Submission #711258

#	Time	Username	Problem	Language	Result	Execution time	Memory
711258		pls33	Swimming competition (LMIO18_plaukimo_varzybos)	C++17	0 / 100	1 ms	340 KiB

plaukimo_varzybos

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

#pragma region dalykai
using p32 = pair<int, int>;
using p32u = pair<uint32_t, uint32_t>;
using p64 = pair<int64_t, int64_t>;
using p64u = pair<uint64_t, uint64_t>;
using vi16 = vector<int16_t>;
using vi16u = vector<uint16_t>;
using vi32 = vector<int>;
using vi32u = vector<uint32_t>;
using vi64 = vector<int64_t>;
using vi64u = vector<uint64_t>;
using vp32 = vector<p32>;
using vp32u = vector<p32u>;
using vp64 = vector<p64>;
using vp64u = vector<p64u>;
using vvi32 = vector<vi32>;
using vvi32u = vector<vi32u>;
using vvi64 = vector<vi64>;
using vvi64u = vector<vi64u>;
using vvp32 = vector<vp32>;
using vvp32u = vector<vp32u>;
using vvp64 = vector<vp64>;
using vvp64u = vector<vp64u>;

using pf32 = pair<float, float>;
using pf64 = pair<double, double>;
using pf80 = pair<long double, long double>;
using vf32 = vector<float>;
using vf64 = vector<double>;
using vf80 = vector<long double>;
using vpf32 = vector<pf32>;
using vpf64 = vector<pf64>;
using vpf80 = vector<pf80>;
using vvf32 = vector<vf32>;
using vvf64 = vector<vf64>;
using vvf80 = vector<vf80>;
using vvpf32 = vector<vpf32>;
using vvpf64 = vector<vpf64>;
using vvpf80 = vector<vpf80>;

template <typename key, typename val>
using ord_map = tree<key, val, less<key>, rb_tree_tag,
                     tree_order_statistics_node_update>;

template <typename key>
using ord_set = tree<key, null_type, less<key>, rb_tree_tag,
                     tree_order_statistics_node_update>;

const int BUF_SZ = 1 << 15;
inline namespace fast_in
{
    char buf[BUF_SZ];
    int pos;
    int len;

    char next_char(FILE *f)
    {
        if (pos == len)
        {
            pos = 0;
            len = (int)fread(buf, 1, BUF_SZ, f);

            if (!len)
            {
                return EOF;
            }
        }

        return buf[pos++];
    }

    int read_int(FILE *f)
    {
        int x;
        char ch;
        int sgn = 1;

        while (!isdigit(ch = next_char(f)))
        {
            if (ch == '-')
            {
                sgn *= -1;
            }
        }

        x = ch - '0';
        while (isdigit(ch = next_char(f)))
        {
            x = x * 10 + (ch - '0');
        }

        return x * sgn;
    }
}

/**
 * @brief gale programos flush_out kviest!!
 */
inline namespace fast_out
{
    char buf[BUF_SZ];
    int pos;

    void flush_out(FILE *f)
    {
        fwrite(buf, 1, pos, f);
        pos = 0;
    }

    void write_char(char c, FILE *f)
    {
        if (pos == BUF_SZ)
        {
            flush_out(f);
        }

        buf[pos++] = c;
    }

    void write_int(int x, FILE *f)
    {
        static char num_buf[100];

        if (x < 0)
        {
            write_char('-', f);
            x *= -1;
        }

        int len = 0;
        for (; x >= 10; x /= 10)
        {
            num_buf[len++] = (char)('0' + (x % 10));
        }

        write_char((char)('0' + x), f);
        while (len)
        {
            write_char(num_buf[--len], f);
        }
        write_char('\n', f);
    }
}
#pragma endregion

using change_t = vector<vector<pair<int, bool>>>;
void fix_multisets(int i,
                   change_t &insert, change_t &erase,
                   multiset<int> &opt, multiset<int> &diff)
{
    for (auto &[val, which] : insert[i])
    {
        if (which)
        {
            opt.insert(val);
        }
        else
        {
            diff.insert(val);
        }
    }
    for (auto &[val, which] : erase[i])
    {
        if (which)
        {
            auto it = opt.find(val);
            opt.erase(it);
        }
        else
        {
            auto it = diff.find(val);
            diff.erase(val);
        }
    }
}

