oj.uz

Submission #780295

# Submission time Handle Problem Language Result Execution time Memory
780295 2023-07-12T08:01:42 Z boris_mihov Maze (JOI23_ho_t3) C++17
0 / 100
 625 ms 1138160 KB 
#include <algorithm>
#include <iostream>
#include <numeric>
#include <cassert>
#include <vector>
#include <queue>

typedef long long llong;
const int MAXLOG = 23;
const int MAXN = 6000000 + 10;
const int INF  = 1e9;

struct BIT
{
    std::vector <int> tree;
    void build(int sz)
    {
        tree.resize(sz + 1, 0);
    }

    void update(int pos, int value)
    {
        assert(pos >= 1 && pos < tree.size());
        for (int idx = pos ; idx < tree.size() ; idx += idx & (-idx))
        {
            tree[idx] += value;
        }
    }

    int query(int pos)
    {
        assert(pos >= 0 && pos < tree.size());
        int res = 0;
        for (int idx = pos ; idx > 0 ; idx -= idx & (-idx))
        {
            res += tree[idx];
        }

        return pos - res;
    }

    int findKth(int k)
    {
        int k2 = k;
        int idx = 0;
        for (int log = MAXLOG - 1 ; log >= 0 ; --log)
        {
            if (idx + (1 << log) < tree.size() && (1 << log) - tree[idx + (1 << log)] < k)
            {
                idx += (1 << log);
                k -= (1 << log) - tree[idx];
            }
        }

        int l = 0, r = tree.size(), mid;
        while (l < r - 1)
        {
            mid = (l + r) / 2;
            if (query(mid) < k2) l = mid;
            else r = mid;
        }

        // if (l != idx)
        // {
        //     std::cout << "bad: " << l << ' ' << idx << '\n' << std::flush;
        // }
        // assert(l == idx);
        return r;
    }
};

int r, c, n;
int sRow, sCol;
int eRow, eCol;
BIT byROW[MAXN];
BIT byCOL[MAXN];
std::pair <int,int> delta[] = {{-1, 0}, {0, -1}, {1, 0}, {0, 1}};
std::deque <std::pair <int,int>> dq;
std::vector <int> dist[MAXN];
std::string t[MAXN];

bool isOutside(int row, int col)
{
    return row == 0 || row == r + 1 || col == 0 || col == c + 1;
}

void setCELL(int row, int col)
{
    byROW[row].update(col, 1); 
    byCOL[col].update(row, 1); 
}

void addROW(int row, int colL, int colR, int currDist)
{
    int curr = byROW[row].query(colL - 1);
    // while (true)
    // {
    //     int search = byROW[row].findKth(curr + 1);
    //     if (search > colR)
    //     {
    //         break;
    //     }

    //     if (dist[row][search] > currDist + 1) dist[row][search] = currDist + 1;
    //     dq.push_back({row, search});
    //     setCELL(row, search);
    // }

    for (int i = colL ; i <= colR ; ++i)
    {
        if (dist[row][i] == INF)
        {
            if (byROW[row].findKth(curr + 1) != i)
            {
                assert(false);
                int res = byROW[row].findKth(curr + 1); assert(res != i);
                // // assert(byROW[row].query(res) - byROW[row].query(res - 1) == 1);
                // bool was = (res > i);
                while (res < i){}
                while (res > i){}
                // assert(res != i && (res > i) == was);
                // // while (true) assert((res > i) == was);
            }

            setCELL(row, i);
            dist[row][i] = currDist + 1;
            dq.push_back({row, i});
        }
    }
}

void addCOL(int col, int rowL, int rowR, int currDist)
{
    int curr = byCOL[col].query(rowL - 1);
    // while (true)
    // {
    //     int search = byCOL[col].findKth(curr + 1);
    //     if (search > rowR)
    //     {
    //         break;
    //     }

    //     if (dist[search][col] > currDist + 1) dist[search][col] = currDist + 1;
    //     dq.push_back({search, col});
    //     setCELL(search, col);
    // }

    for (int i = rowL ; i <= rowR ; ++i)
    {
        if (dist[i][col] == INF)
        {
            if (byCOL[col].findKth(curr + 1) != i)
            {
                // assert(false);
                int res = byCOL[col].findKth(curr + 1); assert(res != i);
                // // assert(byCOL[col].query(res) - byCOL[col].query(res - 1) == 1);
                // bool was = (res > i);
                while (res < i){}
                while (res > i){}
                // assert(res != i && (res > i) == was);
                // // while (true) assert((res > i) == was);
            }

            setCELL(i, col);
            dist[i][col] = currDist + 1;
            dq.push_back({i, col});
        }
    }
}

void solve()
{
    for (int i = 1 ; i <= r ; ++i)
    {
        std::fill(dist[i].begin(), dist[i].end(), INF);
    }

    for (int i = 1 ; i <= r ; ++i)
    {
        byROW[i].build(c);
    }
    
    for (int i = 1 ; i <= c ; ++i)
    {
        byCOL[i].build(r);
    }
    
    dq.push_back({sRow, sCol});
    dist[sRow][sCol] = 0;
    setCELL(sRow, sCol);

