oj.uz

Submission #343234

# Submission time Handle Problem Language Result Execution time Memory
343234 2021-01-03T14:50:49 Z blue Portals (BOI14_portals) C++11
100 / 100
 859 ms 198960 KB 
#include <iostream>
#include <vector>
#include <set>
#include <queue>
using namespace std;

int R;
int C;
vector<int> edge[1002*1002];
vector<int> dist[1002*1002];
vector<int> blocked(1002*1002, 1);

vector<int> go_up(1002*1002, -1);
vector<int> go_down(1002*1002, -1);
vector<int> go_left(1002*1002, -1);
vector<int> go_right(1002*1002, -1);


vector<int> min_dist(1002*1002, 1e9);
vector<int> visit(1002*1002, 0);

int start;
int cake;

int u, v, w;

int pos(int r, int c)
{
    return (C+2)*r + c;
}

int pair_dist(int x, int y)
{
    return abs( (x % (C+2)) - (y % (C+2)) )  +  abs( (x / (C+2)) - (y / (C+2)) );
}







int main()
{
//Input
    cin >> R >> C;

    char c;

    for(int i = 1; i <= R; i++)
    {
        for(int j = 1; j <= C; j++)
        {
            cin >> c;
            if(c == '#') continue;

            blocked[pos(i, j)] = 0;

            if(c == 'S') start = pos(i, j);
            else if(c == 'C') cake = pos(i, j);
        }
    }





    for(int i = 0; i < 1002*1002; i++)
    {
        go_up[i] = go_left[i] = go_down[i] = go_right[i] = i;
    }






    for(int i = 0; i < 1002*1002; i++)
    {
        if(blocked[i]) continue;
        go_up[i] = go_up[i - (C+2)];
        go_left[i] = go_left[i-1];
    }

    for(int i = 1002*1002 - 1; i >= 0; i--)
    {
        if(blocked[i]) continue;
        go_down[i] = go_down[i + (C+2)];
        go_right[i] = go_right[i+1];
    }






    for(int i = 1; i <= R; i++)
    {
        for(int j = 1; j <= C; j++)
        {
            u = pos(i, j); //try swapping the two blocks of code.
            if(blocked[u]) continue;

            for(int v: {u-1, u+1, u-(C+2), u+(C+2)})
            {
                if(blocked[v]) continue;
                edge[u].push_back(v);
                dist[u].push_back(1);
            }



            w = 1e9;
            for(int q: {go_left[u], go_right[u], go_up[u], go_down[u]})
            {
                w = min(w, pair_dist(u, q) - 1);
            }

            for(int q: {go_left[u] + 1, go_right[u] - 1, go_up[u] + (C+2), go_down[u] - (C+2)} )
            {
                if(pair_dist(u, q) > w+1)
                {
                    edge[u].push_back(q);
                    dist[u].push_back(w+1);
                }
            }

            // cout << "u: " << u << '\n';
            // for(int g = 0; g < edge[u].size(); g++)
            // {
            //     cout << edge[u][g] << ' ' << dist[u][g] << '\n';
            // }
            // cout << "________________________________\n";
        }
    }









    min_dist[start] = 0;

    vector<int> dist_pos[R*C];
    dist_pos[0].push_back(start);

    for(int i = 0; i < R*C; i++)
    {
        for(int u: dist_pos[i])
        {
            if(visit[u]) continue;
            visit[u] = 1;

            for(int j = 0; j < edge[u].size(); j++)
            {
                v = edge[u][j];
                w = dist[u][j];

                if(min_dist[v] > min_dist[u] + w && R*C > min_dist[u] + w)
                {
                    min_dist[v] = min_dist[u] + w;
                    dist_pos[ min_dist[v] ].push_back(v);
                }
            }
        }
    }

    cout << min_dist[cake] << '\n';
}

Compilation message

portals.cpp: In function 'int main()':
portals.cpp:157:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  157 |             for(int j = 0; j < edge[u].size(); j++)
      |                            ~~^~~~~~~~~~~~~~~~

