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Submission #213183

# Submission time Handle Problem Language Result Execution time Memory
213183 2020-03-25T07:08:22 Z dolphingarlic Portals (BOI14_portals) C++14
100 / 100
 689 ms 96632 KB 
#include <bits/stdc++.h>
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("sse4,avx2,fma,avx")
#define FOR(i, x, y) for (int i = x; i < y; i++)
typedef long long ll;
using namespace std;
 
bool open[1002][1002];
int n, m, visited[1002][1002], to_wall[1002][1002];
pair<int, int> graph[1002][1002][8], src, dest;
 
inline bool has_wall(int x, int y) {
    return !(open[x - 1][y] && open[x + 1][y] && open[x][y - 1] &&
             open[x][y + 1]);
}
 
int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin >> n >> m;
    FOR(i, 1, n + 1) FOR(j, 1, m + 1) {
        char c;
        cin >> c;
        if (c != '#') open[i][j] = true;
        if (c == 'S') src = {i, j};
        if (c == 'C') dest = {i, j};
    }
 
    FOR(i, 1, n + 1) FOR(j, 1, m + 1) {
        if (open[i - 1][j]) graph[i][j][0] = {i - 1, j};
        if (open[i + 1][j]) graph[i][j][1] = {i + 1, j};
        if (open[i][j - 1]) graph[i][j][2] = {i, j - 1};
        if (open[i][j + 1]) graph[i][j][3] = {i, j + 1};
    }
 
    queue<pair<int, int>> q;
    FOR(i, 1, n + 1) FOR(j, 1, m + 1) {
        if (open[i][j] && has_wall(i, j)) {
            to_wall[i][j] = 1;
            q.push({i, j});
        }
    }
    while (q.size()) {
        pair<int, int> curr = q.front();
        int x = curr.first, y = curr.second;
        q.pop();
        FOR(i, 0, 4) {
            if (!to_wall[graph[x][y][i].first][graph[x][y][i].second]) {
                to_wall[graph[x][y][i].first][graph[x][y][i].second] =
                    to_wall[x][y] + 1;
                q.push(graph[x][y][i]);
            }
        }
    }
 
    bool has = false;
    FOR(i, 0, n + 1) FOR(j, 0, m + 1) {
        if (!open[i][j])
            has = false;
        else {
            if (!has)
                graph[i][j][4] = {i, j};
            else
                graph[i][j][4] = graph[i][j - 1][4];
            has = true;
        }
    }
    FOR(j, 0, m + 1) FOR(i, 0, n + 1) {
        if (!open[i][j])
            has = false;
        else {
            if (!has)
                graph[i][j][5] = {i, j};
            else
                graph[i][j][5] = graph[i - 1][j][5];
            has = true;
        }
    }
    for (int i = n + 1; i; i--)
        for (int j = m + 1; j; j--) {
            if (!open[i][j])
                has = false;
            else {
                if (!has)
                    graph[i][j][6] = {i, j};
                else
                    graph[i][j][6] = graph[i][j + 1][6];
                has = true;
            }
        }
    for (int j = m + 1; j; j--)
        for (int i = n + 1; i; i--) {
            if (!open[i][j])
                has = false;
            else {
                if (!has)
                    graph[i][j][7] = {i, j};
                else
                    graph[i][j][7] = graph[i + 1][j][7];
                has = true;
            }
        }
 
    priority_queue<pair<int, pair<int, int>>> pq;
    pq.push({-1, src});
    while (pq.size()) {
        pair<int, int> curr = pq.top().second;
        int dist = pq.top().first, x = curr.first, y = curr.second;
        pq.pop();
        if (!visited[x][y]) {
            visited[x][y] = -dist;
            FOR(i, 0, 4)
            if (graph[x][y][i].first && !visited[graph[x][y][i].first][graph[x][y][i].second]) pq.push({dist - 1, graph[x][y][i]});
            FOR(i, 4, 8)
            if (graph[x][y][i].first && !visited[graph[x][y][i].first][graph[x][y][i].second])
                pq.push({dist - to_wall[x][y], graph[x][y][i]});
        }
        if (curr == dest) break;
    }
    cout << visited[dest.first][dest.second] - 1;
    return 0;
}

