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Submission #1018394

# Submission time Handle Problem Language Result Execution time Memory
1018394 2024-07-09T22:27:22 Z cryptobunny Mecho (IOI09_mecho) C++14
29 / 100
 570 ms 18516 KB 
#include <bits/stdc++.h>
using namespace std;

#define int long long

int n, s, mx, my, hx, hy;

int dx[4] = {0, 0, 1, -1};
int dy[4] = {1, -1, 0, 0};

bool check(int t, vector<vector<char>> grid, vector<vector<int>> btime) {
    priority_queue<pair<int, pair<int, int>>> q;
    q.push({0, {mx, my}});
    vector<vector<int>> dist(n, vector<int>(n, 0x3f3f3f3f));
    dist[mx][my] = 0;
    while (!q.empty()) {
        auto tp = q.top();
        q.pop();
        if (grid[tp.second.first][tp.second.second] == 'D') {
            return true;
        }
        for (int i = 0; i < 4; i++) {
            int nx = dx[i] + tp.second.first;
            int ny = dy[i] + tp.second.second;
            if (nx < 0 || nx >= n || ny < 0 || ny >= n) continue;
            if (grid[nx][ny] == 'T' || (btime[nx][ny] - t) * s <= -tp.first) continue;
            if (dist[nx][ny] > 1 - tp.first) {
                dist[nx][ny] = 1 - tp.first;
                q.push({tp.first - 1, {nx, ny}});
            }
        }
    }
    for (int i = 0; i < 4; i++) {
        int nx = dx[i] + hx;
        int ny = dy[i] + hy;
        if (nx < 0 || nx >= n || ny < 0 || ny >= n) continue;
        if (dist[nx][ny] != 0x3f3f3f3f) return true;
    }
    return false;
}

signed main() {
    cin >> n >> s;
    vector<vector<char>> grid(n, vector<char>(n));
    priority_queue<pair<int, pair<int, int>>> q;
    vector<vector<int>> btime(n, vector<int>(n, 0x3f3f3f3f));
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            cin >> grid[i][j];
            if (grid[i][j] == 'H') {
                btime[i][j] = 0;
                q.push({0, {i, j}});
            }
            if (grid[i][j] == 'M') mx = i, my = j;
            if (grid[i][j] == 'D') hx = i, hy = j;
        }
    }
    while (!q.empty()) {
        auto tp = q.top();
        q.pop();
        if (btime[tp.second.first][tp.second.second] != -tp.first) continue;
        for (int i = 0; i < 4; i++) {
            int nx = dx[i] + tp.second.first;
            int ny = dy[i] + tp.second.second;
            if (nx < 0 || nx >= n || ny < 0 || ny >= n) continue;
            if (grid[nx][ny] != 'G' && grid[nx][ny] != 'M') continue;
            if (-tp.first + 1 < btime[nx][ny]) {
                btime[nx][ny] = 1 - tp.first;
                q.push({-1 + tp.first, {nx, ny}});
            }
        }
    }

    int l = 0;
    int r = 1e9 + 1;
    while (l != r) {
        int mid = (l + r + 1)/2;
        if (check(mid, grid, btime)) {
            l = mid;
        }
        else {
            r = mid - 1;
        }
    }
    cout << l << endl;
}

