oj.uz

Submission #861141

# Submission time Handle Problem Language Result Execution time Memory
861141 2023-10-15T12:43:13 Z sleepntsheep Feast (NOI19_feast) C++17
12 / 100
 28 ms 6272 KB 
#include <cstdio>
#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;
        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 dp[N]{0};
        memset(dp, -0xbf, sizeof dp);
        dp[0] = 0;
        for (int i = 1; i <= n; ++i) dp[i] = max({0ll, 1ll*a[i], dp[i-1] + a[i]});
        return cout <<*max_element(dp, dp+N), 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]);
                }
            } }
        cout << dp[n][k];
    }

    return 0;
}

Compilation message

feast.cpp: In function 'int main()':
feast.cpp:34:59: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
   34 |         if (k == 1) return cout << max({p[x-1], p[n] - p[x], p[n]}), 0;
      |                                                        ~~~^

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 23 ms 5980 KB Output is correct
2 Correct 23 ms 6272 KB Output is correct
3 Correct 25 ms 6236 KB Output is correct
4 Correct 24 ms 6236 KB Output is correct
5 Correct 23 ms 6236 KB Output is correct
6 Correct 23 ms 5980 KB Output is correct
7 Correct 23 ms 5980 KB Output is correct
8 Correct 24 ms 6228 KB Output is correct
9 Correct 24 ms 5980 KB Output is correct
10 Correct 25 ms 6120 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 6236 KB Output is correct
2 Correct 16 ms 6088 KB Output is correct
3 Correct 21 ms 6236 KB Output is correct
4 Correct 16 ms 6124 KB Output is correct
5 Correct 23 ms 5980 KB Output is correct
6 Correct 18 ms 6236 KB Output is correct
7 Correct 16 ms 6236 KB Output is correct
8 Correct 24 ms 6236 KB Output is correct
9 Correct 27 ms 5980 KB Output is correct
10 Correct 16 ms 6232 KB Output is correct

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Incorrect 28 ms 6236 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 2648 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 11.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 2648 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 2648 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 23 ms 5980 KB Output is correct
2 Correct 23 ms 6272 KB Output is correct
3 Correct 25 ms 6236 KB Output is correct
4 Correct 24 ms 6236 KB Output is correct
5 Correct 23 ms 6236 KB Output is correct
6 Correct 23 ms 5980 KB Output is correct
7 Correct 23 ms 5980 KB Output is correct
8 Correct 24 ms 6228 KB Output is correct
9 Correct 24 ms 5980 KB Output is correct
10 Correct 25 ms 6120 KB Output is correct
11 Correct 16 ms 6236 KB Output is correct
12 Correct 16 ms 6088 KB Output is correct
13 Correct 21 ms 6236 KB Output is correct
14 Correct 16 ms 6124 KB Output is correct
15 Correct 23 ms 5980 KB Output is correct
16 Correct 18 ms 6236 KB Output is correct
17 Correct 16 ms 6236 KB Output is correct
18 Correct 24 ms 6236 KB Output is correct
19 Correct 27 ms 5980 KB Output is correct
20 Correct 16 ms 6232 KB Output is correct
21 Incorrect 28 ms 6236 KB Output isn't correct
22 Halted 0 ms 0 KB -