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Submission #699114

# Submission time Handle Problem Language Result Execution time Memory
699114 2023-02-15T16:05:12 Z DennisTran Feast (NOI19_feast) C++17
53 / 100
 42 ms 61540 KB 
#pragma GCC optimize("O2")
#pragma GCC target("avx,avx2,fma")
#include <bits/stdc++.h>
#define FOR(i, a, b) for (int i = (a); i <= (b); i++)
#define FOD(i, a, b) for (int i = (a); i >= (b); i--)
#define REP(i, n) for (int i = 0; i < (n); i++)
#define ALL(x) (x).begin(), (x).end()
#define TIME  (1.0 * clock() / CLOCKS_PER_SEC)
#define file(name)  if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
using namespace std;

const int MAXN = 3e5 + 5;
const long long INF = 1e18 + 7;

int N, K, a[MAXN];

struct SUB1{
    long long dp[2005][2005][2];
    void solve(void) {
        FOR(i, 0, N) FOR(j, 0, K) dp[i][j][0] = dp[i][j][1] = -INF;
        dp[0][0][0] = 0;
        FOR(i, 0, N - 1) FOR(j, 0, K) if (dp[i][j][0] != -INF || dp[i][j][1] != INF) {
            dp[i + 1][j][0] = max(dp[i][j][0], dp[i][j][1]);
            dp[i + 1][j][1] = max(dp[i + 1][j][1], dp[i][j][1] + a[i + 1]);
            dp[i + 1][j + 1][1] = max(dp[i + 1][j + 1][1], dp[i][j][0] + a[i + 1]);
        }   
        long long ans = 0;
        FOR(i, N, N) FOR(j, 0, K) REP(c, 2) ans = max(ans, dp[i][j][c]);
        cout << ans; exit(0);
    }
} sub1;

struct SUB2{
    #define ii pair <int, int>
    #define fi first
    #define se second
    long long sum[MAXN];
    int M = 0, root[MAXN];
    ii b[MAXN];
    void solve(void) {
        FOR(i, 1, N) sum[i] = sum[i - 1] + a[i];

        FOR(i, 1, N) {
            if (a[i] < 0) continue;
            int l = i;
            while (l <= N && a[l] >= 0) l++;
            b[++M] = {i, l - 1};
            i = l - 1;
        }
        if (M <= K) {
            long long ans = 0;
            FOR(i, 1, M) ans += sum[b[i].se] - sum[b[i].fi - 1];
            cout << ans; exit(0);
        }
        long long ans = sum[N];
        FOR(i, 1, M) ans = max(ans, sum[b[i].se] - sum[b[i].fi - 1]);
        cout << ans;
    }
} sub2;

void solve(void) {
    cin >> N >> K;
    FOR(i, 1, N) cin >> a[i];
    if (N <= 2000) sub1.solve();
    sub2.solve();
}

signed main(void) {
    ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
    file("FEAST");
    //int T; cin >> T; while (T--) 
    solve();
    cerr << "Time elapsed: " << TIME << " s.\n";
    return (0 ^ 0);
}
/*
6 2 
1 2 3 -10 5 6
*/

Compilation message

feast.cpp: In function 'int main()':
feast.cpp:9:58: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 | #define file(name)  if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
      |                                                   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
feast.cpp:70:5: note: in expansion of macro 'file'
   70 |     file("FEAST");
      |     ^~~~
feast.cpp:9:91: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 | #define file(name)  if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
      |                                                                                    ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
feast.cpp:70:5: note: in expansion of macro 'file'
   70 |     file("FEAST");
      |     ^~~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 29 ms 6192 KB Output is correct
2 Correct 30 ms 6164 KB Output is correct
3 Correct 30 ms 6088 KB Output is correct
4 Correct 33 ms 6184 KB Output is correct
5 Correct 41 ms 6092 KB Output is correct
6 Correct 31 ms 6020 KB Output is correct
7 Correct 29 ms 6060 KB Output is correct
8 Correct 30 ms 6088 KB Output is correct
9 Correct 32 ms 6052 KB Output is correct
10 Correct 32 ms 6120 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 21 ms 6028 KB Output is correct
2 Correct 22 ms 6120 KB Output is correct
3 Correct 25 ms 6068 KB Output is correct
4 Correct 21 ms 7256 KB Output is correct
5 Correct 32 ms 8896 KB Output is correct
6 Correct 21 ms 7116 KB Output is correct
7 Correct 23 ms 7304 KB Output is correct
8 Correct 34 ms 9024 KB Output is correct
9 Correct 32 ms 8796 KB Output is correct
10 Correct 24 ms 7196 KB Output is correct

