oj.uz

Submission #780239

# Submission time Handle Problem Language Result Execution time Memory
780239 2023-07-12T07:36:52 Z boris_mihov Maze (JOI23_ho_t3) C++17
0 / 100
 590 ms 1123720 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)
            {
                assert(byROW[row].findKth(curr + 1) < i);
                while (byROW[row].findKth(curr + 1) > i);
            }

            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(byCOL[col].findKth(curr + 1) < i);
                while (byCOL[col].findKth(curr + 1) > i);
            }

            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 272 ms 610816 KB Output is correct
2 Correct 250 ms 610868 KB Output is correct
3 Correct 240 ms 610852 KB Output is correct
4 Correct 240 ms 610872 KB Output is correct
5 Correct 260 ms 610952 KB Output is correct
6 Correct 242 ms 610832 KB Output is correct
7 Correct 243 ms 610892 KB Output is correct
8 Correct 244 ms 610884 KB Output is correct
9 Correct 241 ms 610904 KB Output is correct
10 Correct 243 ms 610828 KB Output is correct
11 Runtime error 590 ms 1105132 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 249 ms 610864 KB Output is correct
2 Correct 243 ms 610772 KB Output is correct
3 Correct 241 ms 610868 KB Output is correct
4 Correct 247 ms 611092 KB Output is correct
5 Correct 248 ms 610884 KB Output is correct
6 Correct 241 ms 610804 KB Output is correct
7 Correct 243 ms 610836 KB Output is correct
8 Correct 244 ms 610844 KB Output is correct
9 Correct 244 ms 610840 KB Output is correct
10 Correct 248 ms 610980 KB Output is correct
11 Correct 242 ms 610764 KB Output is correct
12 Correct 245 ms 610792 KB Output is correct
13 Correct 246 ms 610764 KB Output is correct
14 Correct 251 ms 610880 KB Output is correct
15 Correct 242 ms 610788 KB Output is correct
16 Correct 242 ms 610848 KB Output is correct
17 Correct 243 ms 610788 KB Output is correct
18 Correct 241 ms 610804 KB Output is correct
19 Runtime error 577 ms 1116412 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 267 ms 610752 KB Output is correct
2 Correct 247 ms 610784 KB Output is correct
3 Correct 245 ms 610864 KB Output is correct
4 Correct 250 ms 610824 KB Output is correct
5 Correct 242 ms 610848 KB Output is correct
6 Correct 246 ms 610808 KB Output is correct
7 Correct 250 ms 610796 KB Output is correct
8 Correct 246 ms 610860 KB Output is correct
9 Correct 248 ms 610816 KB Output is correct
10 Correct 241 ms 610848 KB Output is correct
11 Correct 245 ms 610884 KB Output is correct
12 Correct 250 ms 610804 KB Output is correct
13 Correct 244 ms 610776 KB Output is correct
14 Runtime error 563 ms 1123720 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 249 ms 610864 KB Output is correct
2 Correct 243 ms 610772 KB Output is correct
3 Correct 241 ms 610868 KB Output is correct
4 Correct 247 ms 611092 KB Output is correct
5 Correct 248 ms 610884 KB Output is correct
6 Correct 241 ms 610804 KB Output is correct
7 Correct 243 ms 610836 KB Output is correct
8 Correct 244 ms 610844 KB Output is correct
9 Correct 244 ms 610840 KB Output is correct
10 Correct 248 ms 610980 KB Output is correct
11 Correct 242 ms 610764 KB Output is correct
12 Correct 245 ms 610792 KB Output is correct
13 Correct 246 ms 610764 KB Output is correct
14 Correct 251 ms 610880 KB Output is correct
15 Correct 242 ms 610788 KB Output is correct
16 Correct 242 ms 610848 KB Output is correct
17 Correct 243 ms 610788 KB Output is correct
18 Correct 241 ms 610804 KB Output is correct
19 Runtime error 577 ms 1116412 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 249 ms 610864 KB Output is correct
2 Correct 243 ms 610772 KB Output is correct
3 Correct 241 ms 610868 KB Output is correct
4 Correct 247 ms 611092 KB Output is correct
5 Correct 248 ms 610884 KB Output is correct
6 Correct 241 ms 610804 KB Output is correct
7 Correct 243 ms 610836 KB Output is correct
8 Correct 244 ms 610844 KB Output is correct
9 Correct 244 ms 610840 KB Output is correct
10 Correct 248 ms 610980 KB Output is correct
11 Correct 242 ms 610764 KB Output is correct
12 Correct 245 ms 610792 KB Output is correct
13 Correct 246 ms 610764 KB Output is correct
14 Correct 251 ms 610880 KB Output is correct
15 Correct 242 ms 610788 KB Output is correct
16 Correct 242 ms 610848 KB Output is correct
17 Correct 243 ms 610788 KB Output is correct
18 Correct 241 ms 610804 KB Output is correct
19 Runtime error 577 ms 1116412 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 272 ms 610816 KB Output is correct
2 Correct 250 ms 610868 KB Output is correct
3 Correct 240 ms 610852 KB Output is correct
4 Correct 240 ms 610872 KB Output is correct
5 Correct 260 ms 610952 KB Output is correct
6 Correct 242 ms 610832 KB Output is correct
7 Correct 243 ms 610892 KB Output is correct
8 Correct 244 ms 610884 KB Output is correct
9 Correct 241 ms 610904 KB Output is correct
10 Correct 243 ms 610828 KB Output is correct
11 Runtime error 590 ms 1105132 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 272 ms 610816 KB Output is correct
2 Correct 250 ms 610868 KB Output is correct
3 Correct 240 ms 610852 KB Output is correct
4 Correct 240 ms 610872 KB Output is correct
5 Correct 260 ms 610952 KB Output is correct
6 Correct 242 ms 610832 KB Output is correct
7 Correct 243 ms 610892 KB Output is correct
8 Correct 244 ms 610884 KB Output is correct
9 Correct 241 ms 610904 KB Output is correct
10 Correct 243 ms 610828 KB Output is correct
11 Runtime error 590 ms 1105132 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 272 ms 610816 KB Output is correct
2 Correct 250 ms 610868 KB Output is correct
3 Correct 240 ms 610852 KB Output is correct
4 Correct 240 ms 610872 KB Output is correct
5 Correct 260 ms 610952 KB Output is correct
6 Correct 242 ms 610832 KB Output is correct
7 Correct 243 ms 610892 KB Output is correct
8 Correct 244 ms 610884 KB Output is correct
9 Correct 241 ms 610904 KB Output is correct
10 Correct 243 ms 610828 KB Output is correct
11 Runtime error 590 ms 1105132 KB Execution killed with signal 6
12 Halted 0 ms 0 KB -