Submission #808985

#	Time	Username	Problem	Language	Result	Execution time	Memory
808985		finn__	Tortoise (CEOI21_tortoise)	C++17	0 / 100	1 ms	980 KiB

tortoise

#include <bits/stdc++.h>
using namespace std;

constexpr size_t N = 300;

int32_t f[(N << 1) - 1][N], a[N], u[N], v[N];

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    size_t n, last_playground = -1;
    cin >> n;

    int32_t sum_a = 0;
    for (size_t i = 0; i < n; ++i)
    {
        cin >> a[i];
        if (a[i] >= 0)
            u[i] = last_playground, sum_a += a[i];
        else
            last_playground = i;
    }

    last_playground = n;
    for (size_t i = n - 1; i < n; --i)
    {
        if (a[i] >= 0)
            v[i] = last_playground;
        else
            last_playground = i;
    }

    for (size_t i = 0; i < (N << 1) - 1; ++i)
        fill(f[i], f[i] + N, INT32_MIN);
    for (size_t i = 0; i < n; ++i)
        f[i][i] = 0;

    int32_t ans = 0;
    for (int32_t i = 0; i < (n << 1) - 1; ++i)
        for (int32_t j = 0; j < n; ++j)
        {
            for (int32_t k = 0; k < n; ++k)
                if (i >= abs(j - k))
                    f[i][j] = max(f[i][j], f[i - abs(j - k)][k]);
            if (a[j] > 0)
            {
                if (i <= (j << 1) && u[j] != -1 && i + j - u[j] < (n << 1) - 1)
                {
                    f[i + j - u[j]][u[j]] = max(f[i + j - u[j]][u[j]], f[i][j] + 1);
                }
                if (i <= (j << 1) && v[j] != n && i + v[j] - j < (n << 1) - 1)
                {
                    f[i + v[j] - j][v[j]] = max(f[i + v[j] - j][v[j]], f[i][j] + 1);
                }
                ans = max(ans, f[i][j] + (i <= (j << 1)));
            }
        }

    cout << sum_a - ans << '\n';
}

Compilation message (stderr)

tortoise.cpp: In function 'int main()':
tortoise.cpp:41:27: warning: comparison of integer expressions of different signedness: 'int32_t' {aka 'int'} and 'size_t' {aka 'long unsigned int'} [-Wsign-compare]
   41 |     for (int32_t i = 0; i < (n << 1) - 1; ++i)
      |                         ~~^~~~~~~~~~~~~~
tortoise.cpp:42:31: warning: comparison of integer expressions of different signedness: 'int32_t' {aka 'int'} and 'size_t' {aka 'long unsigned int'} [-Wsign-compare]
   42 |         for (int32_t j = 0; j < n; ++j)
      |                             ~~^~~
tortoise.cpp:44:35: warning: comparison of integer expressions of different signedness: 'int32_t' {aka 'int'} and 'size_t' {aka 'long unsigned int'} [-Wsign-compare]
   44 |             for (int32_t k = 0; k < n; ++k)
      |                                 ~~^~~
tortoise.cpp:49:65: warning: comparison of integer expressions of different signedness: 'int32_t' {aka 'int'} and 'size_t' {aka 'long unsigned int'} [-Wsign-compare]
   49 |                 if (i <= (j << 1) && u[j] != -1 && i + j - u[j] < (n << 1) - 1)
      |                                                    ~~~~~~~~~~~~~^~~~~~~~~~~~~~
tortoise.cpp:53:43: warning: comparison of integer expressions of different signedness: 'int32_t' {aka 'int'} and 'size_t' {aka 'long unsigned int'} [-Wsign-compare]
   53 |                 if (i <= (j << 1) && v[j] != n && i + v[j] - j < (n << 1) - 1)
      |                                      ~~~~~^~~~
tortoise.cpp:53:64: warning: comparison of integer expressions of different signedness: 'int32_t' {aka 'int'} and 'size_t' {aka 'long unsigned int'} [-Wsign-compare]
   53 |                 if (i <= (j << 1) && v[j] != n && i + v[j] - j < (n << 1) - 1)
      |                                                   ~~~~~~~~~~~~~^~~~~~~~~~~~~~

• Subtask 1: 0 / 8
• Subtask 2: 0 / 10
• Subtask 3: 0 / 30
• Subtask 4: 0 / 25
• Subtask 5: 0 / 27