oj.uz

Submission #848163

# Submission time Handle Problem Language Result Execution time Memory
848163 2023-09-11T13:05:55 Z uped Mecho (IOI09_mecho) C++14
86 / 100
 216 ms 6404 KB 
#include<bits/stdc++.h>

using namespace std;

int dx[4] = {1, -1, 0, 0};
int dy[4] = {0, 0, 1, -1};
const int max_n = 800;

char f[max_n][max_n];
int mt[max_n][max_n];
int n, s;
pair<int, int> start;

bool inside(int i, int j) {
    return i >= 0 && i < n && j >= 0 && j < n && f[i][j] != 'T';
}

bool check(int offset) {
    queue<pair<int, int>> q;
    vector<vector<int>> ms(n, vector<int>(n, 10e7));
    ms[start.first][start.second] = 0;
    q.emplace(start.first, start.second);

    if (mt[start.first][start.second] <= offset) {
        return false;
    }

    while (!q.empty()) {
        auto [i, j] = q.front();
        q.pop();
        for (int k = 0; k < 4; ++k) {
            int ni = i + dx[k];
            int nj = j + dy[k];
            if (!inside(ni, nj)) continue;
            if (f[ni][nj] == 'D') {
                return true;
            }
            int steps = ms[i][j] + 1;
            bool possible = offset + (steps / s) < mt[ni][nj];
            if (possible && steps < ms[ni][nj]) {
                ms[ni][nj] = steps;
                q.emplace(ni, nj);
            }
        }
    }
    return false;
}

int main() {
    cin >> n >> s;
    for (int i = 0; i < n; ++i) {
        for (int j = 0; j < n; ++j) {
            mt[i][j] = 10e7;
        }
    }
    queue<pair<int, int>> q;
    for (int i = 0; i < n; ++i) {
        for (int j = 0; j < n; ++j) {
            cin >> f[i][j];
            if (f[i][j] == 'M') {
                start = {i, j};
            } else if (f[i][j] == 'H') {
                q.emplace(i, j);
                mt[i][j] = 0;
            }
        }
    }

    // make mt
    while (!q.empty()) {
        auto [i, j] = q.front();
        q.pop();
        for (int k = 0; k < 4; ++k) {
            int ni = i + dx[k];
            int nj = j + dy[k];
            if (!inside(ni, nj) || f[ni][nj] == 'D') continue;
            if (mt[i][j] + 1 < mt[ni][nj]) {
                mt[ni][nj] = mt[i][j] + 1;
                q.emplace(ni, nj);
            }
        }
    }
    if (!check(0)) {
        cout << -1;
        return 0;
    }

    int l = 0, r = 160000;
    while (r > l + 1) {
        int mid = (r + l) / 2;
        if (check(mid)) {
            l = mid;
        } else {
            r = mid;
        }
    }
    cout << l;
}

Compilation message

mecho.cpp: In function 'bool check(int)':
mecho.cpp:29:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   29 |         auto [i, j] = q.front();
      |              ^
mecho.cpp: In function 'int main()':
mecho.cpp:71:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   71 |         auto [i, j] = q.front();
      |              ^

