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Submission #950873

# Submission time Handle Problem Language Result Execution time Memory
950873 2024-03-20T21:01:54 Z blackslex Mecho (IOI09_mecho) C++17
84 / 100
 160 ms 6708 KB 
#include<bits/stdc++.h>

using namespace std;
using pii = pair<int, int>;
using tp = tuple<int, int, int>;

const int cd[4][2] = {{0, 1}, {0, -1}, {-1, 0}, {1, 0}};
int n, s, sx, sy, tx, ty;

int main() {
    scanf("%d %d", &n, &s);
    vector<string> c(n + 5);
    for (int i = 1; i <= n; i++) cin >> c[i], c[i] = " " + c[i];
    queue<pii> q;
    vector<vector<int>> d(n + 5, vector<int>(n + 5, 1e9));
    vector<vector<bool>> f(n + 5, vector<bool>(n + 5));
    for (int i = 1; i <= n; i++) for (int j = 1; j <= n; j++) if (c[i][j] == 'M') sx = i, sy = j; else if (c[i][j] == 'H') d[i][j] = 1, q.emplace(i, j); else if (c[i][j] == 'D') tx = i, ty = j;
    while (!q.empty()) {
        auto [x, y] = q.front(); q.pop();
        if (f[x][y]) continue; f[x][y] = 1;
        for (int i = 0; i < 4; i++) {
            int nx = x + cd[i][0], ny = y + cd[i][1];
            if (nx <= 0 || nx > n || ny <= 0 || ny > n || c[nx][ny] == 'T' || c[nx][ny] == 'D') continue;
            if (d[nx][ny] > d[x][y] + 1) d[nx][ny] = d[x][y] + 1, q.emplace(nx, ny);
        }
    }
    auto bs = [&] (int val) {
        vector<vector<int>> d2(n + 5, vector<int>(n + 5, 1e9));
        vector<vector<bool>> f2(n + 5, vector<bool>(n + 5));
        queue<tp> cq; d2[sx][sy] = val + 1; cq.emplace(sx, sy, 0);
        while (!cq.empty()) {
            auto [x, y, t] = cq.front(); cq.pop();
            if (f2[x][y]) continue; f2[x][y] = 1;
            int nt = t + 1, nts = (t + 1) % s;
            for (int i = 0; i < 4; i++) {
                int nx = x + cd[i][0], ny = y + cd[i][1];
                if (nx <= 0 || nx > n || ny <= 0 || ny > n || c[nx][ny] == 'T') continue;
                if (!nts) d2[nx][ny] = d2[x][y] + 1;
                else d2[nx][ny] = d2[x][y];
                if (d2[nx][ny] < d[nx][ny]) cq.emplace(nx, ny, nt);
            }
        }
        return d2[tx][ty] != 1e9;
    };
    int l = 0, r = 1e6;
    while (l <= r) {
        int mid = (l + r) >> 1;
        if (bs(mid)) l = mid + 1;
        else r = mid - 1;
    }
    printf("%d", r);
}

Compilation message

mecho.cpp: In function 'int main()':
mecho.cpp:20:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   20 |         if (f[x][y]) continue; f[x][y] = 1;
      |         ^~
mecho.cpp:20:32: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   20 |         if (f[x][y]) continue; f[x][y] = 1;
      |                                ^
mecho.cpp: In lambda function:
mecho.cpp:33:13: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   33 |             if (f2[x][y]) continue; f2[x][y] = 1;
      |             ^~
mecho.cpp:33:37: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   33 |             if (f2[x][y]) continue; f2[x][y] = 1;
      |                                     ^~
mecho.cpp: In function 'int main()':
mecho.cpp:11:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 |     scanf("%d %d", &n, &s);
      |     ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
84.0 / 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 1 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 112 ms 6480 KB Output is correct
8 Correct 1 ms 344 KB Output is correct
9 Correct 1 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 1 ms 348 KB Output isn't correct
13 Incorrect 1 ms 348 KB Output isn't correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 1 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 1 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 1 ms 348 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 344 KB Output is correct
24 Correct 1 ms 348 KB Output is correct
25 Correct 1 ms 504 KB Output is correct
26 Correct 1 ms 348 KB Output is correct
27 Correct 1 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 2 ms 348 KB Output is correct
33 Correct 5 ms 1624 KB Output is correct
34 Correct 6 ms 1628 KB Output is correct
35 Correct 24 ms 1672 KB Output is correct
36 Correct 6 ms 1880 KB Output is correct
37 Correct 6 ms 1884 KB Output is correct
38 Correct 30 ms 1880 KB Output is correct
39 Correct 8 ms 2396 KB Output is correct
40 Correct 8 ms 2420 KB Output is correct
41 Correct 39 ms 2396 KB Output is correct
42 Correct 10 ms 2652 KB Output is correct
43 Correct 11 ms 2648 KB Output is correct
44 Correct 57 ms 2860 KB Output is correct
45 Correct 11 ms 3164 KB Output is correct
46 Correct 12 ms 3296 KB Output is correct
47 Correct 61 ms 3160 KB Output is correct
48 Correct 12 ms 3672 KB Output is correct
49 Correct 13 ms 3676 KB Output is correct
50 Correct 72 ms 3676 KB Output is correct
51 Correct 14 ms 4440 KB Output is correct
52 Correct 15 ms 4444 KB Output is correct
53 Correct 83 ms 4468 KB Output is correct
54 Correct 18 ms 4956 KB Output is correct
55 Correct 19 ms 5068 KB Output is correct
56 Correct 101 ms 5116 KB Output is correct
57 Correct 18 ms 5724 KB Output is correct
58 Correct 19 ms 5728 KB Output is correct
59 Correct 114 ms 5768 KB Output is correct
60 Correct 23 ms 6232 KB Output is correct
61 Correct 21 ms 6228 KB Output is correct
62 Correct 128 ms 6236 KB Output is correct
63 Correct 117 ms 6708 KB Output is correct
64 Correct 160 ms 6316 KB Output is correct
65 Correct 152 ms 6336 KB Output is correct
66 Correct 152 ms 6456 KB Output is correct
67 Correct 106 ms 6348 KB Output is correct
68 Correct 49 ms 6236 KB Output is correct
69 Correct 48 ms 6232 KB Output is correct
70 Correct 44 ms 6232 KB Output is correct
71 Correct 37 ms 6356 KB Output is correct
72 Incorrect 39 ms 6480 KB Output isn't correct
73 Incorrect 44 ms 6492 KB Output isn't correct
74 Correct 69 ms 6464 KB Output is correct
75 Correct 87 ms 6480 KB Output is correct
76 Correct 70 ms 6372 KB Output is correct
77 Correct 78 ms 6492 KB Output is correct
78 Correct 83 ms 6480 KB Output is correct
79 Correct 69 ms 6472 KB Output is correct
80 Correct 70 ms 6236 KB Output is correct
81 Correct 81 ms 6340 KB Output is correct
82 Correct 65 ms 6476 KB Output is correct
83 Correct 90 ms 6528 KB Output is correct
84 Correct 81 ms 6484 KB Output is correct
85 Correct 85 ms 6492 KB Output is correct
86 Correct 94 ms 6228 KB Output is correct
87 Correct 85 ms 6296 KB Output is correct
88 Correct 98 ms 6472 KB Output is correct
89 Correct 94 ms 6336 KB Output is correct
90 Correct 99 ms 6468 KB Output is correct
91 Correct 110 ms 6476 KB Output is correct
92 Correct 96 ms 6232 KB Output is correct