oj.uz

답안 #932854

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
932854 2024-02-24T10:13:07 Z alextodoran Chorus (JOI23_chorus) C++17
87 / 100
 7000 ms 48244 KB 
/**
 _  _   __  _ _ _  _  _ _
 |a  ||t  ||o    d | |o  |
| __    _| | _ | __|  _ |
| __ |/_  | __  /__\ / _\|

**/

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef long double ld;

const int N_MAX = 2000000;
const ll INF = LLONG_MAX;
const ld EPS = 1e-9;

int N, K;
int A[N_MAX + 2];
ll suff[N_MAX + 2];

ld dp[N_MAX + 2];
int cnt[N_MAX + 2];

struct Line {
    ld a, b;
    ld f (int x) {
        return a * x + b;
    }
};

Line lines[N_MAX + 2];
deque <int> rel;

bool check (const Line &l1, const Line &l2, const Line &l3) {
    return (l2.b - l1.b) * (l2.a - l3.a) < (l3.b - l2.b) * (l1.a - l2.a);
}

void add_line (int j) {
    while ((int) rel.size() >= 2
           && check(lines[rel.end()[-2]], lines[rel.back()], lines[j]) == false) {
        rel.pop_back();
    }
    rel.push_back(j);
}

pair <ld, int> query (int i) {
    if (rel.empty() == true) {
        return make_pair(INF, 0);
    }
    while ((int) rel.size() >= 2
           && make_pair(lines[rel[0]].f(i), cnt[rel[0]]) >=
              make_pair(lines[rel[1]].f(i), cnt[rel[1]])) {
        rel.pop_front();
    }
    return make_pair(lines[rel.front()].f(i) - suff[i + 1], cnt[rel.front()]);
}

ll solve (ld pen) {
    rel.clear();
    deque <int> dq;
    int curr = 0;
    for (int i = 1; i <= N; i++) {
        for (int j = curr; j < min(A[i] - i, i); j++) {
            // dp[j] + sum(A[i1] + i1 - j | i <= i1 <= i2)
            // dp[j] + suff[i] - suff[i2 + 1] - j * i2 + j * (i - 1)
            lines[j].a = -j;
            lines[j].b = dp[j] + suff[i] + (ll) j * (i - 1);
            add_line(j);
        }
        curr = min(A[i] - i, i);
        while (dq.empty() == false && dp[i - 1] < dp[dq.back()]) {
            dq.pop_back();
        }
        dq.push_back(i - 1);
        while (dq.empty() == false && dq.front() < curr) {
            dq.pop_front();
        }
        tie(dp[i], cnt[i]) = query(i);
        if (dq.empty() == false) {
            int j = dq.front();
            if (make_pair(dp[j], cnt[j]) < make_pair(dp[i], cnt[i])) {
                dp[i] = dp[j]; cnt[i] = cnt[j];
            }
        }
        dp[i] += pen; cnt[i]++;
    }
    rel.clear();
    return (ll) round(dp[N] - pen * K);
}

int main () {
//    ios_base::sync_with_stdio(false);
//    cin.tie(0);
    cout << fixed << setprecision(2);
    mt19937 rnd(time(0));

    cin >> N >> K;
//    N = 20; K = rnd() % N + 1;
    string S;
    cin >> S;
//    for (int i = 0; i < N * 2; i++) {
//        S += (i < N ? 'A' : 'B');
//    }
//    shuffle(S.begin(), S.end(), rnd);
//    cerr << N << " " << K << "\n";
//    cerr << S << "\n";
    for (int i = 0, j = 0; i < N * 2; i++) {
        if (S[i] == 'A') {
            A[++j] = i + 1;
        }
    }
    for (int i = N; i >= 1; i--) {
        suff[i] = suff[i + 1] + A[i] - i;
    }
    ld l = 0, r = LLONG_MAX; int iter = 300;
    while (iter--) {
        ld mid = (l + r) / 2;
        solve(mid);
        if (cnt[N] <= K) {
            r = mid;
        } else {
            l = mid + EPS;
        }
    }
    cout << solve(l) << "\n";

    return 0;
}

Subtask #1
16.0 / 16.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 1 ms 6492 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 1 ms 6492 KB Output is correct
9 Correct 1 ms 2396 KB Output is correct
10 Correct 1 ms 2392 KB Output is correct
11 Correct 1 ms 2392 KB Output is correct
12 Correct 1 ms 2396 KB Output is correct
13 Correct 1 ms 6604 KB Output is correct
14 Correct 1 ms 6492 KB Output is correct
15 Correct 1 ms 6492 KB Output is correct
16 Correct 1 ms 6492 KB Output is correct