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 50 ms 74988 KB Output is correct
2 Correct 53 ms 74988 KB Output is correct
3 Correct 58 ms 74988 KB Output is correct
4 Correct 51 ms 74988 KB Output is correct
5 Correct 49 ms 74988 KB Output is correct
6 Correct 51 ms 74988 KB Output is correct
7 Correct 49 ms 74936 KB Output is correct
8 Correct 59 ms 75060 KB Output is correct
9 Correct 59 ms 74988 KB Output is correct
10 Correct 53 ms 74988 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 52 ms 75116 KB Output is correct
2 Correct 53 ms 74988 KB Output is correct
3 Correct 56 ms 74988 KB Output is correct
4 Correct 51 ms 74988 KB Output is correct
5 Correct 61 ms 74988 KB Output is correct
6 Correct 55 ms 74988 KB Output is correct
7 Correct 54 ms 75116 KB Output is correct
8 Correct 51 ms 75052 KB Output is correct
9 Correct 63 ms 75232 KB Output is correct
10 Correct 56 ms 75244 KB Output is correct
11 Correct 52 ms 75116 KB Output is correct
12 Correct 56 ms 75116 KB Output is correct
13 Correct 53 ms 75116 KB Output is correct
14 Correct 55 ms 74988 KB Output is correct
15 Correct 54 ms 75244 KB Output is correct
16 Correct 52 ms 74988 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 50 ms 74988 KB Output is correct
2 Correct 54 ms 75004 KB Output is correct
3 Correct 52 ms 74988 KB Output is correct
4 Correct 59 ms 74988 KB Output is correct
5 Correct 70 ms 77548 KB Output is correct
6 Correct 67 ms 77676 KB Output is correct
7 Correct 70 ms 77932 KB Output is correct
8 Correct 67 ms 78444 KB Output is correct

Subtask #4
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 50 ms 74988 KB Output is correct
2 Correct 50 ms 74988 KB Output is correct
3 Correct 53 ms 74988 KB Output is correct
4 Correct 59 ms 74988 KB Output is correct
5 Correct 52 ms 74988 KB Output is correct
6 Correct 52 ms 74988 KB Output is correct
7 Correct 56 ms 75116 KB Output is correct
8 Correct 54 ms 74988 KB Output is correct
9 Correct 59 ms 75244 KB Output is correct
10 Correct 54 ms 75244 KB Output is correct
11 Correct 52 ms 75116 KB Output is correct
12 Correct 58 ms 75116 KB Output is correct
13 Correct 55 ms 75116 KB Output is correct
14 Correct 67 ms 77548 KB Output is correct
15 Correct 68 ms 77644 KB Output is correct
16 Correct 70 ms 77940 KB Output is correct
17 Correct 69 ms 78060 KB Output is correct
18 Correct 86 ms 78700 KB Output is correct
19 Correct 88 ms 79852 KB Output is correct
20 Correct 79 ms 79892 KB Output is correct
21 Correct 67 ms 77676 KB Output is correct
22 Correct 67 ms 77544 KB Output is correct
23 Correct 67 ms 77676 KB Output is correct
24 Correct 89 ms 79852 KB Output is correct
25 Correct 53 ms 74988 KB Output is correct
26 Correct 57 ms 75244 KB Output is correct
27 Correct 52 ms 74988 KB Output is correct
28 Correct 67 ms 78444 KB Output is correct

Subtask #5
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 53 ms 75116 KB Output is correct
2 Correct 52 ms 74988 KB Output is correct
3 Correct 55 ms 75116 KB Output is correct
4 Correct 55 ms 74988 KB Output is correct
5 Correct 52 ms 74988 KB Output is correct
6 Correct 59 ms 74988 KB Output is correct
7 Correct 57 ms 74988 KB Output is correct
8 Correct 54 ms 74988 KB Output is correct
9 Correct 55 ms 75244 KB Output is correct
10 Correct 53 ms 75244 KB Output is correct
11 Correct 51 ms 75116 KB Output is correct
12 Correct 54 ms 75208 KB Output is correct
13 Correct 53 ms 75116 KB Output is correct
14 Correct 71 ms 77548 KB Output is correct
15 Correct 65 ms 77676 KB Output is correct
16 Correct 67 ms 78060 KB Output is correct
17 Correct 69 ms 78060 KB Output is correct
18 Correct 74 ms 78700 KB Output is correct
19 Correct 78 ms 79852 KB Output is correct
20 Correct 80 ms 79872 KB Output is correct
21 Correct 68 ms 77676 KB Output is correct
22 Correct 74 ms 77572 KB Output is correct
23 Correct 75 ms 77676 KB Output is correct
24 Correct 528 ms 157640 KB Output is correct
25 Correct 859 ms 198056 KB Output is correct
26 Correct 746 ms 198960 KB Output is correct
27 Correct 751 ms 198252 KB Output is correct
28 Correct 435 ms 141164 KB Output is correct
29 Correct 440 ms 141092 KB Output is correct
30 Correct 455 ms 142592 KB Output is correct
31 Correct 77 ms 79852 KB Output is correct
32 Correct 752 ms 198508 KB Output is correct
33 Correct 52 ms 74988 KB Output is correct
34 Correct 54 ms 75244 KB Output is correct
35 Correct 569 ms 165740 KB Output is correct
36 Correct 52 ms 74988 KB Output is correct
37 Correct 66 ms 78572 KB Output is correct
38 Correct 419 ms 162028 KB Output is correct
39 Correct 374 ms 133356 KB Output is correct