    while (!dq.empty())
    {
        auto [row, col] = dq.front();
        dq.pop_front();    

        if (row == eRow && col == eCol)
        {
            std::cout << dist[row][col] << '\n';
            break;
        }

        for (const auto &[dx, dy] : delta)
        {
            if (isOutside(row + dx, col + dy) || dist[row + dx][col + dy] <= dist[row][col])
            {
                continue;
            }

            if (t[row + dx][col + dy] == '.')
            {
                setCELL(row + dx, col + dy);
                dist[row + dx][col + dy] = dist[row][col]; 
                dq.push_front({row + dx, col + dy});
            }
        }

        if (abs(row - eRow) <= n && abs(col - eCol) <= n && dist[eRow][eCol] > dist[row][col])
        {
            setCELL(eRow, eCol);
            dist[eRow][eCol] = dist[row][col] + 1;
            dq.push_back({eRow, eCol});
        }

        addROW(std::max(1, row - n), std::max(1, col - n + 1), std::min(c, col + n - 1), dist[row][col]);
        addROW(std::min(r, row + n), std::max(1, col - n + 1), std::min(c, col + n - 1), dist[row][col]);
        addCOL(std::max(1, col - n), std::max(1, row - n + 1), std::min(r, row + n - 1), dist[row][col]);
        addCOL(std::min(c, col + n), std::max(1, row - n + 1), std::min(r, row + n - 1), dist[row][col]);
    }
}

void input()
{
    std::cin >> r >> c >> n;
    std::cin >> sRow >> sCol;
    std::cin >> eRow >> eCol;
    for (int i = 1 ; i <= r ; ++i)
    {
        std::cin >> t[i];
        t[i] = ' ' + t[i];
        dist[i].resize(c + 1, INF);
    }
}

void fastIOI()
{
    std::ios_base :: sync_with_stdio(0);
    std::cout.tie(nullptr);
    std::cin.tie(nullptr);
}

int main()
{
    fastIOI();
    input();
    solve();

    return 0;
}

Compilation message

In file included from /usr/include/c++/10/cassert:44,
                 from Main.cpp:4:
Main.cpp: In member function 'void BIT::update(int, int)':
Main.cpp:23:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |         assert(pos >= 1 && pos < tree.size());
      |                            ~~~~^~~~~~~~~~~~~
Main.cpp:24:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |         for (int idx = pos ; idx < tree.size() ; idx += idx & (-idx))
      |                              ~~~~^~~~~~~~~~~~~
In file included from /usr/include/c++/10/cassert:44,
                 from Main.cpp:4:
Main.cpp: In member function 'int BIT::query(int)':
Main.cpp:32:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |         assert(pos >= 0 && pos < tree.size());
      |                            ~~~~^~~~~~~~~~~~~
Main.cpp: In member function 'int BIT::findKth(int)':
Main.cpp:48:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   48 |             if (idx + (1 << log) < tree.size() && (1 << log) - tree[idx + (1 << log)] < k)
      |                 ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~

Subtask #1
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 269 ms 610864 KB Output is correct
2 Correct 255 ms 610876 KB Output is correct
3 Correct 250 ms 610776 KB Output is correct
4 Correct 253 ms 610892 KB Output is correct
5 Correct 417 ms 610816 KB Output is correct
6 Correct 254 ms 610884 KB Output is correct
7 Correct 253 ms 610908 KB Output is correct
8 Correct 248 ms 610816 KB Output is correct
9 Correct 256 ms 610872 KB Output is correct
10 Correct 257 ms 610808 KB Output is correct
11 Runtime error 596 ms 1138004 KB Execution killed with signal 6
12 Halted 0 ms 0 KB -

Subtask #2
0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 269 ms 610868 KB Output is correct
2 Correct 262 ms 610868 KB Output is correct
3 Correct 261 ms 610860 KB Output is correct
4 Correct 260 ms 610872 KB Output is correct
5 Correct 256 ms 610872 KB Output is correct
6 Correct 253 ms 610824 KB Output is correct
7 Correct 262 ms 610864 KB Output is correct
8 Correct 260 ms 610844 KB Output is correct
9 Correct 254 ms 610884 KB Output is correct
10 Correct 253 ms 610876 KB Output is correct
11 Correct 256 ms 610764 KB Output is correct
12 Correct 253 ms 610780 KB Output is correct
13 Correct 280 ms 610764 KB Output is correct
14 Correct 259 ms 610824 KB Output is correct
15 Correct 257 ms 610916 KB Output is correct
16 Correct 266 ms 610912 KB Output is correct
17 Correct 253 ms 610784 KB Output is correct
18 Correct 252 ms 610844 KB Output is correct
19 Runtime error 625 ms 1137988 KB Execution killed with signal 6
20 Halted 0 ms 0 KB -

