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Submission #930481

# Submission time Handle Problem Language Result Execution time Memory
930481 2024-02-20T02:18:06 Z vjudge1 Feast (NOI19_feast) C++17
18 / 100
 66 ms 12884 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[maxn], cnt[maxn];

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

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[n] > k) {
            l = mid + 1;
        }
        else {
            r = mid;
        }
    }
    trydp(r);
    cout << dp[n] + cnt[n] * 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:76:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   76 |         freopen(Task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
feast.cpp:77:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   77 |         freopen(Task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 63 ms 12564 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 53 ms 10832 KB Output is correct
2 Correct 54 ms 10844 KB Output is correct
3 Correct 54 ms 10884 KB Output is correct
4 Incorrect 55 ms 10840 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 64 ms 12876 KB Output is correct
2 Correct 63 ms 12632 KB Output is correct
3 Correct 62 ms 12764 KB Output is correct
4 Correct 63 ms 12768 KB Output is correct
5 Correct 62 ms 12636 KB Output is correct
6 Correct 64 ms 12636 KB Output is correct
7 Correct 64 ms 12628 KB Output is correct
8 Correct 63 ms 12628 KB Output is correct
9 Correct 64 ms 12884 KB Output is correct
10 Correct 66 ms 12872 KB Output is correct

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 7000 KB Output is correct
2 Correct 6 ms 7260 KB Output is correct
3 Correct 6 ms 7004 KB Output is correct
4 Incorrect 5 ms 7000 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #5
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 7000 KB Output is correct
2 Correct 6 ms 7260 KB Output is correct
3 Correct 6 ms 7004 KB Output is correct
4 Incorrect 5 ms 7000 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 7000 KB Output is correct
2 Correct 6 ms 7260 KB Output is correct
3 Correct 6 ms 7004 KB Output is correct
4 Incorrect 5 ms 7000 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #7
0 / 29.0

# Verdict Execution time Memory Grader output
1 Incorrect 63 ms 12564 KB Output isn't correct
2 Halted 0 ms 0 KB -