제출 #797398

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
797398		finn__	L-triominoes (CEOI21_ltriominoes)	C++17	28 / 100	8074 ms	255112 KiB

ltrominoes

#pragma GCC optimize("Ofast")
#pragma GCC target("avx,avx2,sse4")

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

constexpr size_t W = 13, K = 250;

struct bmatrix
{
    bitset<1 << W> mat[1 << W];

    bmatrix operator*(bmatrix const &y) const
    {
        bmatrix res;

        for (size_t i = 0; i < 1U << W; ++i)
            for (size_t j = 0; j < 1U << W; ++j)
                if (mat[i][j])
                    res.mat[i] |= y.mat[j];

        return res;
    }

    static bitset<1 << W> pow(bitset<1 << W> v, bmatrix pow2[31], size_t n)
    {
        size_t i = 1;

        while (n)
        {
            if (n & 1)
            {
                v = pow2[i].mul_vec(v);
            }
            n >>= 1;
            ++i;
        }

        return v;
    }

    bool operator==(bmatrix const &y) const
    {
        for (size_t i = 0; i < 1 << W; ++i)
            if (mat[i] != y.mat[i])
                return 0;
        return 1;
    }

    bitset<1 << W> mul_vec(bitset<1 << W> const &v) const
    {
        bitset<1 << W> res;
        for (size_t i = 0; i < 1U << W; ++i)
            res[i] = (mat[i] & v).any();
        return res;
    }
};

pair<size_t, size_t> p[K];
bmatrix transitions, pow2[31];
bitset<1 << W> state, state2;

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

    size_t w, h, k;
    cin >> w >> h >> k;

    for (size_t i = 0; i < k; ++i)
        cin >> p[i].first >> p[i].second, --p[i].first, --p[i].second;

    for (size_t y = 0; y < 1 << w; ++y)
    {
        queue<uint32_t> q;
        q.push(y << W);

        while (!q.empty())
        {
            uint32_t u = q.front();
            q.pop();

            size_t i = u >> W, j = u & ((1 << W) - 1);

            if (i == (1 << w) - 1)
            {
                transitions.mat[j][y] = 1;
                continue;
            }

            for (size_t h = 0; h < w; ++h)
                if (!(i & (1 << h)))
                {
                    if (h && !(j & (1 << h)) && !(j & (1 << (h - 1))))
                    {
                        size_t ni = i ^ (1 << h), nj = j ^ (1 << h) ^ (1 << (h - 1));
                        q.push((ni << W) | nj);
                    }
                    if (h + 1 < w && !(j & (1 << h)) && !(j & (1 << (h + 1))))
                    {
                        size_t ni = i ^ (1 << h), nj = j ^ (1 << h) ^ (1 << (h + 1));
                        q.push((ni << W) | nj);
                    }
                    if (h + 1 < w && !(i & (1 << (h + 1))) && !(j & (1 << h)))
                    {
                        size_t ni = i ^ (1 << h) ^ (1 << (h + 1)), nj = j ^ (1 << h);
                        q.push((ni << W) | nj);
                    }
                    if (h + 1 < w && !(i & (1 << (h + 1))) && !(j & (1 << (h + 1))))
                    {
                        size_t ni = i ^ (1 << h) ^ (1 << (h + 1)), nj = j ^ (1 << (h + 1));
                        q.push((ni << W) | nj);
                    }
                }
        }
    }

    pow2[1] = transitions;
    for (size_t i = 2; i < 31; ++i)
    {
        pow2[i] = pow2[i - 1] * pow2[i - 1];
        if (pow2[i] == pow2[i - 1])
        {
            for (size_t j = i + 1; j < 31; ++j)
                pow2[j] = pow2[i];
            break;
        }
    }

    sort(p, p + k, [](auto const &a, auto const &b)
         { return a.second < b.second; });
    size_t i = 0, pos = 0;
    if (k && !p[0].second)
    {
        size_t x = 0;
        while (!p[i].second)
            x |= 1 << p[i].first, ++i;
        state[x] = 1;
    }
    else
        state[0] = 1;

    while (i < k)
    {
        state = bmatrix::pow(state, pow2, p[i].second - pos);
        pos = p[i].second;
        size_t x = 0;
        size_t j = i;
        while (j < k && p[j].second == p[i].second)
            x |= 1 << p[j].first, ++j;
        i = j;

        state2.reset();
        for (size_t i = 0; i < 1 << w; ++i)
            if (!(i & x) && state[i])
                state2[i ^ x] = 1;
        state = state2;
    }

    if (pos != h - 1)
    {
        state = bmatrix::pow(state, pow2, h - 1 - pos);
    }

    cout << (state[(1 << w) - 1] ? "YES" : "NO") << '\n';
}

컴파일 시 표준 에러 (stderr) 메시지

ltrominoes.cpp: In function 'int main()':
ltrominoes.cpp:74:26: warning: comparison of integer expressions of different signedness: 'size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   74 |     for (size_t y = 0; y < 1 << w; ++y)
      |                        ~~^~~~~~~~
ltrominoes.cpp:86:19: warning: comparison of integer expressions of different signedness: 'size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   86 |             if (i == (1 << w) - 1)
      |                 ~~^~~~~~~~~~~~~~~
ltrominoes.cpp:155:30: warning: comparison of integer expressions of different signedness: 'size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  155 |         for (size_t i = 0; i < 1 << w; ++i)
      |                            ~~^~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 7
• Subtask 3: 11 / 11
• Subtask 4: 17 / 17
• Subtask 5: 0 / 35
• Subtask 6: 0 / 20