oj.uz

Submission #492309

# Submission time Handle Problem Language Result Execution time Memory
492309 2021-12-06T15:07:51 Z alextodoran Monochrome Points (JOI20_monochrome) C++17
35 / 100
 2000 ms 224236 KB 
/**
 ____ ____ ____ ____ ____
||a |||t |||o |||d |||o ||
||__|||__|||__|||__|||__||
|/__\|/__\|/__\|/__\|/__\|

**/

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

int N;

string s;

vector <int> v[2];

map <pair <int, int>, int> Fen;

void update (int x, int y) {
    x++; y++;
    for (int i = x; i <= N * 2; i += i & -i) {
        for (int j = y; j <= N * 2; j += j & -j) {
            Fen[{i, j}]++;
        }
    }
}
int query (int x, int y) {
    x++; y++;
    int cnt = 0;
    for (int i = x; i >= 1; i -= i & -i) {
        for (int j = y; j >= 1; j -= j & -j) {
            cnt += Fen[{i, j}];
        }
    }
    return cnt;
}
int intersections (int x, int y) {
    return query(x, y) - query(x, x);
}

ll solve (int offs) {
    Fen.clear();
    vector <pair <int, int>> segments;
    for (int i = 0; i < N; i++) {
        int j = (i + offs) % N;
        segments.push_back(make_pair(v[0][i], v[1][j]));
        if (segments.back().first > segments.back().second) {
            swap(segments.back().first, segments.back().second);
        }
    }
    sort(segments.begin(), segments.end());
    ll cnt = 0;
    for (pair <int, int> p : segments) {
        cnt += intersections(p.first, p.second);
        update(p.first, p.second);
    }
    return cnt;
}

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

    cin >> N;
    cin >> s;

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

    int l = 0, r = N - 1;
    while (l < r) {
        int mid = (l + r) / 2;
        if (solve(mid) < solve(mid + 1)) {
            l = mid + 1;
        } else {
            r = mid;
        }
    }

    cout << solve(l) << "\n";

    return 0;
}

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 1 ms 204 KB Output is correct
6 Correct 1 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 1 ms 204 KB Output is correct
12 Correct 0 ms 204 KB Output is correct
13 Correct 1 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 1 ms 204 KB Output is correct
6 Correct 1 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 1 ms 204 KB Output is correct
12 Correct 0 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 38 ms 812 KB Output is correct
15 Correct 38 ms 716 KB Output is correct
16 Correct 41 ms 716 KB Output is correct
17 Correct 37 ms 716 KB Output is correct
18 Correct 31 ms 588 KB Output is correct
19 Correct 35 ms 720 KB Output is correct
20 Correct 35 ms 708 KB Output is correct
21 Correct 32 ms 712 KB Output is correct
22 Correct 37 ms 728 KB Output is correct
23 Correct 20 ms 588 KB Output is correct
24 Correct 32 ms 716 KB Output is correct
25 Correct 28 ms 768 KB Output is correct
26 Correct 33 ms 716 KB Output is correct
27 Correct 36 ms 716 KB Output is correct
28 Correct 35 ms 716 KB Output is correct
29 Correct 31 ms 696 KB Output is correct
30 Correct 31 ms 588 KB Output is correct
31 Correct 39 ms 744 KB Output is correct
32 Correct 38 ms 744 KB Output is correct
33 Correct 40 ms 892 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 1 ms 204 KB Output is correct
6 Correct 1 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 1 ms 204 KB Output is correct
12 Correct 0 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 38 ms 812 KB Output is correct
15 Correct 38 ms 716 KB Output is correct
16 Correct 41 ms 716 KB Output is correct
17 Correct 37 ms 716 KB Output is correct
18 Correct 31 ms 588 KB Output is correct
19 Correct 35 ms 720 KB Output is correct
20 Correct 35 ms 708 KB Output is correct
21 Correct 32 ms 712 KB Output is correct
22 Correct 37 ms 728 KB Output is correct
23 Correct 20 ms 588 KB Output is correct
24 Correct 32 ms 716 KB Output is correct
25 Correct 28 ms 768 KB Output is correct
26 Correct 33 ms 716 KB Output is correct
27 Correct 36 ms 716 KB Output is correct
28 Correct 35 ms 716 KB Output is correct
29 Correct 31 ms 696 KB Output is correct
30 Correct 31 ms 588 KB Output is correct
31 Correct 39 ms 744 KB Output is correct
32 Correct 38 ms 744 KB Output is correct
33 Correct 40 ms 892 KB Output is correct
34 Correct 540 ms 4936 KB Output is correct
35 Correct 545 ms 4940 KB Output is correct
36 Correct 548 ms 4888 KB Output is correct
37 Correct 535 ms 4668 KB Output is correct
38 Correct 467 ms 3832 KB Output is correct
39 Correct 513 ms 4036 KB Output is correct
40 Correct 456 ms 3816 KB Output is correct
41 Correct 456 ms 3824 KB Output is correct
42 Correct 531 ms 4804 KB Output is correct
43 Correct 535 ms 4652 KB Output is correct
44 Correct 503 ms 5188 KB Output is correct
45 Correct 497 ms 4100 KB Output is correct
46 Correct 531 ms 4248 KB Output is correct
47 Correct 533 ms 4248 KB Output is correct
48 Correct 510 ms 4164 KB Output is correct
49 Correct 425 ms 3776 KB Output is correct
50 Correct 523 ms 4192 KB Output is correct
51 Correct 526 ms 4160 KB Output is correct
52 Correct 520 ms 5620 KB Output is correct

