oj.uz

Submission #708346

# Submission time Handle Problem Language Result Execution time Memory
708346 2023-03-11T15:36:01 Z Cyanmond Monochrome Points (JOI20_monochrome) C++17
100 / 100
 339 ms 9408 KB 
#include <bits/stdc++.h>

using i64 = long long;

int main() {
    int N;
    std::cin >> N;
    std::string S;
    std::cin >> S;
    std::vector<int> blackPos, whitePos;
    for (int i = 0; i < 2 * N; ++i) {
        if (S[i] == 'B') blackPos.push_back(i);
        if (S[i] == 'W') whitePos.push_back(i);
    }
    for (int i = 0; i < 3 * N; ++i) blackPos.push_back(blackPos[i] + 2 * N);
    for (int i = 0; i < 3 * N; ++i) whitePos.push_back(whitePos[i] + 2 * N);

    auto calc = [&](const int w) {
        // blackPos[i] - whitePos[i + w]
        for (int i = 0; i < N; ++i) {
            int a = blackPos[i], b = whitePos[i + w];
            while (b >= 2 * N) b -= 2 * N;
        }
        i64 cnt = 0;
        std::vector<int> ids;
        for (int i = 0; i < N; ++i) {
            if (blackPos[i] > whitePos[i + w]) {
                ids.push_back(i);
                std::swap(blackPos[i], whitePos[i + w]);
                std::swap(blackPos[i + N], whitePos[i + N + w]);
                std::swap(blackPos[i + 2 * N], whitePos[i + 2 * N + w]);
            }
        }
        int b = 0;
        for (int i = 0; i < N; ++i) {
            if (b == i) ++b;
            while (blackPos[b] < whitePos[i + w] and whitePos[b + w] < blackPos[i] + 2 * N) {
                ++b;
            }
            cnt += b - i - 1;
        }
        for (const int i : ids) {
            std::swap(blackPos[i], whitePos[i + w]);
            std::swap(blackPos[i + N], whitePos[i + N + w]);
            std::swap(blackPos[i + 2 * N], whitePos[i + 2 * N + w]);
        }
        return cnt;
    };

    int l = -1, r = N;
    while (r - l > 2) {
        int x1 = (2 * l + r) / 3, x2 = (l + 2 * r) / 3;
        const auto v1 = calc(x1), v2 = calc(x2);
        if (v1 > v2) r = x2;
        else l = x1;
    }
    std::cout << calc((l + r) / 2) << std::endl;
}

Compilation message

monochrome.cpp: In lambda function:
monochrome.cpp:21:17: warning: unused variable 'a' [-Wunused-variable]
   21 |             int a = blackPos[i], b = whitePos[i + w];
      |                 ^

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct

Subtask #2
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 1 ms 212 KB Output is correct
17 Correct 1 ms 212 KB Output is correct
18 Correct 1 ms 212 KB Output is correct
19 Correct 1 ms 212 KB Output is correct
20 Correct 1 ms 212 KB Output is correct
21 Correct 0 ms 212 KB Output is correct
22 Correct 1 ms 212 KB Output is correct
23 Correct 1 ms 212 KB Output is correct
24 Correct 1 ms 212 KB Output is correct
25 Correct 1 ms 212 KB Output is correct
26 Correct 0 ms 212 KB Output is correct
27 Correct 1 ms 212 KB Output is correct
28 Correct 1 ms 212 KB Output is correct
29 Correct 1 ms 212 KB Output is correct
30 Correct 1 ms 212 KB Output is correct
31 Correct 1 ms 212 KB Output is correct
32 Correct 1 ms 212 KB Output is correct
33 Correct 1 ms 212 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 1 ms 212 KB Output is correct
17 Correct 1 ms 212 KB Output is correct
18 Correct 1 ms 212 KB Output is correct
19 Correct 1 ms 212 KB Output is correct
20 Correct 1 ms 212 KB Output is correct
21 Correct 0 ms 212 KB Output is correct
22 Correct 1 ms 212 KB Output is correct
23 Correct 1 ms 212 KB Output is correct
24 Correct 1 ms 212 KB Output is correct
25 Correct 1 ms 212 KB Output is correct
26 Correct 0 ms 212 KB Output is correct
27 Correct 1 ms 212 KB Output is correct
28 Correct 1 ms 212 KB Output is correct
29 Correct 1 ms 212 KB Output is correct
30 Correct 1 ms 212 KB Output is correct
31 Correct 1 ms 212 KB Output is correct
32 Correct 1 ms 212 KB Output is correct
33 Correct 1 ms 212 KB Output is correct
34 Correct 2 ms 340 KB Output is correct
35 Correct 1 ms 340 KB Output is correct
36 Correct 1 ms 340 KB Output is correct
37 Correct 1 ms 340 KB Output is correct
38 Correct 1 ms 340 KB Output is correct
39 Correct 1 ms 340 KB Output is correct
40 Correct 1 ms 340 KB Output is correct
41 Correct 1 ms 340 KB Output is correct
42 Correct 1 ms 340 KB Output is correct
43 Correct 1 ms 340 KB Output is correct
44 Correct 1 ms 340 KB Output is correct
45 Correct 1 ms 340 KB Output is correct
46 Correct 1 ms 340 KB Output is correct
47 Correct 1 ms 340 KB Output is correct
48 Correct 1 ms 340 KB Output is correct
49 Correct 1 ms 340 KB Output is correct
50 Correct 1 ms 340 KB Output is correct
51 Correct 3 ms 340 KB Output is correct
52 Correct 1 ms 340 KB Output is correct

