oj.uz

Submission #950866

# Submission time Handle Problem Language Result Execution time Memory
950866 2024-03-20T20:52:52 Z blackslex Mecho (IOI09_mecho) C++17
64 / 100
 185 ms 6492 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') 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 = 1e5;
    while (l <= r) {
        int mid = (l + r) >> 1;
        if (bs(mid)) l = mid + 1;
        else r = mid - 1;
    }
    if (bs(0)) printf("%d", r);
    else printf("-1");
}

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
64.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 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 344 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 117 ms 6472 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 344 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 1 ms 348 KB Output is correct
17 Correct 1 ms 448 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 1 ms 348 KB Output is correct
20 Correct 1 ms 344 KB Output is correct
21 Correct 0 ms 344 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 1 ms 344 KB Output is correct
25 Correct 1 ms 348 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 1 ms 348 KB Output is correct
33 Correct 6 ms 1664 KB Output is correct
34 Correct 7 ms 1628 KB Output is correct
35 Correct 26 ms 1628 KB Output is correct
36 Correct 7 ms 2204 KB Output is correct
37 Correct 8 ms 1884 KB Output is correct
38 Correct 37 ms 2008 KB Output is correct
39 Incorrect 9 ms 2392 KB Output isn't correct
40 Correct 11 ms 2396 KB Output is correct
41 Correct 49 ms 2408 KB Output is correct
42 Incorrect 15 ms 2856 KB Output isn't correct
43 Correct 14 ms 2652 KB Output is correct
44 Correct 63 ms 2652 KB Output is correct
45 Incorrect 20 ms 3164 KB Output isn't correct
46 Correct 15 ms 3348 KB Output is correct
47 Correct 82 ms 3352 KB Output is correct
48 Incorrect 27 ms 3888 KB Output isn't correct
49 Correct 26 ms 3764 KB Output is correct
50 Correct 88 ms 3884 KB Output is correct
51 Incorrect 36 ms 4324 KB Output isn't correct
52 Incorrect 24 ms 4444 KB Output isn't correct
53 Correct 102 ms 4468 KB Output is correct
54 Incorrect 41 ms 4956 KB Output isn't correct
55 Incorrect 37 ms 4956 KB Output isn't correct
56 Correct 120 ms 5100 KB Output is correct
57 Incorrect 48 ms 5724 KB Output isn't correct
58 Incorrect 50 ms 5748 KB Output isn't correct
59 Correct 132 ms 5720 KB Output is correct
60 Incorrect 59 ms 6464 KB Output isn't correct
61 Incorrect 64 ms 6264 KB Output isn't correct
62 Correct 167 ms 6460 KB Output is correct
63 Correct 121 ms 6448 KB Output is correct
64 Correct 185 ms 6228 KB Output is correct
65 Correct 176 ms 6452 KB Output is correct
66 Correct 151 ms 6232 KB Output is correct
67 Correct 132 ms 6224 KB Output is correct
68 Correct 55 ms 6280 KB Output is correct
69 Correct 46 ms 6224 KB Output is correct
70 Correct 45 ms 6232 KB Output is correct
71 Correct 43 ms 6224 KB Output is correct
72 Incorrect 44 ms 6472 KB Output isn't correct
73 Incorrect 47 ms 6480 KB Output isn't correct
74 Correct 95 ms 6472 KB Output is correct
75 Correct 98 ms 6472 KB Output is correct
76 Correct 76 ms 6468 KB Output is correct
77 Correct 95 ms 6476 KB Output is correct
78 Correct 109 ms 6484 KB Output is correct
79 Correct 87 ms 6480 KB Output is correct
80 Correct 78 ms 6484 KB Output is correct
81 Correct 97 ms 6492 KB Output is correct
82 Correct 81 ms 6480 KB Output is correct
83 Correct 108 ms 6476 KB Output is correct
84 Correct 118 ms 6476 KB Output is correct
85 Correct 101 ms 6236 KB Output is correct
86 Correct 96 ms 6284 KB Output is correct
87 Correct 96 ms 6492 KB Output is correct
88 Correct 122 ms 6460 KB Output is correct
89 Correct 114 ms 6472 KB Output is correct
90 Correct 106 ms 6484 KB Output is correct
91 Correct 108 ms 6480 KB Output is correct
92 Correct 110 ms 6480 KB Output is correct