Subtask #1
29.0 / 100.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 432 KB Output isn't correct
2 Incorrect 0 ms 348 KB Output isn't correct
3 Incorrect 0 ms 348 KB Output isn't correct
4 Incorrect 0 ms 348 KB Output isn't correct
5 Correct 0 ms 344 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 365 ms 17824 KB Output is correct
8 Incorrect 0 ms 348 KB Output isn't correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Incorrect 1 ms 344 KB Output isn't correct
13 Incorrect 1 ms 348 KB Output isn't correct
14 Incorrect 1 ms 348 KB Output isn't correct
15 Incorrect 1 ms 348 KB Output isn't correct
16 Correct 0 ms 348 KB Output is correct
17 Incorrect 1 ms 348 KB Output isn't correct
18 Correct 0 ms 348 KB Output is correct
19 Incorrect 0 ms 348 KB Output isn't correct
20 Correct 0 ms 460 KB Output is correct
21 Incorrect 1 ms 348 KB Output isn't correct
22 Correct 1 ms 420 KB Output is correct
23 Incorrect 1 ms 348 KB Output isn't correct
24 Correct 1 ms 348 KB Output is correct
25 Incorrect 1 ms 348 KB Output isn't correct
26 Correct 1 ms 348 KB Output is correct
27 Incorrect 1 ms 348 KB Output isn't correct
28 Correct 1 ms 600 KB Output is correct
29 Incorrect 1 ms 348 KB Output isn't correct
30 Correct 1 ms 424 KB Output is correct
31 Incorrect 1 ms 604 KB Output isn't correct
32 Correct 1 ms 604 KB Output is correct
33 Incorrect 21 ms 3792 KB Output isn't correct
34 Correct 23 ms 3772 KB Output is correct
35 Correct 75 ms 3836 KB Output is correct
36 Incorrect 38 ms 4804 KB Output isn't correct
37 Correct 25 ms 4804 KB Output is correct
38 Correct 99 ms 4828 KB Output is correct
39 Incorrect 36 ms 6048 KB Output isn't correct
40 Correct 46 ms 5928 KB Output is correct
41 Correct 141 ms 5924 KB Output is correct
42 Incorrect 45 ms 7572 KB Output isn't correct
43 Correct 40 ms 7240 KB Output is correct
44 Correct 169 ms 7252 KB Output is correct
45 Incorrect 56 ms 8792 KB Output isn't correct
46 Correct 58 ms 8640 KB Output is correct
47 Correct 226 ms 8608 KB Output is correct
48 Incorrect 84 ms 10160 KB Output isn't correct
49 Correct 72 ms 10180 KB Output is correct
50 Correct 240 ms 10140 KB Output is correct
51 Incorrect 92 ms 11864 KB Output isn't correct
52 Correct 66 ms 11924 KB Output is correct
53 Correct 308 ms 11924 KB Output is correct
54 Incorrect 92 ms 13732 KB Output isn't correct
55 Correct 106 ms 13704 KB Output is correct
56 Correct 402 ms 13592 KB Output is correct
57 Incorrect 136 ms 15676 KB Output isn't correct
58 Correct 96 ms 15596 KB Output is correct
59 Correct 451 ms 15940 KB Output is correct
60 Incorrect 134 ms 17660 KB Output isn't correct
61 Correct 146 ms 17660 KB Output is correct
62 Correct 516 ms 17652 KB Output is correct
63 Correct 313 ms 17700 KB Output is correct
64 Correct 570 ms 17596 KB Output is correct
65 Correct 478 ms 17668 KB Output is correct
66 Incorrect 373 ms 17664 KB Output isn't correct
67 Incorrect 352 ms 17636 KB Output isn't correct
68 Correct 248 ms 17660 KB Output is correct
69 Correct 219 ms 17700 KB Output is correct
70 Correct 218 ms 17956 KB Output is correct
71 Correct 169 ms 17744 KB Output is correct
72 Incorrect 197 ms 17684 KB Output isn't correct
73 Incorrect 208 ms 18396 KB Output isn't correct
74 Correct 270 ms 18352 KB Output is correct
75 Correct 290 ms 18516 KB Output is correct
76 Correct 302 ms 18352 KB Output is correct
77 Correct 285 ms 18380 KB Output is correct
78 Incorrect 329 ms 18348 KB Output isn't correct
79 Correct 281 ms 18304 KB Output is correct
80 Correct 284 ms 18340 KB Output is correct
81 Correct 315 ms 18340 KB Output is correct
82 Correct 305 ms 18304 KB Output is correct
83 Correct 323 ms 18188 KB Output is correct
84 Correct 318 ms 18268 KB Output is correct
85 Correct 342 ms 18332 KB Output is correct
86 Correct 334 ms 18164 KB Output is correct
87 Correct 343 ms 18184 KB Output is correct
88 Correct 331 ms 18144 KB Output is correct
89 Correct 357 ms 18060 KB Output is correct
90 Correct 373 ms 18108 KB Output is correct
91 Correct 391 ms 18092 KB Output is correct
92 Correct 344 ms 18064 KB Output is correct