oj.uz

Submission #330081

# Submission time Handle Problem Language Result Execution time Memory
330081 2020-11-23T18:14:02 Z IgorI Portals (BOI14_portals) C++17
100 / 100
 481 ms 35152 KB 
#include <bits/stdc++.h>
using namespace std;

const int MOD = 1e9 + 7;

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

    int n, m;
    cin >> n >> m;
    vector<string> s(n + 2, string(m + 2, '#'));
    for (int i = 1; i <= n; i++)
    {
        string t;
        cin >> t;
        t = "#" + t + "#";
        s[i] = t;
    }
    n += 2, m += 2;
    vector<vector<int> > up(n, vector<int>(m));
    for (int i = 1; i < n; i++)
    {
        for (int j = 0; j < m; j++)
        {
            up[i][j] = up[i - 1][j];
            if (s[i - 1][j] == '#')
                up[i][j] = i;
        }
    }
    vector<vector<int> > down(n, vector<int>(m));
    for (int i = n - 2; i >= 0; i--)
    {
        for (int j = 0; j < m; j++)
        {
            down[i][j] = down[i + 1][j];
            if (s[i + 1][j] == '#')
                down[i][j] = i;
        }
    }
    vector<vector<int> > right(n, vector<int>(m));
    vector<vector<int> > left(n, vector<int>(m));
    for (int i = 0; i < n; i++)
    {
        for (int j = 1; j < m; j++)
        {
            left[i][j] = left[i][j - 1];
            if (s[i][j - 1] == '#')
                left[i][j] = j;
        }
    }
    for (int i = 0; i < n; i++)
    {
        for (int j = m - 2; j >= 0; j--)
        {
            right[i][j] = right[i][j + 1];
            if (s[i][j + 1] == '#')
                right[i][j] = j;
        }
    }
    vector<int> cx = {0, 0, -1, 1};
    vector<int> cy = {1, -1, 0, 0};
    int sx, sy, fx, fy;
    for (int i = 0; i < n; i++)
    {
        for (int j = 0; j < m; j++)
        {
            if (s[i][j] == 'S') sx = i, sy = j;
            if (s[i][j] == 'C') fx = i, fy = j;
        }
    }
    const int INF = 1e9;
    vector<vector<int> > dist(n, vector<int>(m, INF));
    vector<vector<int> > wall(n, vector<int>(m, INF));
    dist[sx][sy] = 0;
    vector<pair<int, int> > q = {};
    for (int i = 0; i < n; i++)
    {
        for (int j = 0; j < m; j++)
        {
            if (s[i][j] == '#')
                q.push_back({i, j}), wall[i][j] = 0;
        }
    }
    auto ok = [&](int i, int j){
        return 0 <= i && i < n && 0 <= j && j < m;
    };
    for (int i = 0; i < q.size(); i++)
    {
        int x = q[i].first, y = q[i].second;
        for (int k = 0; k < 4; k++)
        {
            int nx = x + cx[k], ny = y + cy[k];
            if (ok(nx, ny) && s[nx][ny] != '#' && wall[nx][ny] > wall[x][y] + 1)
            {
                wall[nx][ny] = wall[x][y] + 1;
                q.push_back({nx, ny});
            }
        }
    }
    typedef pair<int, int> pii;
    set<pair<int, pii> > S;
    S.insert({0, {sx, sy}});
    while (S.size())
    {
        auto it = S.begin();
        int x = (*it).second.first;
        int y = (*it).second.second;
        //cout << x << " " << y << " " << dist[x][y] << endl;
        S.erase(S.begin());
        for (int k = 0; k < 4; k++)
        {
            int nx = x + cx[k], ny = y + cy[k];
            if (ok(nx, ny) && s[nx][ny] != '#' && dist[nx][ny] > dist[x][y] + 1)
            {
                S.erase({dist[nx][ny], {nx, ny}});
                dist[nx][ny] = dist[x][y] + 1;
                S.insert({dist[nx][ny], {nx, ny}});
            }
        }
        {
            int nx = up[x][y], ny = y;
            if (dist[nx][ny] > dist[x][y] + wall[x][y])
            {
                S.erase({dist[nx][ny], {nx, ny}});
                dist[nx][ny] = dist[x][y] + wall[x][y];
                S.insert({dist[nx][ny], {nx, ny}});
            }
        }
        {
            int nx = down[x][y], ny = y;
            if (dist[nx][ny] > dist[x][y] + wall[x][y])
            {
                S.erase({dist[nx][ny], {nx, ny}});
                dist[nx][ny] = dist[x][y] + wall[x][y];
                S.insert({dist[nx][ny], {nx, ny}});
            }
        }
        {
            int nx = x, ny = right[x][y];
            if (dist[nx][ny] > dist[x][y] + wall[x][y])
            {
                S.erase({dist[nx][ny], {nx, ny}});
                dist[nx][ny] = dist[x][y] + wall[x][y];
                S.insert({dist[nx][ny], {nx, ny}});
            }
        }
        {
            int nx = x, ny = left[x][y];
            if (dist[nx][ny] > dist[x][y] + wall[x][y])
            {
                S.erase({dist[nx][ny], {nx, ny}});
                dist[nx][ny] = dist[x][y] + wall[x][y];
                S.insert({dist[nx][ny], {nx, ny}});
            }
        }
    }
    cout << dist[fx][fy];
}

