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Submission #689593

# Submission time Handle Problem Language Result Execution time Memory
689593 2023-01-28T19:32:58 Z tcmmichaelb139 Mecho (IOI09_mecho) C++17
100 / 100
 230 ms 6312 KB 
#include "bits/stdc++.h"
using namespace std;

const int dx[] = {1, 0, -1, 0}, dy[] = {0, 1, 0, -1};

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

    int n, s;
    cin >> n >> s;
    vector<vector<char>> ar(n, vector<char>(n));
    pair<int, int> start, end;
    for (int i = 0; i < n; i++)
        for (int j = 0; j < n; j++) {
            cin >> ar[i][j];
            if (ar[i][j] == 'M')
                start = {i, j};
            else if (ar[i][j] == 'D')
                end = {i, j};
        }

    auto bee_dist_gen = [&]() {
        vector<vector<int>> dist(n, vector<int>(n, 1e9));
        queue<pair<int, int>> q;
        for (int i = 0; i < n; i++)
            for (int j = 0; j < n; j++)
                if (ar[i][j] == 'H')
                    q.push({i, j}), dist[i][j] = 0;

        while (!q.empty()) {
            pair<int, int> v = q.front();
            q.pop();

            for (int i = 0; i < 4; i++) {
                int nx = v.first + dx[i], ny = v.second + dy[i];
                if (nx < 0 || ny < 0 || nx >= n || ny >= n) continue;
                if (ar[nx][ny] == 'T' || ar[nx][ny] == 'D') continue;
                if (dist[nx][ny] <= dist[v.first][v.second] + 1) continue;

                dist[nx][ny] = dist[v.first][v.second] + 1;
                q.push({nx, ny});
            }
        }

        return dist;
    };

    vector<vector<int>> bee_dist = bee_dist_gen();

    auto test_honey = [&](int honey) {
        vector<vector<int>> dist(n, vector<int>(n, 1e9));
        dist[start.first][start.second] = 0;

        queue<pair<int, int>> q;
        q.push(start);
        while (!q.empty()) {
            pair<int, int> v = q.front();
            q.pop();

            if (bee_dist[v.first][v.second] <= honey + dist[v.first][v.second] / s) continue;

            if (end == v) return true;

            for (int i = 0; i < 4; i++) {
                int nx = v.first + dx[i], ny = v.second + dy[i];
                if (nx < 0 || ny < 0 || nx >= n || ny >= n) continue;
                if (ar[nx][ny] == 'T') continue;
                if (dist[nx][ny] <= dist[v.first][v.second] + 1) continue;

                dist[nx][ny] = dist[v.first][v.second] + 1;

                q.push({nx, ny});
            }
        }
        return false;
    };

    int l = 0, r = 1e9;
    while (l < r) {
        int mid = l + (r - l + 1) / 2;
        if (test_honey(mid))
            l = mid;
        else
            r = mid - 1;
    }
    if (test_honey(l))
        cout << l << '\n';
    else
        cout << -1 << '\n';
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 114 ms 6144 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 0 ms 212 KB Output is correct
16 Correct 0 ms 212 KB Output is correct
17 Correct 1 ms 212 KB Output is correct
18 Correct 1 ms 212 KB Output is correct
19 Correct 0 ms 212 KB Output is correct
20 Correct 1 ms 212 KB Output is correct
21 Correct 1 ms 212 KB Output is correct
22 Correct 1 ms 212 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 1 ms 340 KB Output is correct
25 Correct 0 ms 340 KB Output is correct
26 Correct 1 ms 340 KB Output is correct
27 Correct 1 ms 340 KB Output is correct
28 Correct 1 ms 340 KB Output is correct
29 Correct 1 ms 340 KB Output is correct
30 Correct 1 ms 340 KB Output is correct
31 Correct 1 ms 340 KB Output is correct
32 Correct 1 ms 340 KB Output is correct
33 Correct 7 ms 1428 KB Output is correct
34 Correct 8 ms 1544 KB Output is correct
35 Correct 31 ms 1516 KB Output is correct
36 Correct 9 ms 1772 KB Output is correct
37 Correct 9 ms 1652 KB Output is correct
38 Correct 33 ms 1780 KB Output is correct
39 Correct 12 ms 2148 KB Output is correct
40 Correct 12 ms 2224 KB Output is correct
41 Correct 48 ms 2148 KB Output is correct
42 Correct 15 ms 2572 KB Output is correct
43 Correct 14 ms 2580 KB Output is correct
44 Correct 61 ms 2648 KB Output is correct
45 Correct 19 ms 3040 KB Output is correct
46 Correct 19 ms 3144 KB Output is correct
47 Correct 66 ms 3060 KB Output is correct
48 Correct 21 ms 3548 KB Output is correct
49 Correct 22 ms 3552 KB Output is correct
50 Correct 82 ms 3544 KB Output is correct
51 Correct 28 ms 4200 KB Output is correct
52 Correct 27 ms 4204 KB Output is correct
53 Correct 102 ms 4176 KB Output is correct
54 Correct 29 ms 4800 KB Output is correct
55 Correct 29 ms 4796 KB Output is correct
56 Correct 109 ms 4776 KB Output is correct
57 Correct 34 ms 5512 KB Output is correct
58 Correct 34 ms 5412 KB Output is correct
59 Correct 132 ms 5404 KB Output is correct
60 Correct 38 ms 6236 KB Output is correct
61 Correct 41 ms 6268 KB Output is correct
62 Correct 160 ms 6160 KB Output is correct
63 Correct 124 ms 6196 KB Output is correct
64 Correct 214 ms 6124 KB Output is correct
65 Correct 230 ms 6104 KB Output is correct
66 Correct 164 ms 6280 KB Output is correct
67 Correct 141 ms 6104 KB Output is correct
68 Correct 75 ms 6252 KB Output is correct
69 Correct 75 ms 6108 KB Output is correct
70 Correct 67 ms 6144 KB Output is correct
71 Correct 55 ms 6128 KB Output is correct
72 Correct 58 ms 6128 KB Output is correct
73 Correct 59 ms 6120 KB Output is correct
74 Correct 112 ms 6116 KB Output is correct
75 Correct 108 ms 6180 KB Output is correct
76 Correct 91 ms 6108 KB Output is correct
77 Correct 97 ms 6156 KB Output is correct
78 Correct 112 ms 6212 KB Output is correct
79 Correct 86 ms 6120 KB Output is correct
80 Correct 99 ms 6136 KB Output is correct
81 Correct 96 ms 6280 KB Output is correct
82 Correct 86 ms 6120 KB Output is correct
83 Correct 107 ms 6120 KB Output is correct
84 Correct 100 ms 6120 KB Output is correct
85 Correct 102 ms 6164 KB Output is correct
86 Correct 133 ms 6160 KB Output is correct
87 Correct 108 ms 6136 KB Output is correct
88 Correct 116 ms 6140 KB Output is correct
89 Correct 114 ms 6132 KB Output is correct
90 Correct 113 ms 6312 KB Output is correct
91 Correct 114 ms 6244 KB Output is correct
92 Correct 115 ms 6124 KB Output is correct