Subtask #3
0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 265 ms 610812 KB Output is correct
2 Correct 256 ms 610780 KB Output is correct
3 Correct 248 ms 610852 KB Output is correct
4 Correct 259 ms 610856 KB Output is correct
5 Correct 254 ms 610764 KB Output is correct
6 Correct 284 ms 610864 KB Output is correct
7 Correct 250 ms 611012 KB Output is correct
8 Correct 255 ms 610840 KB Output is correct
9 Correct 264 ms 610884 KB Output is correct
10 Correct 257 ms 610768 KB Output is correct
11 Correct 251 ms 610804 KB Output is correct
12 Correct 261 ms 610908 KB Output is correct
13 Correct 252 ms 610864 KB Output is correct
14 Runtime error 583 ms 1138160 KB Execution killed with signal 6
15 Halted 0 ms 0 KB -

Subtask #4
0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 269 ms 610868 KB Output is correct
2 Correct 262 ms 610868 KB Output is correct
3 Correct 261 ms 610860 KB Output is correct
4 Correct 260 ms 610872 KB Output is correct
5 Correct 256 ms 610872 KB Output is correct
6 Correct 253 ms 610824 KB Output is correct
7 Correct 262 ms 610864 KB Output is correct
8 Correct 260 ms 610844 KB Output is correct
9 Correct 254 ms 610884 KB Output is correct
10 Correct 253 ms 610876 KB Output is correct
11 Correct 256 ms 610764 KB Output is correct
12 Correct 253 ms 610780 KB Output is correct
13 Correct 280 ms 610764 KB Output is correct
14 Correct 259 ms 610824 KB Output is correct
15 Correct 257 ms 610916 KB Output is correct
16 Correct 266 ms 610912 KB Output is correct
17 Correct 253 ms 610784 KB Output is correct
18 Correct 252 ms 610844 KB Output is correct
19 Runtime error 625 ms 1137988 KB Execution killed with signal 6
20 Halted 0 ms 0 KB -

Subtask #5
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 269 ms 610868 KB Output is correct
2 Correct 262 ms 610868 KB Output is correct
3 Correct 261 ms 610860 KB Output is correct
4 Correct 260 ms 610872 KB Output is correct
5 Correct 256 ms 610872 KB Output is correct
6 Correct 253 ms 610824 KB Output is correct
7 Correct 262 ms 610864 KB Output is correct
8 Correct 260 ms 610844 KB Output is correct
9 Correct 254 ms 610884 KB Output is correct
10 Correct 253 ms 610876 KB Output is correct
11 Correct 256 ms 610764 KB Output is correct
12 Correct 253 ms 610780 KB Output is correct
13 Correct 280 ms 610764 KB Output is correct
14 Correct 259 ms 610824 KB Output is correct
15 Correct 257 ms 610916 KB Output is correct
16 Correct 266 ms 610912 KB Output is correct
17 Correct 253 ms 610784 KB Output is correct
18 Correct 252 ms 610844 KB Output is correct
19 Runtime error 625 ms 1137988 KB Execution killed with signal 6
20 Halted 0 ms 0 KB -

Subtask #6
0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 269 ms 610864 KB Output is correct
2 Correct 255 ms 610876 KB Output is correct
3 Correct 250 ms 610776 KB Output is correct
4 Correct 253 ms 610892 KB Output is correct
5 Correct 417 ms 610816 KB Output is correct
6 Correct 254 ms 610884 KB Output is correct
7 Correct 253 ms 610908 KB Output is correct
8 Correct 248 ms 610816 KB Output is correct
9 Correct 256 ms 610872 KB Output is correct
10 Correct 257 ms 610808 KB Output is correct
11 Runtime error 596 ms 1138004 KB Execution killed with signal 6
12 Halted 0 ms 0 KB -

Subtask #7
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 269 ms 610864 KB Output is correct
2 Correct 255 ms 610876 KB Output is correct
3 Correct 250 ms 610776 KB Output is correct
4 Correct 253 ms 610892 KB Output is correct
5 Correct 417 ms 610816 KB Output is correct
6 Correct 254 ms 610884 KB Output is correct
7 Correct 253 ms 610908 KB Output is correct
8 Correct 248 ms 610816 KB Output is correct
9 Correct 256 ms 610872 KB Output is correct
10 Correct 257 ms 610808 KB Output is correct
11 Runtime error 596 ms 1138004 KB Execution killed with signal 6
12 Halted 0 ms 0 KB -

Subtask #8
0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 269 ms 610864 KB Output is correct
2 Correct 255 ms 610876 KB Output is correct
3 Correct 250 ms 610776 KB Output is correct
4 Correct 253 ms 610892 KB Output is correct
5 Correct 417 ms 610816 KB Output is correct
6 Correct 254 ms 610884 KB Output is correct
7 Correct 253 ms 610908 KB Output is correct
8 Correct 248 ms 610816 KB Output is correct
9 Correct 256 ms 610872 KB Output is correct
10 Correct 257 ms 610808 KB Output is correct
11 Runtime error 596 ms 1138004 KB Execution killed with signal 6
12 Halted 0 ms 0 KB -