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Submission #996982

# Submission time Handle Problem Language Result Execution time Memory
996982 2024-06-11T14:32:05 Z imann Mecho (IOI09_mecho) C++17
39 / 100
 136 ms 6492 KB 
#include <iostream>
#include <array>
#include <string>
#include <queue>

const int MAX_N = 800 + 1;
const int INF = 1e9;

std::array<std::string, MAX_N> grid;
std::array<std::array<int, MAX_N>, MAX_N> minuteToBeHive, level;

void bfs(int n) {
    std::queue<std::pair<int, int>> q;
    for (int i = 0; i < n; ++i) {
        for (int j = 0; j < n; ++j) {
            minuteToBeHive[i][j] = INF;
            if (grid[i][j] == 'H') {
                q.push({i, j});
                minuteToBeHive[i][j] = 0;
            }
        }
    }

    while (!q.empty()) {
        auto v = q.front();
        q.pop();
        if (v.first > 0) {
            if (grid[v.first - 1][v.second] == 'G' || grid[v.first - 1][v.second] == 'M') {
                if (minuteToBeHive[v.first - 1][v.second] == INF)
                    q.push({v.first - 1, v.second});
                minuteToBeHive[v.first - 1][v.second] = std::min(minuteToBeHive[v.first - 1][v.second], minuteToBeHive[v.first][v.second] + 1);
            }
        }
        if (v.first < n - 1) {
            if (grid[v.first + 1][v.second] == 'G' || grid[v.first + 1][v.second] == 'M') {
                if (minuteToBeHive[v.first + 1][v.second] == INF)
                    q.push({v.first + 1, v.second});
                minuteToBeHive[v.first + 1][v.second] = std::min(minuteToBeHive[v.first + 1][v.second], minuteToBeHive[v.first][v.second] + 1);
            }
        }
        if (v.second > 0) {
            if (grid[v.first][v.second - 1] == 'G' || grid[v.first][v.second - 1] == 'M') {
                if (minuteToBeHive[v.first][v.second - 1] == INF)
                    q.push({v.first, v.second - 1});
                minuteToBeHive[v.first][v.second - 1] = std::min(minuteToBeHive[v.first][v.second - 1], minuteToBeHive[v.first][v.second] + 1);
            }
        }
        if (v.second < n - 1) {
            if (grid[v.first][v.second + 1] == 'G' || grid[v.first][v.second + 1] == 'M') {
                if (minuteToBeHive[v.first][v.second + 1] == INF)
                    q.push({v.first, v.second + 1});
                minuteToBeHive[v.first][v.second + 1] = std::min(minuteToBeHive[v.first][v.second + 1], minuteToBeHive[v.first][v.second] + 1);
            }
        }
    }
}

bool bfs2(int n, int s, int startMinute) {
    std::pair<int, int> start, end;
    std::queue<std::pair<int, int>> q;
    for (int i = 0; i < n; ++i) {
        for (int j = 0; j < n; ++j) {
            level[i][j] = INF;
            if (grid[i][j] == 'M')
                start = {i, j};
            if (grid[i][j] == 'D')
                end = {i, j};
        }
    }
    q.push(start);
    level[start.first][start.second] = 0;
    while (!q.empty()) {
        auto v = q.front();
        q.pop();
        if (v.first > 0) {
            if ((grid[v.first - 1][v.second] == 'G' || grid[v.first - 1][v.second] == 'D') && (startMinute + (level[v.first][v.second] + 1) / s < minuteToBeHive[v.first - 1][v.second])) {
                if (level[v.first - 1][v.second] == INF)
                    q.push({v.first - 1, v.second});
                level[v.first - 1][v.second] = std::min(level[v.first - 1][v.second], level[v.first][v.second] + 1);
            }
        }
        if (v.first < n - 1) {
            if ((grid[v.first + 1][v.second] == 'G' || grid[v.first + 1][v.second] == 'D') && (startMinute + (level[v.first][v.second] + 1) / s < minuteToBeHive[v.first + 1][v.second])) {
                if (level[v.first + 1][v.second] == INF)
                    q.push({v.first + 1, v.second});
                level[v.first + 1][v.second] = std::min(level[v.first + 1][v.second], level[v.first][v.second] + 1);
            }
        }
        if (v.second > 0) {
            if ((grid[v.first][v.second - 1] == 'G' || grid[v.first][v.second - 1] == 'D') && (startMinute + (level[v.first][v.second] + 1) / s < minuteToBeHive[v.first][v.second - 1])) {
                if (level[v.first][v.second - 1] == INF)
                    q.push({v.first, v.second - 1});
                level[v.first][v.second - 1] = std::min(level[v.first][v.second - 1], level[v.first][v.second] + 1);
            }
        }
        if (v.second < n - 1) {
            if ((grid[v.first][v.second + 1] == 'G' || grid[v.first][v.second + 1] == 'D') && (startMinute + (level[v.first][v.second] + 1) / s < minuteToBeHive[v.first][v.second + 1])) {
                if (level[v.first][v.second + 1] == INF)
                    q.push({v.first, v.second + 1});
                level[v.first][v.second + 1] = std::min(level[v.first][v.second + 1], level[v.first][v.second] + 1);
            }
        }
    }
    return level[end.first][end.second] != INF;
}

int solve(int n, int s) {
    bfs(n);
    int l = 0, r = n;
    while (r - l > 1) {
        int mid = (r + l) / 2;
        if (bfs2(n, s, mid)) {
            l = mid;
        } else {
            r = mid;
        }
    }

    if (bfs2(n, s, l))
        return l;
    return -1;
}

int main() {
    int n, s; std::cin >> n >> s;
    for (int i = 0; i < n; ++i) {
        std::cin >> grid[i];
    }
    std::cout << solve(n, s) << std::endl;
}

