Submission #433521

#	Time	Username	Problem	Language	Result	Execution time	Memory
433521		kiennguyen246	Discharging (NOI20_discharging)	C++14	36 / 100	151 ms	13872 KiB

Discharging

/**
 * \author Nguyen Duc Kien
 * \date 20/06/2021
 */

///Task name
#define TASK ""

///-------------------------------------------///

#include <bits/stdc++.h>

using namespace std;

const int maxn = 1e6 + 5;

int n, a[maxn];

namespace Sub2
{
    long long f[2005];
    int mx[2005][2005];

    void Main()
    {
        for (int i = 1; i <= n; i ++)
            for (int j = 1; j <= n; j ++)
                mx[i][j] = (i != j ? - 1e9 - 69 : a[i]);
        for (int i = 1; i <= n; i ++)
            for (int j = i + 1; j <= n; j ++)
                mx[i][j] = max(mx[i][j - 1], a[j]);
        f[0] = 0;
        for (int i = 1; i <= n; i ++) f[i] = 1e18 + 69;
        for (int i = 1; i <= n; i ++)
        {
            for (int j = 0; j < i; j ++)
            {
                f[i] = min({f[i], f[j] + 1ll * mx[j + 1][i] * (n - j)});
            }
        }
        cout << f[n];
    }
}

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0), cout.tie(0);
    cerr << "Processing...\n\n";
    if (fopen(TASK".INP", "r"))
    {
        freopen(TASK".INP", "r", stdin);
//        freopen(TASK".OUT", "w", stdout);
    }

    cin >> n;
    for (int i = 1; i <= n; i ++) cin >> a[i];
    if (n <= 1500) Sub2::Main();

    cerr << "\n\n-----------------\n";
    return 0;
}

Compilation message (stderr)

Discharging.cpp: In function 'int main()':
Discharging.cpp:52:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   52 |         freopen(TASK".INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 13 / 13
• Subtask 3: 0 / 25
• Subtask 4: 0 / 11
• Subtask 5: 14 / 14
• Subtask 6: 0 / 28