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Submission #930491

# Submission time Handle Problem Language Result Execution time Memory
930491 2024-02-20T02:37:45 Z vjudge1 Feast (NOI19_feast) C++17
100 / 100
 91 ms 5212 KB 
#include <bits/stdc++.h>
#define int long long

using namespace std;

template<typename T>
inline bool maxi(T &x, const T &val)
{
    if (x < val) return x = val, true;
    return false;
}

template<typename T>
inline bool mini(T &x, const T &val)
{
    if (x > val) return x = val, true;
    return false;
}

const int maxn = 3e5 + 10, oo = 1e15;
int n, k;
int a[maxn], S[maxn];
int dp, cnt;

void trydp(int lam)
{
    dp = cnt = 0;
    for (int i = 1, cur = 0, curcnt = 0; i <= n; i++) {
        if (maxi(dp, cur + S[i] - lam)) cnt = curcnt + 1;
        if (maxi(cur, dp - S[i])) curcnt = cnt;
    }
}

void solve()
{
    cin >> n >> k;
    for (int i = 1; i <= n; i++) cin >> a[i], S[i] = S[i - 1] + a[i];
    int l = 0, r = oo;
    while (l < r) {
        int mid = (l + r) >> 1;
        trydp(mid);
        if (cnt > k) {
            l = mid + 1;
        }
        else {
            r = mid;
        }
    }
    trydp(r);
    cout << dp + cnt * r << '\n';
}

signed main()
{
#ifdef LOCAL
    clock_t st = clock();
#endif
    ios_base::sync_with_stdio(false);
    cin.tie(0);

#define Task ""
#ifdef LOCAL
    if (!fopen("D:\\.inp", "r")) {
        freopen("D:\\.inp", "w", stdout);
        freopen("D:\\.out", "w", stdout);
        cerr << "get input from file\n";
        return 0;
    }
    freopen("D:\\.inp", "r", stdin);
    freopen("D:\\.out", "w", stdout);
#else
    if (fopen(Task".inp", "r")) {
        freopen(Task".inp", "r", stdin);
        freopen(Task".out", "w", stdout);
    }
#endif

    solve();

#ifdef LOCAL
    cerr << clock() - st << endl;
#endif
}

Compilation message

feast.cpp: In function 'int main()':
feast.cpp:73:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   73 |         freopen(Task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
feast.cpp:74:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   74 |         freopen(Task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 35 ms 4956 KB Output is correct
2 Correct 36 ms 5012 KB Output is correct
3 Correct 37 ms 4956 KB Output is correct
4 Correct 36 ms 5132 KB Output is correct
5 Correct 46 ms 5004 KB Output is correct
6 Correct 40 ms 5204 KB Output is correct
7 Correct 35 ms 4952 KB Output is correct
8 Correct 38 ms 4956 KB Output is correct
9 Correct 35 ms 4952 KB Output is correct
10 Correct 35 ms 4956 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 28 ms 4956 KB Output is correct
2 Correct 28 ms 4956 KB Output is correct
3 Correct 32 ms 5004 KB Output is correct
4 Correct 28 ms 4952 KB Output is correct
5 Correct 35 ms 4956 KB Output is correct
6 Correct 28 ms 4956 KB Output is correct
7 Correct 29 ms 5212 KB Output is correct
8 Correct 36 ms 4948 KB Output is correct
9 Correct 36 ms 4948 KB Output is correct
10 Correct 29 ms 5004 KB Output is correct

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 56 ms 4948 KB Output is correct
2 Correct 56 ms 4956 KB Output is correct
3 Correct 58 ms 4944 KB Output is correct
4 Correct 55 ms 5008 KB Output is correct
5 Correct 56 ms 5096 KB Output is correct
6 Correct 59 ms 5000 KB Output is correct
7 Correct 60 ms 5128 KB Output is correct
8 Correct 54 ms 4952 KB Output is correct
9 Correct 55 ms 5004 KB Output is correct
10 Correct 56 ms 4952 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 0 ms 2396 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2396 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 1 ms 2392 KB Output is correct
9 Correct 1 ms 2396 KB Output is correct
10 Correct 1 ms 2396 KB Output is correct

Subtask #5
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 0 ms 2396 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2396 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 1 ms 2392 KB Output is correct
9 Correct 1 ms 2396 KB Output is correct
10 Correct 1 ms 2396 KB Output is correct
11 Correct 1 ms 2396 KB Output is correct
12 Correct 0 ms 2396 KB Output is correct
13 Correct 0 ms 2396 KB Output is correct
14 Correct 1 ms 2396 KB Output is correct
15 Correct 1 ms 2396 KB Output is correct
16 Correct 1 ms 2396 KB Output is correct
17 Correct 1 ms 2396 KB Output is correct
18 Correct 1 ms 2396 KB Output is correct
19 Correct 1 ms 2396 KB Output is correct
20 Correct 1 ms 2396 KB Output is correct

