제출 #694126

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
694126		finn__	Uplifting Excursion (BOI22_vault)	C++17	0 / 100	7 ms	376 KiB

vault

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

int main()
{
    int64_t m, l;
    cin >> m >> l;

    vector<int64_t> a(2 * m + 1);
    for (int64_t &x : a)
        cin >> x;

    if (l < 0)
    {
        l = -l;
        for (int64_t i = 0; i < m; i++)
            swap(a[m - i - 1], a[m + i + 1]);
    }

    int64_t p = 0, total_added = 0;
    vector<int64_t> b(a.begin(), a.end());
    for (int64_t i = -m; i <= 0; i++)
        p += a[i + m] * i, b[i + m] = 0, total_added += a[i + m];
    for (int64_t i = 1; i <= m; i++)
    {
        for (int64_t j = 62; j >= 0; j--)
            if (1LL << j <= b[i + m] && p + (1LL << j) * i <= l)
            {
                p += (1LL << j) * i;
                b[i + m] -= 1LL << j;
                total_added += 1LL << j;
            }
    }

    if (p < l - m)
    {
        p = 0;
        total_added = 0;
        b = vector<int64_t>(a.begin(), a.end());
        for (int64_t i = 0; i <= m; i++)
            p += a[i + m] * i, b[i + m] = 0, total_added += a[i + m];
        for (int64_t i = -1; i >= -m; i--)
        {
            for (int64_t j = 62; j >= 0; j--)
                if (1LL << j <= b[i + m] && p + (1LL << j) * i >= l)
                {
                    p += (1LL << j) * i;
                    b[i + m] -= 1LL << j;
                    total_added += 1LL << j;
                }
        }

        if (p < l - m)
        {
            cout << "impossible\n";
            return 0;
        }
    }

    // l resides at m * m.
    vector<int64_t> dp1(2 * m * m + 1, 0), dp2(2 * m * m + 1, 0);
    dp1[m * m - (l - p)] = total_added;

    for (int64_t i = -m; i <= m; i++)
    {
        for (int64_t j = 0; j < dp1.size(); j++)
        {
            if (!dp1[j])
                continue;
            int64_t max_add = min<int64_t>(b[i + m], m),
                    max_remove = min<int64_t>(a[i + m] - b[i + m], m);

            for (int64_t k = 0;
                 1LL << k < max_add &&
                 0 <= j + (1LL << k) * i && j + (1LL << k) * i < dp1.size();
                 k++)
            {
                dp2[j + (1LL << k) * i] = max<int64_t>(dp2[j + (1LL << k) * i], dp1[j] + (1LL << k));
                max_add -= 1LL << k;
            }
            if (0 <= j + max_add * i && j + max_add * i < dp1.size())
                dp2[j + max_add * i] = max<int64_t>(dp2[j + max_add * i], dp1[j] + max_add);

            for (int64_t k = 0;
                 1LL << k < max_remove &&
                 0 <= j - (1LL << k) * i && j - (1LL << k) * i < dp1.size();
                 k++)
            {
                dp2[j - (1LL << k) * i] = max<int64_t>(dp2[j - (1LL << k) * i], dp1[j] - (1LL << k));
                max_remove -= 1LL << k;
            }
            if (0 <= j - max_remove * i && j - max_remove * i < dp1.size())
                dp2[j - max_remove * i] = max<int64_t>(dp2[j - max_remove * i], dp1[j] - max_remove);
        }

        swap(dp1, dp2);
        for (size_t i = 0; i < dp1.size(); i++)
            dp1[i] = max(dp1[i], dp2[i]), dp2[i] = max(dp1[i], dp2[i]);
    }

    if (!dp1[m * m])
        cout << "impossible\n";
    else
        cout << dp1[m * m] << '\n';
}

컴파일 시 표준 에러 (stderr) 메시지

vault.cpp: In function 'int main()':
vault.cpp:66:31: warning: comparison of integer expressions of different signedness: 'int64_t' {aka 'long int'} and 'std::vector<long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   66 |         for (int64_t j = 0; j < dp1.size(); j++)
      |                             ~~^~~~~~~~~~~~
vault.cpp:75:64: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   75 |                  0 <= j + (1LL << k) * i && j + (1LL << k) * i < dp1.size();
      |                                             ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
vault.cpp:81:57: warning: comparison of integer expressions of different signedness: 'int64_t' {aka 'long int'} and 'std::vector<long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   81 |             if (0 <= j + max_add * i && j + max_add * i < dp1.size())
      |                                         ~~~~~~~~~~~~~~~~^~~~~~~~~~~~
vault.cpp:86:64: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   86 |                  0 <= j - (1LL << k) * i && j - (1LL << k) * i < dp1.size();
      |                                             ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
vault.cpp:92:63: warning: comparison of integer expressions of different signedness: 'int64_t' {aka 'long int'} and 'std::vector<long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   92 |             if (0 <= j - max_remove * i && j - max_remove * i < dp1.size())
      |                                            ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 15
• Subtask 3-1: 0 / 10
• Subtask 3-2: 0 / 10
• Subtask 4-1: 0 / 10
• Subtask 4-2: 0 / 10
• Subtask 5-1: 0 / 10
• Subtask 5-2: 0 / 10
• Subtask 6-1: 0 / 10
• Subtask 6-2: 0 / 10