Subtask #1
86.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 344 KB Output is correct
5 Correct 1 ms 344 KB Output is correct
6 Correct 1 ms 344 KB Output is correct
7 Correct 140 ms 6184 KB Output is correct
8 Correct 0 ms 344 KB Output is correct
9 Correct 1 ms 756 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 1 ms 344 KB Output is correct
12 Correct 1 ms 2648 KB Output is correct
13 Correct 1 ms 600 KB Output is correct
14 Correct 1 ms 2648 KB Output is correct
15 Correct 1 ms 344 KB Output is correct
16 Correct 1 ms 344 KB Output is correct
17 Correct 1 ms 344 KB Output is correct
18 Correct 0 ms 344 KB Output is correct
19 Correct 0 ms 344 KB Output is correct
20 Correct 1 ms 344 KB Output is correct
21 Correct 0 ms 600 KB Output is correct
22 Correct 1 ms 600 KB Output is correct
23 Correct 1 ms 600 KB Output is correct
24 Correct 1 ms 600 KB Output is correct
25 Correct 1 ms 2648 KB Output is correct
26 Correct 1 ms 2648 KB Output is correct
27 Correct 1 ms 2648 KB Output is correct
28 Correct 1 ms 2648 KB Output is correct
29 Correct 1 ms 2648 KB Output is correct
30 Correct 1 ms 2648 KB Output is correct
31 Correct 1 ms 2648 KB Output is correct
32 Correct 1 ms 2648 KB Output is correct
33 Correct 9 ms 3428 KB Output is correct
34 Correct 8 ms 3428 KB Output is correct
35 Correct 25 ms 3684 KB Output is correct
36 Correct 10 ms 3724 KB Output is correct
37 Correct 11 ms 3624 KB Output is correct
38 Correct 39 ms 3624 KB Output is correct
39 Correct 12 ms 3800 KB Output is correct
40 Correct 13 ms 3828 KB Output is correct
41 Correct 41 ms 4048 KB Output is correct
42 Correct 15 ms 4056 KB Output is correct
43 Correct 16 ms 4072 KB Output is correct
44 Correct 51 ms 4072 KB Output is correct
45 Correct 20 ms 4284 KB Output is correct
46 Correct 19 ms 4284 KB Output is correct
47 Correct 68 ms 4368 KB Output is correct
48 Incorrect 23 ms 4616 KB Output isn't correct
49 Correct 23 ms 4616 KB Output is correct
50 Correct 77 ms 4552 KB Output is correct
51 Incorrect 26 ms 4860 KB Output isn't correct
52 Correct 27 ms 4880 KB Output is correct
53 Correct 94 ms 4868 KB Output is correct
54 Incorrect 31 ms 5168 KB Output isn't correct
55 Correct 31 ms 5168 KB Output is correct
56 Correct 107 ms 5188 KB Output is correct
57 Incorrect 34 ms 5624 KB Output isn't correct
58 Correct 35 ms 5600 KB Output is correct
59 Correct 152 ms 5584 KB Output is correct
60 Incorrect 39 ms 6144 KB Output isn't correct
61 Correct 43 ms 6144 KB Output is correct
62 Correct 154 ms 6112 KB Output is correct
63 Correct 127 ms 6132 KB Output is correct
64 Correct 216 ms 6176 KB Output is correct
65 Correct 161 ms 6072 KB Output is correct
66 Correct 135 ms 6120 KB Output is correct
67 Correct 45 ms 6084 KB Output is correct
68 Correct 68 ms 6132 KB Output is correct
69 Correct 77 ms 6148 KB Output is correct
70 Correct 63 ms 6144 KB Output is correct
71 Correct 63 ms 6128 KB Output is correct
72 Correct 50 ms 6144 KB Output is correct
73 Correct 62 ms 6304 KB Output is correct
74 Correct 84 ms 6148 KB Output is correct
75 Correct 100 ms 6112 KB Output is correct
76 Correct 95 ms 6160 KB Output is correct
77 Correct 103 ms 6132 KB Output is correct
78 Correct 42 ms 6120 KB Output is correct
79 Correct 78 ms 6128 KB Output is correct
80 Correct 88 ms 6140 KB Output is correct
81 Correct 93 ms 6128 KB Output is correct
82 Correct 84 ms 6156 KB Output is correct
83 Correct 108 ms 6124 KB Output is correct
84 Correct 106 ms 6124 KB Output is correct
85 Correct 105 ms 6404 KB Output is correct
86 Correct 111 ms 6132 KB Output is correct
87 Correct 110 ms 6184 KB Output is correct
88 Correct 106 ms 6136 KB Output is correct
89 Correct 120 ms 6108 KB Output is correct
90 Correct 127 ms 6240 KB Output is correct
91 Correct 111 ms 6140 KB Output is correct
92 Correct 107 ms 6120 KB Output is correct