt3 < n) {
      add((n - i + pt3) % n, (n - i + n - 1) % n, 2 * n + a[i]);
    }

    if (0 < pt2) {
      add((n - i) % n, (n - i + pt2 - 1) % n, 2 * n - a[i]);
    }
    if (pt2 < pt) {
      add((n - i + pt2) % n, (n - i + pt - 1) % n, a[i]);
    }

  }


  pt = 0;
  pt2 = 0;
  pt3 = 0;

  for (int j = 0; j < n; j++) {
    while (pt < n && a[pt] < b[j]) {
      pt++;
    }

    while (pt2 < n && b[j] >= n + a[pt2]) {
      pt2++;
    }

    while (pt3 < n && a[pt3] < n + b[j]) {
      pt3++;
    }

    if (0 < pt2) {
      add((n - (pt2 - 1) + j) % n, (n - 0 + j) % n, -b[j]);
    }
    if (pt2 < pt) {
      add((n - (pt - 1) + j) % n, (n - pt2 + j) % n, b[j]);
    }

    if (pt < pt3) {
      add((n - (pt3 - 1) + j) % n, (n - pt + j) % n, -b[j]);
    }

    if (pt3 < n) {
      add((n - (n - 1) + j) % n, (n - pt3 + j) % n, b[j]);
    }

  }


  ll sol = 0, cur = 0;
  for (auto &x : cnt) {
    cur += x;
    sol = max(sol, cur);
  }
  sol -= n;
  return sol / 2;
}

int main() {
  ios::sync_with_stdio(0); cin.tie(0);


  if (0) {
    assert(solve("WWWBWBBBBWWBWWBWWBBWWBBBWBBBWWBW") == 105);
    assert(solve("WBBBWBBWWBWWBWWBWBWB") == 41);
    assert(solve("BWBWBBWBWW") == 8);
    assert(solve("BBWWBW") == 2);

    cout << "ok!\n";
    exit(0);
  }

  int n;
  string s;

  cin >> n >> s;



  cout << solve(s) << "\n";
}

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 0 ms 204 KB Output is correct
10 Correct 0 ms 204 KB Output is correct
11 Correct 0 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 0 ms 204 KB Output is correct

Subtask #2
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 0 ms 204 KB Output is correct
10 Correct 0 ms 204 KB Output is correct
11 Correct 0 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 0 ms 204 KB Output is correct
14 Correct 0 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 0 ms 204 KB Output is correct
17 Correct 1 ms 204 KB Output is correct
18 Correct 1 ms 204 KB Output is correct
19 Correct 0 ms 204 KB Output is correct
20 Correct 1 ms 204 KB Output is correct
21 Correct 1 ms 204 KB Output is correct
22 Correct 1 ms 204 KB Output is correct
23 Correct 0 ms 204 KB Output is correct
24 Correct 0 ms 204 KB Output is correct
25 Correct 0 ms 204 KB Output is correct
26 Correct 0 ms 204 KB Output is correct
27 Correct 0 ms 204 KB Output is correct
28 Correct 0 ms 204 KB Output is correct
29 Correct 1 ms 284 KB Output is correct
30 Correct 0 ms 204 KB Output is correct
31 Correct 0 ms 204 KB Output is correct
32 Correct 0 ms 204 KB Output is correct
33 Correct 0 ms 204 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 0 ms 204 KB Output is correct
10 Correct 0 ms 204 KB Output is correct
11 Correct 0 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 0 ms 204 KB Output is correct
14 Correct 0 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 0 ms 204 KB Output is correct
17 Correct 1 ms 204 KB Output is correct
18 Correct 1 ms 204 KB Output is correct
19 Correct 0 ms 204 KB Output is correct
20 Correct 1 ms 204 KB Output is correct
21 Correct 1 ms 204 KB Output is correct
22 Correct 1 ms 204 KB Output is correct
23 Correct 0 ms 204 KB Output is correct
24 Correct 0 ms 204 KB Output is correct
25 Correct 0 ms 204 KB Output is correct
26 Correct 0 ms 204 KB Output is correct
27 Correct 0 ms 204 KB Output is correct
28 Correct 0 ms 204 KB Output is correct
29 Correct 1 ms 284 KB Output is correct
30 Correct 0 ms 204 KB Output is correct
31 Correct 0 ms 204 KB Output is correct
32 Correct 0 ms 204 KB Output is correct
33 Correct 0 ms 204 KB Output is correct
34 Correct 1 ms 332 KB Output is correct
35 Correct 1 ms 332 KB Output is correct
36 Correct 1 ms 332 KB Output is correct
37 Correct 1 ms 332 KB Output is correct
38 Correct 1 ms 332 KB Output is correct
39 Correct 1 ms 332 KB Output is correct
40 Correct 1 ms 332 KB Output is correct
41 Correct 1 ms 332 KB Output is correct
42 Correct 1 ms 332 KB Output is correct
43 Correct 1 ms 332 KB Output is correct
44 Correct 1 ms 332 KB Output is correct
45 Correct 1 ms 332 KB Output is correct
46 Correct 1 ms 332 KB Output is correct
47 Correct 1 ms 332 KB Output is correct
48 Correct 1 ms 332 KB Output is correct
49 Correct 1 ms 332 KB Output is correct
50 Correct 1 ms 332 KB Output is correct
51 Correct 0 ms 332 KB Output is correct
52 Correct 1 ms 332 KB Output is correct