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 512 KB Output is correct
3 Correct 5 ms 512 KB Output is correct
4 Correct 5 ms 512 KB Output is correct
5 Correct 5 ms 512 KB Output is correct
6 Correct 5 ms 512 KB Output is correct
7 Correct 5 ms 512 KB Output is correct
8 Correct 5 ms 512 KB Output is correct
9 Correct 5 ms 512 KB Output is correct
10 Correct 5 ms 384 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 512 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 5 ms 640 KB Output is correct
5 Correct 5 ms 512 KB Output is correct
6 Correct 5 ms 512 KB Output is correct
7 Correct 5 ms 512 KB Output is correct
8 Correct 5 ms 512 KB Output is correct
9 Correct 6 ms 1152 KB Output is correct
10 Correct 6 ms 1280 KB Output is correct
11 Correct 5 ms 1152 KB Output is correct
12 Correct 6 ms 1152 KB Output is correct
13 Correct 6 ms 1152 KB Output is correct
14 Correct 5 ms 384 KB Output is correct
15 Correct 5 ms 1152 KB Output is correct
16 Correct 5 ms 384 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 512 KB Output is correct
3 Correct 5 ms 512 KB Output is correct
4 Correct 5 ms 512 KB Output is correct
5 Correct 17 ms 5632 KB Output is correct
6 Correct 18 ms 5632 KB Output is correct
7 Correct 16 ms 5760 KB Output is correct
8 Correct 11 ms 5760 KB Output is correct

Subtask #4
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 512 KB Output is correct
3 Correct 5 ms 512 KB Output is correct
4 Correct 5 ms 512 KB Output is correct
5 Correct 5 ms 512 KB Output is correct
6 Correct 5 ms 512 KB Output is correct
7 Correct 5 ms 512 KB Output is correct
8 Correct 5 ms 512 KB Output is correct
9 Correct 6 ms 1152 KB Output is correct
10 Correct 6 ms 1280 KB Output is correct
11 Correct 6 ms 1152 KB Output is correct
12 Correct 6 ms 1152 KB Output is correct
13 Correct 6 ms 1152 KB Output is correct
14 Correct 15 ms 5632 KB Output is correct
15 Correct 18 ms 5632 KB Output is correct
16 Correct 16 ms 5760 KB Output is correct
17 Correct 18 ms 5632 KB Output is correct
18 Correct 23 ms 5632 KB Output is correct
19 Correct 10 ms 5120 KB Output is correct
20 Correct 21 ms 7036 KB Output is correct
21 Correct 16 ms 5632 KB Output is correct
22 Correct 16 ms 5632 KB Output is correct
23 Correct 18 ms 5632 KB Output is correct
24 Correct 21 ms 5504 KB Output is correct
25 Correct 5 ms 384 KB Output is correct
26 Correct 5 ms 1152 KB Output is correct
27 Correct 5 ms 384 KB Output is correct
28 Correct 13 ms 5760 KB Output is correct

Subtask #5
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 512 KB Output is correct
3 Correct 5 ms 512 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 5 ms 512 KB Output is correct
6 Correct 5 ms 512 KB Output is correct
7 Correct 5 ms 512 KB Output is correct
8 Correct 5 ms 512 KB Output is correct
9 Correct 6 ms 1152 KB Output is correct
10 Correct 6 ms 1280 KB Output is correct
11 Correct 6 ms 1152 KB Output is correct
12 Correct 6 ms 1152 KB Output is correct
13 Correct 6 ms 1152 KB Output is correct
14 Correct 15 ms 5632 KB Output is correct
15 Correct 19 ms 5632 KB Output is correct
16 Correct 16 ms 5760 KB Output is correct
17 Correct 18 ms 5632 KB Output is correct
18 Correct 24 ms 5632 KB Output is correct
19 Correct 10 ms 5120 KB Output is correct
20 Correct 21 ms 7156 KB Output is correct
21 Correct 15 ms 5632 KB Output is correct
22 Correct 16 ms 5632 KB Output is correct
23 Correct 18 ms 5760 KB Output is correct
24 Correct 490 ms 73324 KB Output is correct
25 Correct 689 ms 73632 KB Output is correct
26 Correct 198 ms 76800 KB Output is correct
27 Correct 428 ms 96632 KB Output is correct
28 Correct 270 ms 77688 KB Output is correct
29 Correct 318 ms 73848 KB Output is correct
30 Correct 312 ms 73848 KB Output is correct
31 Correct 21 ms 5504 KB Output is correct
32 Correct 527 ms 73080 KB Output is correct
33 Correct 5 ms 512 KB Output is correct
34 Correct 6 ms 1152 KB Output is correct
35 Correct 275 ms 74900 KB Output is correct
36 Correct 5 ms 384 KB Output is correct
37 Correct 10 ms 5760 KB Output is correct
38 Correct 169 ms 78448 KB Output is correct
39 Correct 149 ms 77048 KB Output is correct