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Submission #198818

# Submission time Handle Problem Language Result Execution time Memory
198818 2020-01-27T18:46:48 Z dolphingarlic Portals (BOI14_portals) C++14
70 / 100
 1000 ms 72692 KB 
#include <bits/stdc++.h>
#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) pq.push({dist - 1, graph[x][y][i]});
            FOR(i, 4, 8)
            if (graph[x][y][i].first)
                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 376 KB Output is correct
2 Correct 5 ms 504 KB Output is correct
3 Correct 5 ms 504 KB Output is correct
4 Correct 6 ms 376 KB Output is correct
5 Correct 5 ms 504 KB Output is correct
6 Correct 5 ms 504 KB Output is correct
7 Correct 6 ms 504 KB Output is correct
8 Correct 5 ms 504 KB Output is correct
9 Correct 5 ms 376 KB Output is correct
10 Correct 5 ms 376 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 376 KB Output is correct
2 Correct 5 ms 504 KB Output is correct
3 Correct 6 ms 508 KB Output is correct
4 Correct 5 ms 376 KB Output is correct
5 Correct 5 ms 504 KB Output is correct
6 Correct 5 ms 504 KB Output is correct
7 Correct 5 ms 504 KB Output is correct
8 Correct 5 ms 504 KB Output is correct
9 Correct 8 ms 1360 KB Output is correct
10 Correct 7 ms 1272 KB Output is correct
11 Correct 7 ms 1144 KB Output is correct
12 Correct 7 ms 1144 KB Output is correct
13 Correct 7 ms 1148 KB Output is correct
14 Correct 5 ms 376 KB Output is correct
15 Correct 7 ms 1144 KB Output is correct
16 Correct 5 ms 376 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 376 KB Output is correct
2 Correct 5 ms 504 KB Output is correct
3 Correct 5 ms 504 KB Output is correct
4 Correct 5 ms 504 KB Output is correct
5 Correct 29 ms 5624 KB Output is correct
6 Correct 35 ms 5624 KB Output is correct
7 Correct 28 ms 5624 KB Output is correct
8 Correct 16 ms 5624 KB Output is correct

Subtask #4
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 376 KB Output is correct
2 Correct 5 ms 504 KB Output is correct
3 Correct 5 ms 504 KB Output is correct
4 Correct 5 ms 376 KB Output is correct
5 Correct 5 ms 504 KB Output is correct
6 Correct 5 ms 504 KB Output is correct
7 Correct 6 ms 504 KB Output is correct
8 Correct 5 ms 504 KB Output is correct
9 Correct 9 ms 1272 KB Output is correct
10 Correct 7 ms 1272 KB Output is correct
11 Correct 6 ms 1144 KB Output is correct
12 Correct 7 ms 1272 KB Output is correct
13 Correct 7 ms 1144 KB Output is correct
14 Correct 27 ms 5624 KB Output is correct
15 Correct 35 ms 5624 KB Output is correct
16 Correct 28 ms 5624 KB Output is correct
17 Correct 36 ms 5624 KB Output is correct
18 Correct 43 ms 5752 KB Output is correct
19 Correct 13 ms 4984 KB Output is correct
20 Correct 32 ms 6984 KB Output is correct
21 Correct 34 ms 5624 KB Output is correct
22 Correct 30 ms 5624 KB Output is correct
23 Correct 32 ms 5624 KB Output is correct
24 Correct 78 ms 6264 KB Output is correct
25 Correct 5 ms 376 KB Output is correct
26 Correct 8 ms 1144 KB Output is correct
27 Correct 6 ms 376 KB Output is correct
28 Correct 18 ms 5624 KB Output is correct

Subtask #5
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 376 KB Output is correct
2 Correct 5 ms 504 KB Output is correct
3 Correct 6 ms 504 KB Output is correct
4 Correct 5 ms 376 KB Output is correct
5 Correct 5 ms 632 KB Output is correct
6 Correct 5 ms 504 KB Output is correct
7 Correct 5 ms 504 KB Output is correct
8 Correct 6 ms 508 KB Output is correct
9 Correct 9 ms 1272 KB Output is correct
10 Correct 8 ms 1272 KB Output is correct
11 Correct 7 ms 1144 KB Output is correct
12 Correct 7 ms 1144 KB Output is correct
13 Correct 7 ms 1144 KB Output is correct
14 Correct 34 ms 5628 KB Output is correct
15 Correct 36 ms 5624 KB Output is correct
16 Correct 28 ms 5624 KB Output is correct
17 Correct 35 ms 5752 KB Output is correct
18 Correct 43 ms 5752 KB Output is correct
19 Correct 13 ms 5112 KB Output is correct
20 Correct 33 ms 7024 KB Output is correct
21 Correct 27 ms 5624 KB Output is correct
22 Correct 31 ms 5624 KB Output is correct
23 Correct 34 ms 5624 KB Output is correct
24 Execution timed out 1091 ms 72692 KB Time limit exceeded
25 Halted 0 ms 0 KB -