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Incorrect 35 ms 6128 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2900 KB Output is correct
2 Correct 2 ms 3028 KB Output is correct
3 Correct 2 ms 2900 KB Output is correct
4 Correct 2 ms 2900 KB Output is correct
5 Correct 2 ms 2940 KB Output is correct
6 Correct 2 ms 2900 KB Output is correct
7 Correct 1 ms 2900 KB Output is correct
8 Correct 2 ms 2900 KB Output is correct
9 Correct 2 ms 2900 KB Output is correct
10 Correct 1 ms 2900 KB Output is correct

Subtask #5
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2900 KB Output is correct
2 Correct 2 ms 3028 KB Output is correct
3 Correct 2 ms 2900 KB Output is correct
4 Correct 2 ms 2900 KB Output is correct
5 Correct 2 ms 2940 KB Output is correct
6 Correct 2 ms 2900 KB Output is correct
7 Correct 1 ms 2900 KB Output is correct
8 Correct 2 ms 2900 KB Output is correct
9 Correct 2 ms 2900 KB Output is correct
10 Correct 1 ms 2900 KB Output is correct
11 Correct 2 ms 4052 KB Output is correct
12 Correct 2 ms 3924 KB Output is correct
13 Correct 2 ms 3796 KB Output is correct
14 Correct 2 ms 3924 KB Output is correct
15 Correct 2 ms 3924 KB Output is correct
16 Correct 2 ms 3796 KB Output is correct
17 Correct 2 ms 4052 KB Output is correct
18 Correct 2 ms 3796 KB Output is correct
19 Correct 2 ms 3796 KB Output is correct
20 Correct 2 ms 3924 KB Output is correct

Subtask #6
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2900 KB Output is correct
2 Correct 2 ms 3028 KB Output is correct
3 Correct 2 ms 2900 KB Output is correct
4 Correct 2 ms 2900 KB Output is correct
5 Correct 2 ms 2940 KB Output is correct
6 Correct 2 ms 2900 KB Output is correct
7 Correct 1 ms 2900 KB Output is correct
8 Correct 2 ms 2900 KB Output is correct
9 Correct 2 ms 2900 KB Output is correct
10 Correct 1 ms 2900 KB Output is correct
11 Correct 2 ms 4052 KB Output is correct
12 Correct 2 ms 3924 KB Output is correct
13 Correct 2 ms 3796 KB Output is correct
14 Correct 2 ms 3924 KB Output is correct
15 Correct 2 ms 3924 KB Output is correct
16 Correct 2 ms 3796 KB Output is correct
17 Correct 2 ms 4052 KB Output is correct
18 Correct 2 ms 3796 KB Output is correct
19 Correct 2 ms 3796 KB Output is correct
20 Correct 2 ms 3924 KB Output is correct
21 Correct 13 ms 16724 KB Output is correct
22 Correct 42 ms 61540 KB Output is correct
23 Correct 14 ms 22356 KB Output is correct
24 Correct 11 ms 17108 KB Output is correct
25 Correct 11 ms 19924 KB Output is correct
26 Correct 10 ms 16128 KB Output is correct
27 Correct 9 ms 19412 KB Output is correct
28 Correct 5 ms 11732 KB Output is correct
29 Correct 5 ms 11564 KB Output is correct
30 Correct 4 ms 10580 KB Output is correct

Subtask #7
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 29 ms 6192 KB Output is correct
2 Correct 30 ms 6164 KB Output is correct
3 Correct 30 ms 6088 KB Output is correct
4 Correct 33 ms 6184 KB Output is correct
5 Correct 41 ms 6092 KB Output is correct
6 Correct 31 ms 6020 KB Output is correct
7 Correct 29 ms 6060 KB Output is correct
8 Correct 30 ms 6088 KB Output is correct
9 Correct 32 ms 6052 KB Output is correct
10 Correct 32 ms 6120 KB Output is correct
11 Correct 21 ms 6028 KB Output is correct
12 Correct 22 ms 6120 KB Output is correct
13 Correct 25 ms 6068 KB Output is correct
14 Correct 21 ms 7256 KB Output is correct
15 Correct 32 ms 8896 KB Output is correct
16 Correct 21 ms 7116 KB Output is correct
17 Correct 23 ms 7304 KB Output is correct
18 Correct 34 ms 9024 KB Output is correct
19 Correct 32 ms 8796 KB Output is correct
20 Correct 24 ms 7196 KB Output is correct
21 Incorrect 35 ms 6128 KB Output isn't correct
22 Halted 0 ms 0 KB -