Subtask #1
39.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 0 ms 2396 KB Output is correct
3 Correct 0 ms 2396 KB Output is correct
4 Correct 0 ms 2396 KB Output is correct
5 Correct 0 ms 2396 KB Output is correct
6 Correct 0 ms 2396 KB Output is correct
7 Correct 60 ms 6196 KB Output is correct
8 Correct 1 ms 2396 KB Output is correct
9 Correct 0 ms 2396 KB Output is correct
10 Correct 1 ms 2396 KB Output is correct
11 Correct 0 ms 2396 KB Output is correct
12 Incorrect 1 ms 4700 KB Output isn't correct
13 Incorrect 1 ms 2652 KB Output isn't correct
14 Correct 1 ms 4700 KB Output is correct
15 Incorrect 1 ms 2520 KB Output isn't correct
16 Incorrect 1 ms 2396 KB Output isn't correct
17 Incorrect 1 ms 2392 KB Output isn't correct
18 Incorrect 1 ms 2396 KB Output isn't correct
19 Incorrect 1 ms 2392 KB Output isn't correct
20 Incorrect 0 ms 2396 KB Output isn't correct
21 Incorrect 0 ms 2396 KB Output isn't correct
22 Incorrect 1 ms 2396 KB Output isn't correct
23 Incorrect 1 ms 2652 KB Output isn't correct
24 Incorrect 1 ms 2652 KB Output isn't correct
25 Incorrect 1 ms 4568 KB Output isn't correct
26 Incorrect 1 ms 4700 KB Output isn't correct
27 Incorrect 1 ms 4696 KB Output isn't correct
28 Incorrect 1 ms 4700 KB Output isn't correct
29 Incorrect 1 ms 4700 KB Output isn't correct
30 Incorrect 1 ms 4700 KB Output isn't correct
31 Incorrect 1 ms 4700 KB Output isn't correct
32 Incorrect 1 ms 4696 KB Output isn't correct
33 Incorrect 10 ms 4700 KB Output isn't correct
34 Incorrect 11 ms 4700 KB Output isn't correct
35 Correct 19 ms 4916 KB Output is correct
36 Incorrect 13 ms 4940 KB Output isn't correct
37 Incorrect 14 ms 4696 KB Output isn't correct
38 Correct 20 ms 4944 KB Output is correct
39 Incorrect 16 ms 4956 KB Output isn't correct
40 Incorrect 17 ms 4956 KB Output isn't correct
41 Correct 25 ms 4964 KB Output is correct
42 Incorrect 18 ms 5224 KB Output isn't correct
43 Incorrect 21 ms 5208 KB Output isn't correct
44 Correct 31 ms 5208 KB Output is correct
45 Incorrect 24 ms 5212 KB Output isn't correct
46 Incorrect 29 ms 5212 KB Output isn't correct
47 Correct 38 ms 5212 KB Output is correct
48 Incorrect 32 ms 5212 KB Output isn't correct
49 Incorrect 33 ms 5212 KB Output isn't correct
50 Correct 44 ms 5212 KB Output is correct
51 Incorrect 36 ms 5464 KB Output isn't correct
52 Incorrect 39 ms 5464 KB Output isn't correct
53 Correct 56 ms 5464 KB Output is correct
54 Incorrect 40 ms 5720 KB Output isn't correct
55 Incorrect 44 ms 5580 KB Output isn't correct
56 Correct 100 ms 5720 KB Output is correct
57 Incorrect 44 ms 5980 KB Output isn't correct
58 Incorrect 55 ms 5976 KB Output isn't correct
59 Correct 77 ms 5980 KB Output is correct
60 Incorrect 52 ms 6236 KB Output isn't correct
61 Incorrect 57 ms 6236 KB Output isn't correct
62 Correct 88 ms 6232 KB Output is correct
63 Correct 70 ms 6232 KB Output is correct
64 Incorrect 136 ms 6224 KB Output isn't correct
65 Correct 104 ms 6232 KB Output is correct
66 Correct 91 ms 6228 KB Output is correct
67 Correct 76 ms 6232 KB Output is correct
68 Correct 36 ms 6096 KB Output is correct
69 Correct 37 ms 6228 KB Output is correct
70 Correct 32 ms 6236 KB Output is correct
71 Correct 32 ms 6228 KB Output is correct
72 Incorrect 28 ms 6084 KB Output isn't correct
73 Incorrect 35 ms 6300 KB Output isn't correct
74 Correct 42 ms 6488 KB Output is correct
75 Correct 49 ms 6480 KB Output is correct
76 Correct 44 ms 6492 KB Output is correct
77 Correct 54 ms 6352 KB Output is correct
78 Correct 54 ms 6484 KB Output is correct
79 Correct 55 ms 6488 KB Output is correct
80 Correct 48 ms 6488 KB Output is correct
81 Correct 54 ms 6476 KB Output is correct
82 Correct 50 ms 6488 KB Output is correct
83 Correct 56 ms 6236 KB Output is correct
84 Correct 55 ms 6236 KB Output is correct
85 Correct 58 ms 6236 KB Output is correct
86 Correct 62 ms 6228 KB Output is correct
87 Correct 54 ms 6488 KB Output is correct
88 Correct 57 ms 6236 KB Output is correct
89 Correct 61 ms 6236 KB Output is correct
90 Correct 68 ms 6232 KB Output is correct
91 Correct 63 ms 6236 KB Output is correct
92 Correct 63 ms 6232 KB Output is correct