Subtask #4
65.0 / 65.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 0 ms 204 KB Output is correct
10 Correct 0 ms 204 KB Output is correct
11 Correct 0 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 0 ms 204 KB Output is correct
14 Correct 0 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 0 ms 204 KB Output is correct
17 Correct 1 ms 204 KB Output is correct
18 Correct 1 ms 204 KB Output is correct
19 Correct 0 ms 204 KB Output is correct
20 Correct 1 ms 204 KB Output is correct
21 Correct 1 ms 204 KB Output is correct
22 Correct 1 ms 204 KB Output is correct
23 Correct 0 ms 204 KB Output is correct
24 Correct 0 ms 204 KB Output is correct
25 Correct 0 ms 204 KB Output is correct
26 Correct 0 ms 204 KB Output is correct
27 Correct 0 ms 204 KB Output is correct
28 Correct 0 ms 204 KB Output is correct
29 Correct 1 ms 284 KB Output is correct
30 Correct 0 ms 204 KB Output is correct
31 Correct 0 ms 204 KB Output is correct
32 Correct 0 ms 204 KB Output is correct
33 Correct 0 ms 204 KB Output is correct
34 Correct 1 ms 332 KB Output is correct
35 Correct 1 ms 332 KB Output is correct
36 Correct 1 ms 332 KB Output is correct
37 Correct 1 ms 332 KB Output is correct
38 Correct 1 ms 332 KB Output is correct
39 Correct 1 ms 332 KB Output is correct
40 Correct 1 ms 332 KB Output is correct
41 Correct 1 ms 332 KB Output is correct
42 Correct 1 ms 332 KB Output is correct
43 Correct 1 ms 332 KB Output is correct
44 Correct 1 ms 332 KB Output is correct
45 Correct 1 ms 332 KB Output is correct
46 Correct 1 ms 332 KB Output is correct
47 Correct 1 ms 332 KB Output is correct
48 Correct 1 ms 332 KB Output is correct
49 Correct 1 ms 332 KB Output is correct
50 Correct 1 ms 332 KB Output is correct
51 Correct 0 ms 332 KB Output is correct
52 Correct 1 ms 332 KB Output is correct
53 Correct 41 ms 4564 KB Output is correct
54 Correct 39 ms 4756 KB Output is correct
55 Correct 35 ms 4756 KB Output is correct
56 Correct 35 ms 4692 KB Output is correct
57 Correct 29 ms 4856 KB Output is correct
58 Correct 26 ms 4688 KB Output is correct
59 Correct 28 ms 4612 KB Output is correct
60 Correct 32 ms 4732 KB Output is correct
61 Correct 27 ms 4820 KB Output is correct
62 Correct 28 ms 4824 KB Output is correct
63 Correct 29 ms 4812 KB Output is correct
64 Correct 23 ms 4488 KB Output is correct
65 Correct 28 ms 4656 KB Output is correct
66 Correct 31 ms 4524 KB Output is correct
67 Correct 30 ms 4548 KB Output is correct
68 Correct 29 ms 4260 KB Output is correct
69 Correct 28 ms 4816 KB Output is correct
70 Correct 25 ms 4376 KB Output is correct
71 Correct 22 ms 4728 KB Output is correct
72 Correct 21 ms 4752 KB Output is correct
73 Correct 28 ms 5028 KB Output is correct