Subtask #2
24.0 / 24.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 1 ms 6492 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 1 ms 6492 KB Output is correct
9 Correct 1 ms 2396 KB Output is correct
10 Correct 1 ms 2392 KB Output is correct
11 Correct 1 ms 2392 KB Output is correct
12 Correct 1 ms 2396 KB Output is correct
13 Correct 1 ms 6604 KB Output is correct
14 Correct 1 ms 6492 KB Output is correct
15 Correct 1 ms 6492 KB Output is correct
16 Correct 1 ms 6492 KB Output is correct
17 Correct 5 ms 6744 KB Output is correct
18 Correct 8 ms 6492 KB Output is correct
19 Correct 8 ms 6492 KB Output is correct
20 Correct 7 ms 2548 KB Output is correct
21 Correct 8 ms 2396 KB Output is correct
22 Correct 7 ms 2396 KB Output is correct
23 Correct 6 ms 2396 KB Output is correct
24 Correct 9 ms 6632 KB Output is correct
25 Correct 7 ms 6492 KB Output is correct
26 Correct 7 ms 6492 KB Output is correct
27 Correct 8 ms 6492 KB Output is correct
28 Correct 8 ms 6628 KB Output is correct

Subtask #3
21.0 / 21.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 1 ms 6492 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 1 ms 6492 KB Output is correct
9 Correct 1 ms 2396 KB Output is correct
10 Correct 1 ms 2392 KB Output is correct
11 Correct 1 ms 2392 KB Output is correct
12 Correct 1 ms 2396 KB Output is correct
13 Correct 1 ms 6604 KB Output is correct
14 Correct 1 ms 6492 KB Output is correct
15 Correct 1 ms 6492 KB Output is correct
16 Correct 1 ms 6492 KB Output is correct
17 Correct 5 ms 6744 KB Output is correct
18 Correct 8 ms 6492 KB Output is correct
19 Correct 8 ms 6492 KB Output is correct
20 Correct 7 ms 2548 KB Output is correct
21 Correct 8 ms 2396 KB Output is correct
22 Correct 7 ms 2396 KB Output is correct
23 Correct 6 ms 2396 KB Output is correct
24 Correct 9 ms 6632 KB Output is correct
25 Correct 7 ms 6492 KB Output is correct
26 Correct 7 ms 6492 KB Output is correct
27 Correct 8 ms 6492 KB Output is correct
28 Correct 8 ms 6628 KB Output is correct
29 Correct 74 ms 6744 KB Output is correct
30 Correct 79 ms 6744 KB Output is correct
31 Correct 80 ms 6748 KB Output is correct
32 Correct 63 ms 2816 KB Output is correct
33 Correct 75 ms 2808 KB Output is correct
34 Correct 77 ms 2652 KB Output is correct
35 Correct 56 ms 2648 KB Output is correct
36 Correct 108 ms 7000 KB Output is correct
37 Correct 100 ms 6748 KB Output is correct
38 Correct 64 ms 6744 KB Output is correct
39 Correct 79 ms 6800 KB Output is correct
40 Correct 71 ms 6804 KB Output is correct
41 Correct 88 ms 6744 KB Output is correct
42 Correct 44 ms 2652 KB Output is correct

