oj.uz

Submission #782398

# Submission time Handle Problem Language Result Execution time Memory
782398 2023-07-13T23:13:41 Z tvladm2009 Monochrome Points (JOI20_monochrome) C++17
100 / 100
 930 ms 8104 KB 
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
const int N = (int) 2e5 + 7;
int n;
int aib[2 * N];
vector<int> v[2];
string s;

void update(int x) {
  x++;
  for (int i = x; i < 2 * N; i += i & -i) {
    aib[i]++;
  }
}

int query(int x) {
  x++;
  int ret = 0;
  for (int i = x; i >= 1; i -= i & -i) {
    ret += aib[i];
  }
  return ret;
}

int get(int l, int r) {
  return query(r) - query(l);
}

ll solve(int offset) {
  for (int i = 1; i <= 2 * n; i++) {
    aib[i] = 0;
  }
  vector<pair<int, int>> seg;
  for (int i = 0; i < n; i++) {
    int j = (i + offset) % n;
    seg.push_back({v[0][i], v[1][j]});
    if (seg.back().first > seg.back().second) {
      swap(seg.back().first, seg.back().second);
    }
  }
  sort(seg.begin(), seg.end());
  ll ret = 0;
  for (auto &it : seg) {
    ret += get(it.first, it.second);
    update(it.second);
  }
  return ret;
}

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

  ///freopen("input", "r", stdin);

  cin >> n >> s;
  for (int i = 0; i < 2 * n; i++) {
    v[(s[i] == 'B')].push_back(i);
  }

  int low = 0, high = n - 1, sol = 0;
  while (low < high) {
    int mid = (low + high) / 2;
    if (solve(mid) < solve(mid + 1)) {
      low = mid + 1;
    } else {
      high = mid;
    }
  }
  cout << solve(low) << "\n";
  return 0;
}

Compilation message

monochrome.cpp: In function 'int main()':
monochrome.cpp:63:30: warning: unused variable 'sol' [-Wunused-variable]
   63 |   int low = 0, high = n - 1, sol = 0;
      |                              ^~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 0 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 0 ms 340 KB Output is correct

Subtask #2
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 0 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 0 ms 340 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 ms 328 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 384 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 332 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 1 ms 340 KB Output is correct
29 Correct 1 ms 340 KB Output is correct
30 Correct 1 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 324 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 0 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 0 ms 340 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 ms 328 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 384 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 332 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 1 ms 340 KB Output is correct
29 Correct 1 ms 340 KB Output is correct
30 Correct 1 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 324 KB Output is correct
34 Correct 4 ms 428 KB Output is correct
35 Correct 4 ms 340 KB Output is correct
36 Correct 4 ms 340 KB Output is correct
37 Correct 4 ms 340 KB Output is correct
38 Correct 3 ms 340 KB Output is correct
39 Correct 4 ms 340 KB Output is correct
40 Correct 3 ms 340 KB Output is correct
41 Correct 3 ms 340 KB Output is correct
42 Correct 4 ms 340 KB Output is correct
43 Correct 4 ms 340 KB Output is correct
44 Correct 4 ms 340 KB Output is correct
45 Correct 4 ms 340 KB Output is correct
46 Correct 4 ms 340 KB Output is correct
47 Correct 3 ms 340 KB Output is correct
48 Correct 3 ms 340 KB Output is correct
49 Correct 3 ms 340 KB Output is correct
50 Correct 4 ms 340 KB Output is correct
51 Correct 3 ms 340 KB Output is correct
52 Correct 5 ms 340 KB Output is correct

Subtask #4
65.0 / 65.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 0 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 0 ms 340 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 ms 328 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 384 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 332 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 1 ms 340 KB Output is correct
29 Correct 1 ms 340 KB Output is correct
30 Correct 1 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 324 KB Output is correct
34 Correct 4 ms 428 KB Output is correct
35 Correct 4 ms 340 KB Output is correct
36 Correct 4 ms 340 KB Output is correct
37 Correct 4 ms 340 KB Output is correct
38 Correct 3 ms 340 KB Output is correct
39 Correct 4 ms 340 KB Output is correct
40 Correct 3 ms 340 KB Output is correct
41 Correct 3 ms 340 KB Output is correct
42 Correct 4 ms 340 KB Output is correct
43 Correct 4 ms 340 KB Output is correct
44 Correct 4 ms 340 KB Output is correct
45 Correct 4 ms 340 KB Output is correct
46 Correct 4 ms 340 KB Output is correct
47 Correct 3 ms 340 KB Output is correct
48 Correct 3 ms 340 KB Output is correct
49 Correct 3 ms 340 KB Output is correct
50 Correct 4 ms 340 KB Output is correct
51 Correct 3 ms 340 KB Output is correct
52 Correct 5 ms 340 KB Output is correct
53 Correct 820 ms 7908 KB Output is correct
54 Correct 808 ms 7884 KB Output is correct
55 Correct 842 ms 7736 KB Output is correct
56 Correct 768 ms 7728 KB Output is correct
57 Correct 708 ms 7776 KB Output is correct
58 Correct 630 ms 7932 KB Output is correct
59 Correct 680 ms 7652 KB Output is correct
60 Correct 758 ms 7680 KB Output is correct
61 Correct 836 ms 7812 KB Output is correct
62 Correct 747 ms 7772 KB Output is correct
63 Correct 842 ms 7848 KB Output is correct
64 Correct 638 ms 7828 KB Output is correct
65 Correct 771 ms 7568 KB Output is correct
66 Correct 757 ms 7604 KB Output is correct
67 Correct 792 ms 7656 KB Output is correct
68 Correct 579 ms 7528 KB Output is correct
69 Correct 650 ms 8104 KB Output is correct
70 Correct 626 ms 7408 KB Output is correct
71 Correct 871 ms 7892 KB Output is correct
72 Correct 513 ms 7880 KB Output is correct
73 Correct 930 ms 7952 KB Output is correct