Subtask #4
65.0 / 65.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 1 ms 212 KB Output is correct
17 Correct 1 ms 212 KB Output is correct
18 Correct 1 ms 212 KB Output is correct
19 Correct 1 ms 212 KB Output is correct
20 Correct 1 ms 212 KB Output is correct
21 Correct 0 ms 212 KB Output is correct
22 Correct 1 ms 212 KB Output is correct
23 Correct 1 ms 212 KB Output is correct
24 Correct 1 ms 212 KB Output is correct
25 Correct 1 ms 212 KB Output is correct
26 Correct 0 ms 212 KB Output is correct
27 Correct 1 ms 212 KB Output is correct
28 Correct 1 ms 212 KB Output is correct
29 Correct 1 ms 212 KB Output is correct
30 Correct 1 ms 212 KB Output is correct
31 Correct 1 ms 212 KB Output is correct
32 Correct 1 ms 212 KB Output is correct
33 Correct 1 ms 212 KB Output is correct
34 Correct 2 ms 340 KB Output is correct
35 Correct 1 ms 340 KB Output is correct
36 Correct 1 ms 340 KB Output is correct
37 Correct 1 ms 340 KB Output is correct
38 Correct 1 ms 340 KB Output is correct
39 Correct 1 ms 340 KB Output is correct
40 Correct 1 ms 340 KB Output is correct
41 Correct 1 ms 340 KB Output is correct
42 Correct 1 ms 340 KB Output is correct
43 Correct 1 ms 340 KB Output is correct
44 Correct 1 ms 340 KB Output is correct
45 Correct 1 ms 340 KB Output is correct
46 Correct 1 ms 340 KB Output is correct
47 Correct 1 ms 340 KB Output is correct
48 Correct 1 ms 340 KB Output is correct
49 Correct 1 ms 340 KB Output is correct
50 Correct 1 ms 340 KB Output is correct
51 Correct 3 ms 340 KB Output is correct
52 Correct 1 ms 340 KB Output is correct
53 Correct 186 ms 9016 KB Output is correct
54 Correct 206 ms 9396 KB Output is correct
55 Correct 177 ms 9056 KB Output is correct
56 Correct 190 ms 9044 KB Output is correct
57 Correct 80 ms 9208 KB Output is correct
58 Correct 82 ms 9308 KB Output is correct
59 Correct 78 ms 9088 KB Output is correct
60 Correct 80 ms 9132 KB Output is correct
61 Correct 82 ms 9164 KB Output is correct
62 Correct 89 ms 9220 KB Output is correct
63 Correct 114 ms 9172 KB Output is correct
64 Correct 76 ms 9128 KB Output is correct
65 Correct 89 ms 8792 KB Output is correct
66 Correct 91 ms 9028 KB Output is correct
67 Correct 104 ms 9056 KB Output is correct
68 Correct 102 ms 8720 KB Output is correct
69 Correct 80 ms 9336 KB Output is correct
70 Correct 72 ms 8756 KB Output is correct
71 Correct 81 ms 9404 KB Output is correct
72 Correct 339 ms 9408 KB Output is correct
73 Correct 86 ms 9296 KB Output is correct