oj.uz

Submission #780265

# Submission time Handle Problem Language Result Execution time Memory
780265 2023-07-12T07:46:30 Z boris_mihov Maze (JOI23_ho_t3) C++17
0 / 100
 842 ms 1138076 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 272 ms 610740 KB Output is correct
2 Correct 261 ms 610864 KB Output is correct
3 Correct 250 ms 610880 KB Output is correct
4 Correct 252 ms 610844 KB Output is correct
5 Correct 253 ms 610828 KB Output is correct
6 Correct 253 ms 610772 KB Output is correct
7 Correct 246 ms 610884 KB Output is correct
8 Correct 257 ms 610908 KB Output is correct
9 Correct 291 ms 610864 KB Output is correct
10 Correct 666 ms 610900 KB Output is correct
11 Runtime error 842 ms 1137960 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 290 ms 610860 KB Output is correct
2 Correct 276 ms 610808 KB Output is correct
3 Correct 266 ms 610764 KB Output is correct
4 Correct 280 ms 610768 KB Output is correct
5 Correct 270 ms 610764 KB Output is correct
6 Correct 294 ms 610864 KB Output is correct
7 Correct 277 ms 610756 KB Output is correct
8 Correct 268 ms 610872 KB Output is correct
9 Correct 284 ms 610892 KB Output is correct
10 Correct 277 ms 610856 KB Output is correct
11 Correct 268 ms 610820 KB Output is correct
12 Correct 274 ms 610956 KB Output is correct
13 Correct 276 ms 610844 KB Output is correct
14 Correct 276 ms 610880 KB Output is correct
15 Correct 286 ms 610892 KB Output is correct
16 Correct 279 ms 610856 KB Output is correct
17 Correct 241 ms 610768 KB Output is correct
18 Correct 300 ms 610760 KB Output is correct
19 Runtime error 684 ms 1138052 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 260 ms 610820 KB Output is correct
2 Correct 278 ms 610828 KB Output is correct
3 Correct 293 ms 610860 KB Output is correct
4 Correct 274 ms 610828 KB Output is correct
5 Correct 266 ms 610764 KB Output is correct
6 Correct 272 ms 610868 KB Output is correct
7 Correct 262 ms 610900 KB Output is correct
8 Correct 268 ms 610824 KB Output is correct
9 Correct 285 ms 610876 KB Output is correct
10 Correct 281 ms 610760 KB Output is correct
11 Correct 343 ms 610760 KB Output is correct
12 Correct 254 ms 610904 KB Output is correct
13 Correct 307 ms 610860 KB Output is correct
14 Runtime error 690 ms 1138076 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 290 ms 610860 KB Output is correct
2 Correct 276 ms 610808 KB Output is correct
3 Correct 266 ms 610764 KB Output is correct
4 Correct 280 ms 610768 KB Output is correct
5 Correct 270 ms 610764 KB Output is correct
6 Correct 294 ms 610864 KB Output is correct
7 Correct 277 ms 610756 KB Output is correct
8 Correct 268 ms 610872 KB Output is correct
9 Correct 284 ms 610892 KB Output is correct
10 Correct 277 ms 610856 KB Output is correct
11 Correct 268 ms 610820 KB Output is correct
12 Correct 274 ms 610956 KB Output is correct
13 Correct 276 ms 610844 KB Output is correct
14 Correct 276 ms 610880 KB Output is correct
15 Correct 286 ms 610892 KB Output is correct
16 Correct 279 ms 610856 KB Output is correct
17 Correct 241 ms 610768 KB Output is correct
18 Correct 300 ms 610760 KB Output is correct
19 Runtime error 684 ms 1138052 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 290 ms 610860 KB Output is correct
2 Correct 276 ms 610808 KB Output is correct
3 Correct 266 ms 610764 KB Output is correct
4 Correct 280 ms 610768 KB Output is correct
5 Correct 270 ms 610764 KB Output is correct
6 Correct 294 ms 610864 KB Output is correct
7 Correct 277 ms 610756 KB Output is correct
8 Correct 268 ms 610872 KB Output is correct
9 Correct 284 ms 610892 KB Output is correct
10 Correct 277 ms 610856 KB Output is correct
11 Correct 268 ms 610820 KB Output is correct
12 Correct 274 ms 610956 KB Output is correct
13 Correct 276 ms 610844 KB Output is correct
14 Correct 276 ms 610880 KB Output is correct
15 Correct 286 ms 610892 KB Output is correct
16 Correct 279 ms 610856 KB Output is correct
17 Correct 241 ms 610768 KB Output is correct
18 Correct 300 ms 610760 KB Output is correct
19 Runtime error 684 ms 1138052 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 610740 KB Output is correct
2 Correct 261 ms 610864 KB Output is correct
3 Correct 250 ms 610880 KB Output is correct
4 Correct 252 ms 610844 KB Output is correct
5 Correct 253 ms 610828 KB Output is correct
6 Correct 253 ms 610772 KB Output is correct
7 Correct 246 ms 610884 KB Output is correct
8 Correct 257 ms 610908 KB Output is correct
9 Correct 291 ms 610864 KB Output is correct
10 Correct 666 ms 610900 KB Output is correct
11 Runtime error 842 ms 1137960 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 610740 KB Output is correct
2 Correct 261 ms 610864 KB Output is correct
3 Correct 250 ms 610880 KB Output is correct
4 Correct 252 ms 610844 KB Output is correct
5 Correct 253 ms 610828 KB Output is correct
6 Correct 253 ms 610772 KB Output is correct
7 Correct 246 ms 610884 KB Output is correct
8 Correct 257 ms 610908 KB Output is correct
9 Correct 291 ms 610864 KB Output is correct
10 Correct 666 ms 610900 KB Output is correct
11 Runtime error 842 ms 1137960 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 610740 KB Output is correct
2 Correct 261 ms 610864 KB Output is correct
3 Correct 250 ms 610880 KB Output is correct
4 Correct 252 ms 610844 KB Output is correct
5 Correct 253 ms 610828 KB Output is correct
6 Correct 253 ms 610772 KB Output is correct
7 Correct 246 ms 610884 KB Output is correct
8 Correct 257 ms 610908 KB Output is correct
9 Correct 291 ms 610864 KB Output is correct
10 Correct 666 ms 610900 KB Output is correct
11 Runtime error 842 ms 1137960 KB Execution killed with signal 6
12 Halted 0 ms 0 KB -