Subtask #4
26.0 / 26.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 1 ms 6492 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 1 ms 6492 KB Output is correct
9 Correct 1 ms 2396 KB Output is correct
10 Correct 1 ms 2392 KB Output is correct
11 Correct 1 ms 2392 KB Output is correct
12 Correct 1 ms 2396 KB Output is correct
13 Correct 1 ms 6604 KB Output is correct
14 Correct 1 ms 6492 KB Output is correct
15 Correct 1 ms 6492 KB Output is correct
16 Correct 1 ms 6492 KB Output is correct
17 Correct 5 ms 6744 KB Output is correct
18 Correct 8 ms 6492 KB Output is correct
19 Correct 8 ms 6492 KB Output is correct
20 Correct 7 ms 2548 KB Output is correct
21 Correct 8 ms 2396 KB Output is correct
22 Correct 7 ms 2396 KB Output is correct
23 Correct 6 ms 2396 KB Output is correct
24 Correct 9 ms 6632 KB Output is correct
25 Correct 7 ms 6492 KB Output is correct
26 Correct 7 ms 6492 KB Output is correct
27 Correct 8 ms 6492 KB Output is correct
28 Correct 8 ms 6628 KB Output is correct
29 Correct 74 ms 6744 KB Output is correct
30 Correct 79 ms 6744 KB Output is correct
31 Correct 80 ms 6748 KB Output is correct
32 Correct 63 ms 2816 KB Output is correct
33 Correct 75 ms 2808 KB Output is correct
34 Correct 77 ms 2652 KB Output is correct
35 Correct 56 ms 2648 KB Output is correct
36 Correct 108 ms 7000 KB Output is correct
37 Correct 100 ms 6748 KB Output is correct
38 Correct 64 ms 6744 KB Output is correct
39 Correct 79 ms 6800 KB Output is correct
40 Correct 71 ms 6804 KB Output is correct
41 Correct 88 ms 6744 KB Output is correct
42 Correct 44 ms 2652 KB Output is correct
43 Correct 978 ms 6588 KB Output is correct
44 Correct 1623 ms 14024 KB Output is correct
45 Correct 1645 ms 13860 KB Output is correct
46 Correct 1241 ms 12008 KB Output is correct
47 Correct 1333 ms 11860 KB Output is correct
48 Correct 1268 ms 11868 KB Output is correct
49 Correct 1096 ms 12008 KB Output is correct
50 Correct 2208 ms 14024 KB Output is correct
51 Correct 2299 ms 14084 KB Output is correct
52 Correct 1243 ms 14056 KB Output is correct
53 Correct 1250 ms 14052 KB Output is correct
54 Correct 2245 ms 14276 KB Output is correct

Subtask #5
0 / 13.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 1 ms 6492 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 1 ms 6492 KB Output is correct
9 Correct 1 ms 2396 KB Output is correct
10 Correct 1 ms 2392 KB Output is correct
11 Correct 1 ms 2392 KB Output is correct
12 Correct 1 ms 2396 KB Output is correct
13 Correct 1 ms 6604 KB Output is correct
14 Correct 1 ms 6492 KB Output is correct
15 Correct 1 ms 6492 KB Output is correct
16 Correct 1 ms 6492 KB Output is correct
17 Correct 5 ms 6744 KB Output is correct
18 Correct 8 ms 6492 KB Output is correct
19 Correct 8 ms 6492 KB Output is correct
20 Correct 7 ms 2548 KB Output is correct
21 Correct 8 ms 2396 KB Output is correct
22 Correct 7 ms 2396 KB Output is correct
23 Correct 6 ms 2396 KB Output is correct
24 Correct 9 ms 6632 KB Output is correct
25 Correct 7 ms 6492 KB Output is correct
26 Correct 7 ms 6492 KB Output is correct
27 Correct 8 ms 6492 KB Output is correct
28 Correct 8 ms 6628 KB Output is correct
29 Correct 74 ms 6744 KB Output is correct
30 Correct 79 ms 6744 KB Output is correct
31 Correct 80 ms 6748 KB Output is correct
32 Correct 63 ms 2816 KB Output is correct
33 Correct 75 ms 2808 KB Output is correct
34 Correct 77 ms 2652 KB Output is correct
35 Correct 56 ms 2648 KB Output is correct
36 Correct 108 ms 7000 KB Output is correct
37 Correct 100 ms 6748 KB Output is correct
38 Correct 64 ms 6744 KB Output is correct
39 Correct 79 ms 6800 KB Output is correct
40 Correct 71 ms 6804 KB Output is correct
41 Correct 88 ms 6744 KB Output is correct
42 Correct 44 ms 2652 KB Output is correct
43 Correct 978 ms 6588 KB Output is correct
44 Correct 1623 ms 14024 KB Output is correct
45 Correct 1645 ms 13860 KB Output is correct
46 Correct 1241 ms 12008 KB Output is correct
47 Correct 1333 ms 11860 KB Output is correct
48 Correct 1268 ms 11868 KB Output is correct
49 Correct 1096 ms 12008 KB Output is correct
50 Correct 2208 ms 14024 KB Output is correct
51 Correct 2299 ms 14084 KB Output is correct
52 Correct 1243 ms 14056 KB Output is correct
53 Correct 1250 ms 14052 KB Output is correct
54 Correct 2245 ms 14276 KB Output is correct
55 Execution timed out 7026 ms 48244 KB Time limit exceeded
56 Halted 0 ms 0 KB -