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답안 #888155

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
888155 2023-12-16T08:47:35 Z Asamai Feast (NOI19_feast) C++17
100 / 100
 502 ms 5808 KB 
#include <bits/stdc++.h>

using namespace std;

template<class A, class B> bool maximize(A& x, B y) {if (x < y) return x = y, true; else return false;}
template<class A, class B> bool minimize(A& x, B y) {if (x > y) return x = y, true; else return false;}

#define     all(a)                a.begin(), a.end()
#define     pb                    push_back
#define     pf                    push_front
#define     fi                    first
#define     se                    second
#define     int                   long long

typedef     long long             ll;
typedef     long double           db;

const int MAX_N = 3e5 + 5;
const db inf = 3e14;
const db eps = 1e-3;

int n, k;
int a[MAX_N];
pair<db, int> dp[2][2];
bool curr, nxt;

int check(db lamda) {
    curr = 0, nxt = 1;
    for (int i = 0; i <= 1; i++) {
        for (int j = 0; j <= 1; j++) {
            dp[i][j] = {-inf, -inf};
        }
    }
    dp[curr][0] = {0, 0};
    for (int i = 0; i < n; i++, swap(curr, nxt)) {
        // 0
        maximize(dp[nxt][0], dp[curr][0]);
        maximize(dp[nxt][1], pair<db, int>(dp[curr][0].fi - lamda + (db) a[i + 1], dp[curr][0].se + 1));

        // 1
        maximize(dp[nxt][1], pair<db, int>(dp[curr][1].fi + (db) a[i + 1], dp[curr][1].se));
        maximize(dp[nxt][0], dp[curr][1]);

        for (int j = 0; j <= 1; j++) {
            dp[curr][j] = {-inf, -inf};
        }
    }
    return max(dp[curr][1], dp[curr][0]).se;
}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    if (fopen("FEAS.inp", "r")) {
        freopen("FEAS.inp", "r", stdin);
        freopen("FEAS.out", "w", stdout);
    }

    cin >> n >> k;
    for (int i = 1; i <= n; i++) {
        cin >> a[i];
    }

    db low = 0, high = inf;
    while (low + eps < high) {
        db mid = (low + high) / 2;
        if (check(mid) >= k) {
            low = mid;
        }
        else {
            high = mid;
        }
    }

    db ans = low;
    check(ans);
    cout << (ll) round(max(dp[curr][0], dp[curr][1]).fi + ans * k);

    return 0;
}

/*


Saturday, 16 December 2023
14:53:03
*/

Compilation message

feast.cpp: In function 'int main()':
feast.cpp:56:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   56 |         freopen("FEAS.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
feast.cpp:57:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   57 |         freopen("FEAS.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 398 ms 2712 KB Output is correct
2 Correct 431 ms 2760 KB Output is correct
3 Correct 410 ms 2788 KB Output is correct
4 Correct 414 ms 2896 KB Output is correct
5 Correct 412 ms 2652 KB Output is correct
6 Correct 406 ms 2716 KB Output is correct
7 Correct 404 ms 2648 KB Output is correct
8 Correct 412 ms 2764 KB Output is correct
9 Correct 413 ms 2724 KB Output is correct
10 Correct 403 ms 2652 KB Output is correct

Subtask #2
8.0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 379 ms 2736 KB Output is correct
2 Correct 381 ms 2788 KB Output is correct
3 Correct 378 ms 2724 KB Output is correct
4 Correct 391 ms 2652 KB Output is correct
5 Correct 383 ms 2900 KB Output is correct
6 Correct 373 ms 2648 KB Output is correct
7 Correct 402 ms 2780 KB Output is correct
8 Correct 387 ms 2772 KB Output is correct
9 Correct 390 ms 2944 KB Output is correct
10 Correct 393 ms 2768 KB Output is correct

Subtask #3
18.0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 420 ms 2756 KB Output is correct
2 Correct 420 ms 2728 KB Output is correct
3 Correct 417 ms 2648 KB Output is correct
4 Correct 419 ms 2728 KB Output is correct
5 Correct 418 ms 2752 KB Output is correct
6 Correct 420 ms 2900 KB Output is correct
7 Correct 420 ms 2776 KB Output is correct
8 Correct 414 ms 2752 KB Output is correct
9 Correct 421 ms 2652 KB Output is correct
10 Correct 419 ms 2648 KB Output is correct

Subtask #4
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 600 KB Output is correct
2 Correct 0 ms 600 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 344 KB Output is correct
8 Correct 0 ms 344 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct

Subtask #5
11.0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 600 KB Output is correct
2 Correct 0 ms 600 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 344 KB Output is correct
8 Correct 0 ms 344 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 1 ms 348 KB Output is correct
16 Correct 1 ms 348 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 1 ms 348 KB Output is correct
20 Correct 1 ms 348 KB Output is correct