int main()
{
#ifndef _AAAAAAAAA
    freopen("lmio_2018_3e2_plaukimo_varzybos_vyr.in", "r", stdin);
    freopen("lmio_2018_3e2_plaukimo_varzybos_vyr.out", "w", stdout);
    // ios_base::sync_with_stdio(false);
    // cin.tie(0);
#else
    freopen("swim.in", "r", stdin);
#ifndef __linux__
    atexit([]()
           {
        freopen("con", "r", stdin);
        system("pause"); });
#endif
#endif

    int n, l, u;
    cin >> n >> l >> u;

    vi32 nums(n);
    for (int i = 0; i < n; i++)
    {
        cin >> nums[i];
    }

    sort(nums.begin(), nums.end());

    vi32 dp(n, INT_MAX);
    vvp32 change(n + 1);

    // true jei is opt
    vector<vector<pair<int, bool>>> erase(n + 1), insert(n + 1);

    multiset<int> opt, diff;

    insert[min(n, l - 1)].emplace_back(nums[0], false);
    erase[min(n, u)].emplace_back(nums[0], false);
    fix_multisets(0, insert, erase, opt, diff);

    // kazkaip reikia pradzia (i = 0) sutvarkyt

    for (int i = 1; i < n; i++)
    {
        fix_multisets(i, insert, erase, opt, diff);

        if (opt.size())
        {
            dp[i] = min(dp[i], *opt.begin());
        }
        if (diff.size())
        {
            dp[i] = min(dp[i], nums[i] - *diff.rbegin());
        }

        if (i >= n - 1 || dp[i] == INT_MAX)
        {
            continue;
        }

        int bound = dp[i] + nums[i + 1];
        int lower = min(n, i + l) - 1;
        int upper = min(n, i + u) - 1;

        bound = (int)distance(nums.begin(), upper_bound(nums.begin(), nums.end(), bound));

        if (bound <= lower)
        {
            continue;
        }

        insert[lower + 1].emplace_back(dp[i], true);

        if (bound > upper)
        {
            erase[upper + 1].emplace_back(dp[i], true);
        }
        else
        {
            erase[bound].emplace_back(dp[i], true);
            insert[bound].emplace_back(nums[i + 1], false);
            erase[upper + 1].emplace_back(nums[i + 1], false);
        }

        /*for (int j = i - u + 1; j <= i - l + 1; j++)
        {
            if (j < 0)
            {
                continue;
            }

            int cur = j ? max(dp[j - 1], nums[i] - nums[j]) : nums[i] - nums[j];
            dp[i] = min(dp[i], cur);
        }
        */
    }

    cout << dp.back() << '\n';

    return 0;
}

Compilation message (stderr)

plaukimo_varzybos.cpp:8: warning: ignoring '#pragma region dalykai' [-Wunknown-pragmas]
    8 | #pragma region dalykai
      | 
plaukimo_varzybos.cpp:151: warning: ignoring '#pragma endregion ' [-Wunknown-pragmas]
  151 | #pragma endregion
      | 
plaukimo_varzybos.cpp: In function 'void fix_multisets(int, change_t&, change_t&, std::multiset<int>&, std::multiset<int>&)':
plaukimo_varzybos.cpp:178:18: warning: variable 'it' set but not used [-Wunused-but-set-variable]
  178 |             auto it = diff.find(val);
      |                  ^~
plaukimo_varzybos.cpp: In function 'int main()':
plaukimo_varzybos.cpp:187:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  187 |     freopen("lmio_2018_3e2_plaukimo_varzybos_vyr.in", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
plaukimo_varzybos.cpp:188:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  188 |     freopen("lmio_2018_3e2_plaukimo_varzybos_vyr.out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 20
• Subtask 3: 0 / 30
• Subtask 4: 0 / 40