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Submission #759138

# Submission time Handle Problem Language Result Execution time Memory
759138 2023-06-15T19:35:59 Z Blagoj Mecho (IOI09_mecho) C++17
68 / 100
 143 ms 4444 KB 
#include <bits/stdc++.h>
 
using namespace std;
 
#define endl '\n'
#define ll long long
#define all(x) x.begin(), x.end()
 
int n, s, times[802][802];
vector<string> v(802);
pair<int, int> st, en;
 
const int dx[4] = {0, 0, -1, 1};
const int dy[4] = {-1, 1, 0, 0};
 
inline bool valid(int x, int y) {
    return (x >= 0 && x < n && y >= 0 && y < n && v[x][y] != 'T');
}
 
bool check(int m) {
    if (m >= times[st.first][st.second]) return 0;
    queue<pair<int, int>> q;
    q.push(st);
    bool vis[n + 2][n + 2];
    memset(vis, 0, sizeof(vis));
    vis[st.first][st.second] = 1;
    int moves = 0;
    do {
        moves++;
        if (moves >= s) {
            moves = 0;
            m++;
        }
        int sz = q.size();
        while (sz--) {
            int x = q.front().first, y = q.front().second;
            q.pop();
            for (int d = 0; d < 4; d++) {
                int nx = x + dx[d], ny = y + dy[d];
                if (valid(nx, ny) && m < times[nx][ny] && !vis[nx][ny]) {
                    vis[nx][ny] = 1;
                    q.push({nx, ny});
                    if (make_pair(nx, ny) == en) return 1;
                }
            }
        }
    }
    while (q.size() > 0);
    return 0;
}
 
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cin >> n >> s;
    queue<pair<int, int>> h;
 
    for (int i = 0; i < n; i++) {
        cin >> v[i];
        for (int j = 0; j < n; j++) {
            times[i][j] = n * n + 1000;
            if (v[i][j] == 'M') st = {i, j};
            if (v[i][j] == 'H') {
                h.push({i, j});
                times[i][j] = 0;
            }
            if (v[i][j] == 'D') en = {i, j};
        }
    }
 
    while (h.size() > 0) {
        int x = h.front().first, y = h.front().second;
        h.pop();
        for (int d = 0; d < 4; d++) {
            int nx = x + dx[d], ny = y + dy[d];
            if (valid(nx, ny) && times[x][y] + 1 < times[nx][ny]) {
                times[nx][ny] = times[x][y] + 1;
                h.push({nx, ny});
            }
        }
    }
 
    int l = 0, r = n * n + 100, ans;
    while (l <= r) {
        int m = (l + r) / 2;
        if (check(m)) {
            ans = m; 
            l = m + 1;
        }
        else r = m - 1;
    }
 
    cout << ans;
}

Compilation message

mecho.cpp: In function 'int main()':
mecho.cpp:93:13: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
   93 |     cout << ans;
      |             ^~~

Subtask #1
68.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Incorrect 1 ms 340 KB Output isn't correct
3 Correct 1 ms 340 KB Output is correct
4 Incorrect 1 ms 340 KB Output isn't correct
5 Correct 0 ms 340 KB Output is correct
6 Incorrect 1 ms 340 KB Output isn't correct
7 Incorrect 66 ms 4252 KB Output isn't correct
8 Incorrect 0 ms 340 KB Output isn't correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Incorrect 1 ms 468 KB Output isn't correct
13 Correct 1 ms 468 KB Output is correct
14 Incorrect 1 ms 468 KB Output isn't correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 0 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 1 ms 340 KB Output is correct
21 Correct 0 ms 468 KB Output is correct
22 Correct 1 ms 468 KB Output is correct
23 Correct 1 ms 468 KB Output is correct
24 Correct 1 ms 468 KB Output is correct
25 Correct 1 ms 468 KB Output is correct
26 Correct 1 ms 468 KB Output is correct
27 Correct 1 ms 468 KB Output is correct
28 Correct 1 ms 468 KB Output is correct
29 Correct 1 ms 468 KB Output is correct
30 Correct 1 ms 468 KB Output is correct
31 Correct 1 ms 596 KB Output is correct
32 Correct 1 ms 596 KB Output is correct
33 Correct 3 ms 1620 KB Output is correct
34 Correct 2 ms 1620 KB Output is correct
35 Correct 15 ms 1708 KB Output is correct
36 Correct 3 ms 1876 KB Output is correct
37 Correct 3 ms 1876 KB Output is correct
38 Correct 19 ms 1936 KB Output is correct
39 Correct 3 ms 2132 KB Output is correct
40 Correct 3 ms 2132 KB Output is correct
41 Correct 28 ms 2184 KB Output is correct
42 Correct 4 ms 2388 KB Output is correct
43 Correct 4 ms 2388 KB Output is correct
44 Correct 34 ms 2428 KB Output is correct
45 Correct 5 ms 2644 KB Output is correct
46 Correct 4 ms 2644 KB Output is correct
47 Correct 38 ms 2660 KB Output is correct
48 Correct 5 ms 2900 KB Output is correct
49 Correct 5 ms 2900 KB Output is correct
50 Correct 48 ms 2884 KB Output is correct
51 Correct 6 ms 3156 KB Output is correct
52 Correct 6 ms 3156 KB Output is correct
53 Correct 58 ms 3156 KB Output is correct
54 Correct 7 ms 3448 KB Output is correct
55 Correct 7 ms 3540 KB Output is correct
56 Correct 70 ms 3540 KB Output is correct
57 Correct 8 ms 3796 KB Output is correct
58 Correct 8 ms 3796 KB Output is correct
59 Correct 77 ms 3796 KB Output is correct
60 Correct 8 ms 4052 KB Output is correct
61 Correct 8 ms 4048 KB Output is correct
62 Correct 87 ms 4052 KB Output is correct
63 Correct 78 ms 4040 KB Output is correct
64 Correct 143 ms 4052 KB Output is correct
65 Correct 115 ms 4144 KB Output is correct
66 Correct 89 ms 4052 KB Output is correct
67 Incorrect 83 ms 4044 KB Output isn't correct
68 Correct 32 ms 4180 KB Output is correct
69 Correct 32 ms 4076 KB Output is correct
70 Correct 24 ms 4068 KB Output is correct
71 Correct 27 ms 4080 KB Output is correct
72 Correct 19 ms 4180 KB Output is correct
73 Correct 22 ms 4444 KB Output is correct
74 Correct 43 ms 4420 KB Output is correct
75 Correct 53 ms 4420 KB Output is correct
76 Correct 46 ms 4328 KB Output is correct
77 Correct 46 ms 4436 KB Output is correct
78 Incorrect 60 ms 4308 KB Output isn't correct
79 Correct 33 ms 4308 KB Output is correct
80 Correct 44 ms 4296 KB Output is correct
81 Correct 49 ms 4396 KB Output is correct
82 Correct 42 ms 4276 KB Output is correct
83 Correct 68 ms 4384 KB Output is correct
84 Correct 54 ms 4352 KB Output is correct
85 Correct 58 ms 4356 KB Output is correct
86 Correct 61 ms 4356 KB Output is correct
87 Correct 59 ms 4352 KB Output is correct
88 Correct 60 ms 4308 KB Output is correct
89 Correct 79 ms 4304 KB Output is correct
90 Correct 66 ms 4308 KB Output is correct
91 Correct 63 ms 4308 KB Output is correct
92 Correct 73 ms 4200 KB Output is correct