oj.uz

Submission #861164

# Submission time Handle Problem Language Result Execution time Memory
861164 2023-10-15T14:05:39 Z sleepntsheep Feast (NOI19_feast) C++17
30 / 100
 1000 ms 3932 KB 
#include <cstdio>
#include <climits>
#include <functional>
#include <numeric>
#include <cstring>
#include <cassert>
#include <string>
#include <deque>
#include <vector>
#include <map>
#include <queue>
#include <algorithm>
#include <iostream>
#include <utility>
using namespace std;
using ll=long long;

#define N 300005
#define ALL(x) x.begin(), x.end()

int n, k, a[N];
long long p[N];

int main()
{
    cin.tie(0)->sync_with_stdio(0);
    cin >> n >> k;
    for (int i = 1; i <= n; ++i) cin >> a[i], p[i] = p[i-1] + a[i];

    if (count_if(a+1, a+1+n,[](int x){ return x<0; }) == 0) return cout << accumulate(a+1,a+1+n, 0ll), 0;

    if (count_if(a+1, a+1+n,[](int x){ return x<0; }) == 1)
    {
        int x=0;
        for (int i = 1; i <= n; ++i) if (a[i] < 0) x = i;
        if (k == 1) return cout << max({p[x-1], p[n] - p[x], p[n]}), 0;
        else return cout << p[n] - a[x], 0;
    }

    if (k == 1)
    {
        long long ans = 0, mn = 0;
        for (int i = 1; i <= n; ++i) ans = max(ans, p[i] - mn), mn = min(mn, p[i]);
        return cout << ans, 0;
    }

    if (n <= 3000)
    {
        vector<vector<vector<long long>>> dp(2, vector<vector<long long>>(3005, vector<long long>(2)));
        long long ans = 0;
        for (int i = 1; i <= n; ++i)
        {
            for (int j = 1; j <= k; ++i)
            {
                ans = max({ans, dp[i&1][j][0], dp[i&1][j][1]});
            }
        }
        return cout << ans, 0;
    }

    if (n <= 300)
    {
        long long dp[305][305]{0};
        for (int i = 1; i <= n; ++i)
            for (int j = 1; j <= k; ++j)
            {
                dp[i][j] = max({dp[i-1][j], dp[i][j], dp[i][j-1]});
                for (int l = 0; l < i; ++l) dp[i][j] = max(dp[i][j], dp[l][j-1] + p[i] - p[l]);
            }
        return cout << dp[n][k], 0;
    }

    assert(0);
#if 0
    {
        function<void(int, int, int, int, int)> compute = [&](int i, int l, int r, int optl, int optr)
        {
            if (l > r) return;
            int m = (l+r)/2;
            pair<long long, int> best = {LLONG_MIN, -1};
            for (int k = optl; k <= min(m, optr); ++k)
                best = max(best, {(dp[!(i&1)][k]) + p[m] - p[k], k});
            dp[i&1][m] = best.first;
            compute(i, l, m-1, optl, best.second), compute(i, m+1, r, best.second, optr);
        };

        long long ans = 0;
        for (int i = 1; i <= k; ++i)
        {
            compute(i, 1, n, 0, n-1);
            for (int i = 1; i <= n; ++i) dp[i&1][i] = max(dp[i&1][i], dp[i&1][i-1]);
            ans = max(ans, *max_element(dp[i&1], dp[i&1]+n+1));
        }
        return cout << ans,0;
    }
#endif

    return 0;
}

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 22 ms 3840 KB Output is correct
2 Correct 22 ms 3928 KB Output is correct
3 Correct 23 ms 3928 KB Output is correct
4 Correct 23 ms 3928 KB Output is correct
5 Correct 22 ms 3932 KB Output is correct
6 Correct 22 ms 3676 KB Output is correct
7 Correct 23 ms 3676 KB Output is correct
8 Correct 23 ms 3924 KB Output is correct
9 Correct 22 ms 3924 KB Output is correct
10 Correct 29 ms 3676 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 3700 KB Output is correct
2 Correct 15 ms 3896 KB Output is correct
3 Correct 15 ms 3840 KB Output is correct
4 Correct 15 ms 3676 KB Output is correct
5 Correct 22 ms 3852 KB Output is correct
6 Correct 14 ms 3676 KB Output is correct
7 Correct 15 ms 3728 KB Output is correct
8 Correct 23 ms 3800 KB Output is correct
9 Correct 25 ms 3676 KB Output is correct
10 Correct 16 ms 3928 KB Output is correct

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 25 ms 3932 KB Output is correct
2 Correct 25 ms 3884 KB Output is correct
3 Correct 25 ms 3932 KB Output is correct
4 Correct 25 ms 3676 KB Output is correct
5 Correct 24 ms 3796 KB Output is correct
6 Correct 24 ms 3924 KB Output is correct
7 Correct 25 ms 3932 KB Output is correct
8 Correct 25 ms 3932 KB Output is correct
9 Correct 25 ms 3932 KB Output is correct
10 Correct 25 ms 3932 KB Output is correct

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Execution timed out 1037 ms 856 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #5
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Execution timed out 1037 ms 856 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Execution timed out 1037 ms 856 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #7
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 22 ms 3840 KB Output is correct
2 Correct 22 ms 3928 KB Output is correct
3 Correct 23 ms 3928 KB Output is correct
4 Correct 23 ms 3928 KB Output is correct
5 Correct 22 ms 3932 KB Output is correct
6 Correct 22 ms 3676 KB Output is correct
7 Correct 23 ms 3676 KB Output is correct
8 Correct 23 ms 3924 KB Output is correct
9 Correct 22 ms 3924 KB Output is correct
10 Correct 29 ms 3676 KB Output is correct
11 Correct 15 ms 3700 KB Output is correct
12 Correct 15 ms 3896 KB Output is correct
13 Correct 15 ms 3840 KB Output is correct
14 Correct 15 ms 3676 KB Output is correct
15 Correct 22 ms 3852 KB Output is correct
16 Correct 14 ms 3676 KB Output is correct
17 Correct 15 ms 3728 KB Output is correct
18 Correct 23 ms 3800 KB Output is correct
19 Correct 25 ms 3676 KB Output is correct
20 Correct 16 ms 3928 KB Output is correct
21 Correct 25 ms 3932 KB Output is correct
22 Correct 25 ms 3884 KB Output is correct
23 Correct 25 ms 3932 KB Output is correct
24 Correct 25 ms 3676 KB Output is correct
25 Correct 24 ms 3796 KB Output is correct
26 Correct 24 ms 3924 KB Output is correct
27 Correct 25 ms 3932 KB Output is correct
28 Correct 25 ms 3932 KB Output is correct
29 Correct 25 ms 3932 KB Output is correct
30 Correct 25 ms 3932 KB Output is correct
31 Correct 0 ms 344 KB Output is correct
32 Execution timed out 1037 ms 856 KB Time limit exceeded
33 Halted 0 ms 0 KB -