Compilation message

portals.cpp: In function 'int main()':
portals.cpp:89:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   89 |     for (int i = 0; i < q.size(); i++)
      |                     ~~^~~~~~~~~~
portals.cpp:76:16: warning: 'sy' may be used uninitialized in this function [-Wmaybe-uninitialized]
   76 |     dist[sx][sy] = 0;
      |                ^
portals.cpp:76:12: warning: 'sx' may be used uninitialized in this function [-Wmaybe-uninitialized]
   76 |     dist[sx][sy] = 0;
      |            ^
portals.cpp:159:24: warning: 'fy' may be used uninitialized in this function [-Wmaybe-uninitialized]
  159 |     cout << dist[fx][fy];
      |                        ^
portals.cpp:159:20: warning: 'fx' may be used uninitialized in this function [-Wmaybe-uninitialized]
  159 |     cout << dist[fx][fy];
      |                    ^

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 1 ms 492 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 384 KB Output is correct
9 Correct 1 ms 504 KB Output is correct
10 Correct 1 ms 492 KB Output is correct
11 Correct 1 ms 492 KB Output is correct
12 Correct 1 ms 512 KB Output is correct
13 Correct 1 ms 492 KB Output is correct
14 Correct 1 ms 364 KB Output is correct
15 Correct 1 ms 492 KB Output is correct
16 Correct 1 ms 364 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 9 ms 2028 KB Output is correct
6 Correct 11 ms 2028 KB Output is correct
7 Correct 11 ms 2028 KB Output is correct
8 Correct 5 ms 2028 KB Output is correct

Subtask #4
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 2 ms 492 KB Output is correct
10 Correct 2 ms 492 KB Output is correct
11 Correct 1 ms 492 KB Output is correct
12 Correct 1 ms 492 KB Output is correct
13 Correct 1 ms 512 KB Output is correct
14 Correct 12 ms 2028 KB Output is correct
15 Correct 10 ms 2028 KB Output is correct
16 Correct 11 ms 2028 KB Output is correct
17 Correct 11 ms 2028 KB Output is correct
18 Correct 13 ms 2028 KB Output is correct
19 Correct 13 ms 2028 KB Output is correct
20 Correct 12 ms 2028 KB Output is correct
21 Correct 9 ms 2028 KB Output is correct
22 Correct 10 ms 2028 KB Output is correct
23 Correct 11 ms 2028 KB Output is correct
24 Correct 12 ms 2028 KB Output is correct
25 Correct 1 ms 364 KB Output is correct
26 Correct 1 ms 492 KB Output is correct
27 Correct 1 ms 364 KB Output is correct
28 Correct 6 ms 2028 KB Output is correct

Subtask #5
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 492 KB Output is correct
10 Correct 1 ms 492 KB Output is correct
11 Correct 2 ms 492 KB Output is correct
12 Correct 1 ms 492 KB Output is correct
13 Correct 1 ms 492 KB Output is correct
14 Correct 9 ms 2028 KB Output is correct
15 Correct 10 ms 2028 KB Output is correct
16 Correct 11 ms 2028 KB Output is correct
17 Correct 11 ms 2028 KB Output is correct
18 Correct 14 ms 2028 KB Output is correct
19 Correct 12 ms 2028 KB Output is correct
20 Correct 13 ms 2156 KB Output is correct
21 Correct 9 ms 2028 KB Output is correct
22 Correct 10 ms 2048 KB Output is correct
23 Correct 11 ms 2028 KB Output is correct
24 Correct 300 ms 34528 KB Output is correct
25 Correct 481 ms 35152 KB Output is correct
26 Correct 363 ms 34528 KB Output is correct
27 Correct 399 ms 34572 KB Output is correct
28 Correct 215 ms 34528 KB Output is correct
29 Correct 245 ms 34656 KB Output is correct
30 Correct 295 ms 34564 KB Output is correct
31 Correct 11 ms 2028 KB Output is correct
32 Correct 363 ms 34528 KB Output is correct
33 Correct 1 ms 364 KB Output is correct
34 Correct 1 ms 492 KB Output is correct
35 Correct 268 ms 34528 KB Output is correct
36 Correct 1 ms 364 KB Output is correct
37 Correct 6 ms 2028 KB Output is correct
38 Correct 137 ms 34528 KB Output is correct
39 Correct 188 ms 34528 KB Output is correct