Submission #930358

#	Time	Username	Problem	Language	Result	Execution time	Memory
930358		vjudge1	Feast (NOI19_feast)	C++17	41 / 100	23 ms	32088 KiB

feast

#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 = 2010;
int n, k;
int a[maxn], S[maxn];
int dp[maxn][maxn];

void solve()
{
    cin >> n >> k;
    for (int i = 1; i <= n; i++) cin >> a[i], S[i] = S[i - 1] + a[i];
    for (int i = 1; i <= n; i++) {
        int cur = 0;
        for (int j = 1; j <= n; j++) {
            maxi(dp[i][j], dp[i][j - 1]);
            maxi(dp[i][j], dp[i - 1][j]);
            maxi(dp[i][j], cur + S[j]);
            maxi(cur, dp[i - 1][j] - S[j]);
        }
    }
    cout << dp[k][n] << '\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 (stderr)

feast.cpp: In function 'int main()':
feast.cpp:61:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   61 |         freopen(Task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
feast.cpp:62:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   62 |         freopen(Task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 4
• Subtask 2: 0 / 8
• Subtask 3: 0 / 18
• Subtask 4: 10 / 10
• Subtask 5: 11 / 11
• Subtask 6: 20 / 20
• Subtask 7: 0 / 29