Subtask #6
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 600 KB Output is correct
2 Correct 0 ms 600 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 344 KB Output is correct
8 Correct 0 ms 344 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 1 ms 348 KB Output is correct
16 Correct 1 ms 348 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 1 ms 348 KB Output is correct
20 Correct 1 ms 348 KB Output is correct
21 Correct 3 ms 348 KB Output is correct
22 Correct 3 ms 348 KB Output is correct
23 Correct 3 ms 468 KB Output is correct
24 Correct 3 ms 480 KB Output is correct
25 Correct 3 ms 348 KB Output is correct
26 Correct 3 ms 348 KB Output is correct
27 Correct 3 ms 348 KB Output is correct
28 Correct 3 ms 348 KB Output is correct
29 Correct 3 ms 348 KB Output is correct
30 Correct 3 ms 348 KB Output is correct

Subtask #7
29.0 / 29.0

# 결과 실행 시간 메모리 Grader output
1 Correct 398 ms 2712 KB Output is correct
2 Correct 431 ms 2760 KB Output is correct
3 Correct 410 ms 2788 KB Output is correct
4 Correct 414 ms 2896 KB Output is correct
5 Correct 412 ms 2652 KB Output is correct
6 Correct 406 ms 2716 KB Output is correct
7 Correct 404 ms 2648 KB Output is correct
8 Correct 412 ms 2764 KB Output is correct
9 Correct 413 ms 2724 KB Output is correct
10 Correct 403 ms 2652 KB Output is correct
11 Correct 379 ms 2736 KB Output is correct
12 Correct 381 ms 2788 KB Output is correct
13 Correct 378 ms 2724 KB Output is correct
14 Correct 391 ms 2652 KB Output is correct
15 Correct 383 ms 2900 KB Output is correct
16 Correct 373 ms 2648 KB Output is correct
17 Correct 402 ms 2780 KB Output is correct
18 Correct 387 ms 2772 KB Output is correct
19 Correct 390 ms 2944 KB Output is correct
20 Correct 393 ms 2768 KB Output is correct
21 Correct 420 ms 2756 KB Output is correct
22 Correct 420 ms 2728 KB Output is correct
23 Correct 417 ms 2648 KB Output is correct
24 Correct 419 ms 2728 KB Output is correct
25 Correct 418 ms 2752 KB Output is correct
26 Correct 420 ms 2900 KB Output is correct
27 Correct 420 ms 2776 KB Output is correct
28 Correct 414 ms 2752 KB Output is correct
29 Correct 421 ms 2652 KB Output is correct
30 Correct 419 ms 2648 KB Output is correct
31 Correct 0 ms 600 KB Output is correct
32 Correct 0 ms 600 KB Output is correct
33 Correct 0 ms 348 KB Output is correct
34 Correct 0 ms 348 KB Output is correct
35 Correct 1 ms 348 KB Output is correct
36 Correct 0 ms 348 KB Output is correct
37 Correct 0 ms 344 KB Output is correct
38 Correct 0 ms 344 KB Output is correct
39 Correct 0 ms 348 KB Output is correct
40 Correct 0 ms 348 KB Output is correct
41 Correct 1 ms 348 KB Output is correct
42 Correct 1 ms 348 KB Output is correct
43 Correct 1 ms 348 KB Output is correct
44 Correct 1 ms 348 KB Output is correct
45 Correct 1 ms 348 KB Output is correct
46 Correct 1 ms 348 KB Output is correct
47 Correct 1 ms 348 KB Output is correct
48 Correct 1 ms 348 KB Output is correct
49 Correct 1 ms 348 KB Output is correct
50 Correct 1 ms 348 KB Output is correct
51 Correct 3 ms 348 KB Output is correct
52 Correct 3 ms 348 KB Output is correct
53 Correct 3 ms 468 KB Output is correct
54 Correct 3 ms 480 KB Output is correct
55 Correct 3 ms 348 KB Output is correct
56 Correct 3 ms 348 KB Output is correct
57 Correct 3 ms 348 KB Output is correct
58 Correct 3 ms 348 KB Output is correct
59 Correct 3 ms 348 KB Output is correct
60 Correct 3 ms 348 KB Output is correct
61 Correct 488 ms 2728 KB Output is correct
62 Correct 481 ms 5608 KB Output is correct
63 Correct 445 ms 5696 KB Output is correct
64 Correct 501 ms 5720 KB Output is correct
65 Correct 502 ms 5724 KB Output is correct
66 Correct 494 ms 5804 KB Output is correct
67 Correct 486 ms 5460 KB Output is correct
68 Correct 426 ms 5808 KB Output is correct
69 Correct 429 ms 5712 KB Output is correct
70 Correct 440 ms 5676 KB Output is correct