oj.uz

Submission #780256

# Submission time Handle Problem Language Result Execution time Memory
780256 2023-07-12T07:43:31 Z boris_mihov Maze (JOI23_ho_t3) C++17
0 / 100
 614 ms 1138072 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)
    {
        for (int idx = pos ; idx < tree.size() ; idx += idx & (-idx))
        {
            tree[idx] += value;
        }
    }

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

        return pos - res;
    }

    int findKth(int 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];
            }
        }

        return idx + 1;
    }
};

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)
            {
                int res = byROW[row].findKth(curr + 1); assert(res != i);
                // assert(byROW[row].query(res) - byROW[row].query(res - 1) == 1);
                while (res < i){assert(false);}
                while (res > i){assert(false);}
            }

            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)
            {
                int res = byCOL[col].findKth(curr + 1); assert(res != i);
                // assert(byCOL[col].query(res) - byCOL[col].query(res - 1) == 1);
                while (res < i){assert(false);}
                while (res > i){assert(false);}
            }

            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

Main.cpp: In member function 'void BIT::update(int, int)':
Main.cpp:23:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |         for (int idx = pos ; idx < tree.size() ; idx += idx & (-idx))
      |                              ~~~~^~~~~~~~~~~~~
Main.cpp: In member function 'int BIT::findKth(int)':
Main.cpp:45:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |             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 237 ms 610832 KB Output is correct
2 Correct 236 ms 610860 KB Output is correct
3 Correct 245 ms 610880 KB Output is correct
4 Correct 244 ms 610828 KB Output is correct
5 Correct 255 ms 610880 KB Output is correct
6 Correct 269 ms 610772 KB Output is correct
7 Correct 258 ms 610908 KB Output is correct
8 Correct 259 ms 610848 KB Output is correct
9 Correct 261 ms 610812 KB Output is correct
10 Correct 249 ms 610868 KB Output is correct
11 Runtime error 614 ms 1138052 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 247 ms 610768 KB Output is correct
2 Correct 247 ms 610772 KB Output is correct
3 Correct 244 ms 610776 KB Output is correct
4 Correct 248 ms 610844 KB Output is correct
5 Correct 268 ms 610992 KB Output is correct
6 Correct 247 ms 610824 KB Output is correct
7 Correct 270 ms 610756 KB Output is correct
8 Correct 261 ms 610788 KB Output is correct
9 Correct 269 ms 610856 KB Output is correct
10 Correct 248 ms 610876 KB Output is correct
11 Correct 250 ms 610764 KB Output is correct
12 Correct 244 ms 610828 KB Output is correct
13 Correct 253 ms 610876 KB Output is correct
14 Correct 246 ms 610952 KB Output is correct
15 Correct 255 ms 610852 KB Output is correct
16 Correct 247 ms 610908 KB Output is correct
17 Correct 248 ms 610780 KB Output is correct
18 Correct 246 ms 610764 KB Output is correct
19 Runtime error 597 ms 1138072 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 247 ms 610860 KB Output is correct
2 Correct 249 ms 610848 KB Output is correct
3 Correct 253 ms 610948 KB Output is correct
4 Correct 245 ms 610836 KB Output is correct
5 Correct 256 ms 610764 KB Output is correct
6 Correct 247 ms 610864 KB Output is correct
7 Correct 246 ms 610884 KB Output is correct
8 Correct 291 ms 610784 KB Output is correct
9 Correct 246 ms 610880 KB Output is correct
10 Correct 262 ms 610884 KB Output is correct
11 Correct 258 ms 610764 KB Output is correct
12 Correct 249 ms 610856 KB Output is correct
13 Correct 255 ms 610936 KB Output is correct
14 Runtime error 568 ms 1137992 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 247 ms 610768 KB Output is correct
2 Correct 247 ms 610772 KB Output is correct
3 Correct 244 ms 610776 KB Output is correct
4 Correct 248 ms 610844 KB Output is correct
5 Correct 268 ms 610992 KB Output is correct
6 Correct 247 ms 610824 KB Output is correct
7 Correct 270 ms 610756 KB Output is correct
8 Correct 261 ms 610788 KB Output is correct
9 Correct 269 ms 610856 KB Output is correct
10 Correct 248 ms 610876 KB Output is correct
11 Correct 250 ms 610764 KB Output is correct
12 Correct 244 ms 610828 KB Output is correct
13 Correct 253 ms 610876 KB Output is correct
14 Correct 246 ms 610952 KB Output is correct
15 Correct 255 ms 610852 KB Output is correct
16 Correct 247 ms 610908 KB Output is correct
17 Correct 248 ms 610780 KB Output is correct
18 Correct 246 ms 610764 KB Output is correct
19 Runtime error 597 ms 1138072 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 247 ms 610768 KB Output is correct
2 Correct 247 ms 610772 KB Output is correct
3 Correct 244 ms 610776 KB Output is correct
4 Correct 248 ms 610844 KB Output is correct
5 Correct 268 ms 610992 KB Output is correct
6 Correct 247 ms 610824 KB Output is correct
7 Correct 270 ms 610756 KB Output is correct
8 Correct 261 ms 610788 KB Output is correct
9 Correct 269 ms 610856 KB Output is correct
10 Correct 248 ms 610876 KB Output is correct
11 Correct 250 ms 610764 KB Output is correct
12 Correct 244 ms 610828 KB Output is correct
13 Correct 253 ms 610876 KB Output is correct
14 Correct 246 ms 610952 KB Output is correct
15 Correct 255 ms 610852 KB Output is correct
16 Correct 247 ms 610908 KB Output is correct
17 Correct 248 ms 610780 KB Output is correct
18 Correct 246 ms 610764 KB Output is correct
19 Runtime error 597 ms 1138072 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 237 ms 610832 KB Output is correct
2 Correct 236 ms 610860 KB Output is correct
3 Correct 245 ms 610880 KB Output is correct
4 Correct 244 ms 610828 KB Output is correct
5 Correct 255 ms 610880 KB Output is correct
6 Correct 269 ms 610772 KB Output is correct
7 Correct 258 ms 610908 KB Output is correct
8 Correct 259 ms 610848 KB Output is correct
9 Correct 261 ms 610812 KB Output is correct
10 Correct 249 ms 610868 KB Output is correct
11 Runtime error 614 ms 1138052 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 237 ms 610832 KB Output is correct
2 Correct 236 ms 610860 KB Output is correct
3 Correct 245 ms 610880 KB Output is correct
4 Correct 244 ms 610828 KB Output is correct
5 Correct 255 ms 610880 KB Output is correct
6 Correct 269 ms 610772 KB Output is correct
7 Correct 258 ms 610908 KB Output is correct
8 Correct 259 ms 610848 KB Output is correct
9 Correct 261 ms 610812 KB Output is correct
10 Correct 249 ms 610868 KB Output is correct
11 Runtime error 614 ms 1138052 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 237 ms 610832 KB Output is correct
2 Correct 236 ms 610860 KB Output is correct
3 Correct 245 ms 610880 KB Output is correct
4 Correct 244 ms 610828 KB Output is correct
5 Correct 255 ms 610880 KB Output is correct
6 Correct 269 ms 610772 KB Output is correct
7 Correct 258 ms 610908 KB Output is correct
8 Correct 259 ms 610848 KB Output is correct
9 Correct 261 ms 610812 KB Output is correct
10 Correct 249 ms 610868 KB Output is correct
11 Runtime error 614 ms 1138052 KB Execution killed with signal 6
12 Halted 0 ms 0 KB -