Subtask #6
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 0 ms 2396 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2396 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 1 ms 2392 KB Output is correct
9 Correct 1 ms 2396 KB Output is correct
10 Correct 1 ms 2396 KB Output is correct
11 Correct 1 ms 2396 KB Output is correct
12 Correct 0 ms 2396 KB Output is correct
13 Correct 0 ms 2396 KB Output is correct
14 Correct 1 ms 2396 KB Output is correct
15 Correct 1 ms 2396 KB Output is correct
16 Correct 1 ms 2396 KB Output is correct
17 Correct 1 ms 2396 KB Output is correct
18 Correct 1 ms 2396 KB Output is correct
19 Correct 1 ms 2396 KB Output is correct
20 Correct 1 ms 2396 KB Output is correct
21 Correct 1 ms 2392 KB Output is correct
22 Correct 1 ms 2396 KB Output is correct
23 Correct 1 ms 2396 KB Output is correct
24 Correct 1 ms 2396 KB Output is correct
25 Correct 1 ms 2396 KB Output is correct
26 Correct 1 ms 2392 KB Output is correct
27 Correct 1 ms 2396 KB Output is correct
28 Correct 1 ms 2396 KB Output is correct
29 Correct 1 ms 2396 KB Output is correct
30 Correct 2 ms 2396 KB Output is correct

Subtask #7
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 35 ms 4956 KB Output is correct
2 Correct 36 ms 5012 KB Output is correct
3 Correct 37 ms 4956 KB Output is correct
4 Correct 36 ms 5132 KB Output is correct
5 Correct 46 ms 5004 KB Output is correct
6 Correct 40 ms 5204 KB Output is correct
7 Correct 35 ms 4952 KB Output is correct
8 Correct 38 ms 4956 KB Output is correct
9 Correct 35 ms 4952 KB Output is correct
10 Correct 35 ms 4956 KB Output is correct
11 Correct 28 ms 4956 KB Output is correct
12 Correct 28 ms 4956 KB Output is correct
13 Correct 32 ms 5004 KB Output is correct
14 Correct 28 ms 4952 KB Output is correct
15 Correct 35 ms 4956 KB Output is correct
16 Correct 28 ms 4956 KB Output is correct
17 Correct 29 ms 5212 KB Output is correct
18 Correct 36 ms 4948 KB Output is correct
19 Correct 36 ms 4948 KB Output is correct
20 Correct 29 ms 5004 KB Output is correct
21 Correct 56 ms 4948 KB Output is correct
22 Correct 56 ms 4956 KB Output is correct
23 Correct 58 ms 4944 KB Output is correct
24 Correct 55 ms 5008 KB Output is correct
25 Correct 56 ms 5096 KB Output is correct
26 Correct 59 ms 5000 KB Output is correct
27 Correct 60 ms 5128 KB Output is correct
28 Correct 54 ms 4952 KB Output is correct
29 Correct 55 ms 5004 KB Output is correct
30 Correct 56 ms 4952 KB Output is correct
31 Correct 1 ms 2396 KB Output is correct
32 Correct 0 ms 2396 KB Output is correct
33 Correct 1 ms 2396 KB Output is correct
34 Correct 1 ms 2396 KB Output is correct
35 Correct 1 ms 2396 KB Output is correct
36 Correct 1 ms 2396 KB Output is correct
37 Correct 1 ms 2396 KB Output is correct
38 Correct 1 ms 2392 KB Output is correct
39 Correct 1 ms 2396 KB Output is correct
40 Correct 1 ms 2396 KB Output is correct
41 Correct 1 ms 2396 KB Output is correct
42 Correct 0 ms 2396 KB Output is correct
43 Correct 0 ms 2396 KB Output is correct
44 Correct 1 ms 2396 KB Output is correct
45 Correct 1 ms 2396 KB Output is correct
46 Correct 1 ms 2396 KB Output is correct
47 Correct 1 ms 2396 KB Output is correct
48 Correct 1 ms 2396 KB Output is correct
49 Correct 1 ms 2396 KB Output is correct
50 Correct 1 ms 2396 KB Output is correct
51 Correct 1 ms 2392 KB Output is correct
52 Correct 1 ms 2396 KB Output is correct
53 Correct 1 ms 2396 KB Output is correct
54 Correct 1 ms 2396 KB Output is correct
55 Correct 1 ms 2396 KB Output is correct
56 Correct 1 ms 2392 KB Output is correct
57 Correct 1 ms 2396 KB Output is correct
58 Correct 1 ms 2396 KB Output is correct
59 Correct 1 ms 2396 KB Output is correct
60 Correct 2 ms 2396 KB Output is correct
61 Correct 86 ms 4956 KB Output is correct
62 Correct 85 ms 4944 KB Output is correct
63 Correct 67 ms 4948 KB Output is correct
64 Correct 88 ms 5120 KB Output is correct
65 Correct 91 ms 5004 KB Output is correct
66 Correct 89 ms 5108 KB Output is correct
67 Correct 91 ms 5068 KB Output is correct
68 Correct 58 ms 5000 KB Output is correct
69 Correct 56 ms 5144 KB Output is correct
70 Correct 55 ms 5000 KB Output is correct