Subtask #4
0.0 / 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 1 ms 204 KB Output is correct
6 Correct 1 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 1 ms 204 KB Output is correct
12 Correct 0 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 38 ms 812 KB Output is correct
15 Correct 38 ms 716 KB Output is correct
16 Correct 41 ms 716 KB Output is correct
17 Correct 37 ms 716 KB Output is correct
18 Correct 31 ms 588 KB Output is correct
19 Correct 35 ms 720 KB Output is correct
20 Correct 35 ms 708 KB Output is correct
21 Correct 32 ms 712 KB Output is correct
22 Correct 37 ms 728 KB Output is correct
23 Correct 20 ms 588 KB Output is correct
24 Correct 32 ms 716 KB Output is correct
25 Correct 28 ms 768 KB Output is correct
26 Correct 33 ms 716 KB Output is correct
27 Correct 36 ms 716 KB Output is correct
28 Correct 35 ms 716 KB Output is correct
29 Correct 31 ms 696 KB Output is correct
30 Correct 31 ms 588 KB Output is correct
31 Correct 39 ms 744 KB Output is correct
32 Correct 38 ms 744 KB Output is correct
33 Correct 40 ms 892 KB Output is correct
34 Correct 540 ms 4936 KB Output is correct
35 Correct 545 ms 4940 KB Output is correct
36 Correct 548 ms 4888 KB Output is correct
37 Correct 535 ms 4668 KB Output is correct
38 Correct 467 ms 3832 KB Output is correct
39 Correct 513 ms 4036 KB Output is correct
40 Correct 456 ms 3816 KB Output is correct
41 Correct 456 ms 3824 KB Output is correct
42 Correct 531 ms 4804 KB Output is correct
43 Correct 535 ms 4652 KB Output is correct
44 Correct 503 ms 5188 KB Output is correct
45 Correct 497 ms 4100 KB Output is correct
46 Correct 531 ms 4248 KB Output is correct
47 Correct 533 ms 4248 KB Output is correct
48 Correct 510 ms 4164 KB Output is correct
49 Correct 425 ms 3776 KB Output is correct
50 Correct 523 ms 4192 KB Output is correct
51 Correct 526 ms 4160 KB Output is correct
52 Correct 520 ms 5620 KB Output is correct
53 Execution timed out 2084 ms 224236 KB Time limit exceeded
54 Halted 0 ms 0 KB -