oj.uz

Submission #848109

# Submission time Handle Problem Language Result Execution time Memory
848109 2023-09-11T10:49:28 Z uped Mecho (IOI09_mecho) C++14
70 / 100
 183 ms 6380 KB 
#include<bits/stdc++.h>

using namespace std;

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

int main() {
    int n, s;
    cin >> n >> s;
    vector<vector<char>> f(n, vector<char>(n));
    queue<pair<int, int>> q;
    vector<vector<int>> mt(n, vector<int>(n, INT32_MAX));
    pair<int, int> start;
    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;
            }
        }
    }

    auto inside = [&](int i, int j) {
        return i >= 0 && i < n && j >= 0 && j < n && f[i][j] != 'T';
    };
    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 (mt[i][j] + 1 < mt[ni][nj]) {
                mt[ni][nj] = mt[i][j] + 1;
                q.emplace(ni, nj);
            }
        }
    }

    bool fl = false;
    int l = -1, r = 160000;
    while (r > l + 1) {
        while (!q.empty()) q.pop();
        int mid = (l + r) / 2;
        vector<vector<int>> ms(n, vector<int>(n, INT32_MAX));
        ms[start.first][start.second] = 0;
        bool good = false;
        q.emplace(start.first, start.second);
        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') {
                    good = true;
                    fl = true;
                    break;
                }
                int steps = ms[i][j] + 1;
                bool possible = mid + (steps / s) < mt[ni][nj];

                if (possible && steps < ms[ni][nj]) {
                    ms[ni][nj] = steps;
                    q.emplace(ni, nj);
                }
            }
            if (good) break;
        }
        if (good) {
            l = mid;
        } else {
            r = mid;
        }
    }
    cout << l;
}

Compilation message

mecho.cpp: In function 'int main()':
mecho.cpp:31:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   31 |         auto [i, j] = q.front();
      |              ^
mecho.cpp:54:18: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   54 |             auto [i, j] = q.front();
      |                  ^
mecho.cpp:44:10: warning: variable 'fl' set but not used [-Wunused-but-set-variable]
   44 |     bool fl = false;
      |          ^~

Subtask #1
70.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 101 ms 6212 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Incorrect 0 ms 348 KB Output isn't correct
13 Incorrect 0 ms 348 KB Output isn't correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 344 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 344 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 0 ms 348 KB Output is correct
26 Correct 1 ms 348 KB Output is correct
27 Correct 0 ms 348 KB Output is correct
28 Correct 1 ms 348 KB Output is correct
29 Correct 1 ms 348 KB Output is correct
30 Correct 1 ms 348 KB Output is correct
31 Correct 1 ms 348 KB Output is correct
32 Correct 1 ms 348 KB Output is correct
33 Correct 9 ms 1544 KB Output is correct
34 Correct 8 ms 1532 KB Output is correct
35 Correct 23 ms 1548 KB Output is correct
36 Correct 10 ms 1884 KB Output is correct
37 Correct 12 ms 1756 KB Output is correct
38 Correct 35 ms 1764 KB Output is correct
39 Correct 15 ms 2248 KB Output is correct
40 Correct 12 ms 2252 KB Output is correct
41 Correct 37 ms 2252 KB Output is correct
42 Correct 15 ms 2668 KB Output is correct
43 Correct 15 ms 2680 KB Output is correct
44 Correct 43 ms 2700 KB Output is correct
45 Correct 20 ms 3148 KB Output is correct
46 Correct 19 ms 3180 KB Output is correct
47 Correct 53 ms 3128 KB Output is correct
48 Incorrect 22 ms 3712 KB Output isn't correct
49 Correct 22 ms 3668 KB Output is correct
50 Correct 62 ms 3708 KB Output is correct
51 Incorrect 26 ms 4224 KB Output isn't correct
52 Correct 25 ms 4188 KB Output is correct
53 Correct 84 ms 4188 KB Output is correct
54 Incorrect 36 ms 5348 KB Output isn't correct
55 Correct 30 ms 4868 KB Output is correct
56 Correct 95 ms 4808 KB Output is correct
57 Incorrect 34 ms 5492 KB Output isn't correct
58 Correct 37 ms 5468 KB Output is correct
59 Correct 111 ms 5456 KB Output is correct
60 Incorrect 38 ms 6204 KB Output isn't correct
61 Correct 43 ms 6280 KB Output is correct
62 Correct 127 ms 6160 KB Output is correct
63 Correct 109 ms 6168 KB Output is correct
64 Correct 183 ms 6172 KB Output is correct
65 Correct 159 ms 6128 KB Output is correct
66 Correct 121 ms 6164 KB Output is correct
67 Correct 134 ms 6144 KB Output is correct
68 Correct 64 ms 6212 KB Output is correct
69 Correct 64 ms 6192 KB Output is correct
70 Correct 64 ms 6380 KB Output is correct
71 Correct 60 ms 6216 KB Output is correct
72 Incorrect 56 ms 6164 KB Output isn't correct
73 Incorrect 69 ms 6232 KB Output isn't correct
74 Correct 73 ms 6224 KB Output is correct
75 Correct 84 ms 6232 KB Output is correct
76 Correct 76 ms 6208 KB Output is correct
77 Correct 78 ms 6200 KB Output is correct
78 Correct 88 ms 6188 KB Output is correct
79 Correct 65 ms 6208 KB Output is correct
80 Correct 75 ms 6216 KB Output is correct
81 Correct 82 ms 6176 KB Output is correct
82 Correct 80 ms 6176 KB Output is correct
83 Correct 109 ms 6188 KB Output is correct
84 Correct 88 ms 6240 KB Output is correct
85 Correct 98 ms 6208 KB Output is correct
86 Correct 89 ms 6188 KB Output is correct
87 Correct 88 ms 6188 KB Output is correct
88 Correct 103 ms 6184 KB Output is correct
89 Correct 94 ms 6224 KB Output is correct
90 Correct 114 ms 6260 KB Output is correct
91 Correct 97 ms 6248 KB Output is correct
92 Correct 100 ms 6212 KB Output is correct