답안 #708346

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
708346	2023-03-11T15:36:01 Z	Cyanmond	Monochrome Points (JOI20_monochrome)	C++17	100 / 100	339 ms	9408 KB

monochrome

#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

#	결과	실행 시간	메모리	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

#	결과	실행 시간	메모리	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

#	결과	실행 시간	메모리	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

#	결과	실행 시간	메모리	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

답안 #708346

Compilation message

Subtask #1 4.0 / 4.0

Subtask #2 21.0 / 21.0

Subtask #3 10.0 / 10.0

Subtask #4 65.0 / 65.0

Subtask #1
4.0 / 4.0

Subtask #2
21.0 / 21.0

Subtask #3
10.0 / 10.0

Subtask #4
65.0 / 65.0