oj.uz

Submission #771014

# Submission time Handle Problem Language Result Execution time Memory
771014 2023-07-02T10:44:33 Z ind1v Mecho (IOI09_mecho) C++11
100 / 100
 157 ms 9484 KB 
#include <bits/stdc++.h>
 
using namespace std;
 
const int N = 805;
const int dI[4] = {-1, 0, +1, 0};
const int dJ[4] = {0, +1, 0, -1};
 
int n, s;
char a[N][N];
long long d[N][N];
int f[N][N];
bool can[N][N];
int mx, my, dx, dy;
 
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  cin >> n >> s;
  memset(d, 0x3f, sizeof(d));
  memset(f, 0x3f, sizeof(f));
  queue<pair<int, int>> q;
  for (int i = 1; i <= n; i++) {
    for (int j = 1; j <= n; j++) {
      cin >> a[i][j];
      if (a[i][j] == 'H') {
        d[i][j] = 0;
        q.push({i, j});
      } else if (a[i][j] == 'M') {
        mx = i;
        my = j;
      } else if (a[i][j] == 'D') {
        dx = i;
        dy = j;
      }
    }
  }
  while (!q.empty()) {
    int x, y;
    tie(x, y) = q.front();
    q.pop();
    for (int dir = 0; dir < 4; dir++) {
      int nx = x + dI[dir];
      int ny = y + dJ[dir];
      if (1 <= nx && nx <= n && 1 <= ny && ny <= n && a[nx][ny] != 'D' && a[nx][ny] != 'T' && d[nx][ny] > d[x][y] + 1) {
        d[nx][ny] = d[x][y] + 1;
        q.push({nx, ny});
      }
    }
  }
  int l = 0, r = n * n, ans = -1;
  while (l <= r) {
    int m = (l + r) >> 1;
    memset(f, 0x3f, sizeof(f));
    memset(can, false, sizeof(can));
    queue<pair<int, int>> q;
    if (m < d[mx][my]) {
      f[mx][my] = 0;
      can[mx][my] = true;
      q.push({mx, my});
    }
    while (!q.empty()) {
      int x, y;
      tie(x, y) = q.front();
      q.pop();
      for (int dir = 0; dir < 4; dir++) {
        int nx = x + dI[dir];
        int ny = y + dJ[dir];
        if (1 <= nx && nx <= n && 1 <= ny && ny <= n && a[nx][ny] != 'T' && f[nx][ny] > f[x][y] + 1 && (f[x][y] + 1) / s + m < d[nx][ny] && !can[nx][ny]) {
          f[nx][ny] = f[x][y] + 1;
          can[nx][ny] = true;
          q.push({nx, ny});
        }
      }
    }
    if (can[dx][dy]) {
      ans = m;
      l = m + 1;
    } else {
      r = m - 1;
    }
  }
  cout << ans;
  return 0;
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 8532 KB Output is correct
2 Correct 4 ms 8532 KB Output is correct
3 Correct 4 ms 8532 KB Output is correct
4 Correct 4 ms 8532 KB Output is correct
5 Correct 4 ms 8532 KB Output is correct
6 Correct 4 ms 8532 KB Output is correct
7 Correct 71 ms 9288 KB Output is correct
8 Correct 4 ms 8532 KB Output is correct
9 Correct 3 ms 8532 KB Output is correct
10 Correct 3 ms 8532 KB Output is correct
11 Correct 4 ms 8532 KB Output is correct
12 Correct 4 ms 8532 KB Output is correct
13 Correct 4 ms 8532 KB Output is correct
14 Correct 4 ms 8532 KB Output is correct
15 Correct 4 ms 8532 KB Output is correct
16 Correct 4 ms 8500 KB Output is correct
17 Correct 4 ms 8532 KB Output is correct
18 Correct 4 ms 8532 KB Output is correct
19 Correct 4 ms 8528 KB Output is correct
20 Correct 4 ms 8532 KB Output is correct
21 Correct 4 ms 8628 KB Output is correct
22 Correct 5 ms 8660 KB Output is correct
23 Correct 4 ms 8532 KB Output is correct
24 Correct 4 ms 8532 KB Output is correct
25 Correct 5 ms 8616 KB Output is correct
26 Correct 4 ms 8532 KB Output is correct
27 Correct 4 ms 8532 KB Output is correct
28 Correct 4 ms 8532 KB Output is correct
29 Correct 4 ms 8620 KB Output is correct
30 Correct 5 ms 8532 KB Output is correct
31 Correct 4 ms 8532 KB Output is correct
32 Correct 4 ms 8532 KB Output is correct
33 Correct 7 ms 8848 KB Output is correct
34 Correct 7 ms 8788 KB Output is correct
35 Correct 21 ms 8788 KB Output is correct
36 Correct 8 ms 8788 KB Output is correct
37 Correct 8 ms 8788 KB Output is correct
38 Correct 25 ms 8788 KB Output is correct
39 Correct 11 ms 8916 KB Output is correct
40 Correct 11 ms 8916 KB Output is correct
41 Correct 33 ms 8920 KB Output is correct
42 Correct 10 ms 8916 KB Output is correct
43 Correct 11 ms 8916 KB Output is correct
44 Correct 39 ms 8952 KB Output is correct
45 Correct 14 ms 8916 KB Output is correct
46 Correct 12 ms 8916 KB Output is correct
47 Correct 54 ms 8976 KB Output is correct
48 Correct 13 ms 8968 KB Output is correct
49 Correct 13 ms 9044 KB Output is correct
50 Correct 52 ms 8932 KB Output is correct
51 Correct 15 ms 8968 KB Output is correct
52 Correct 15 ms 8968 KB Output is correct
53 Correct 71 ms 9108 KB Output is correct
54 Correct 18 ms 9100 KB Output is correct
55 Correct 16 ms 9004 KB Output is correct
56 Correct 75 ms 9112 KB Output is correct
57 Correct 18 ms 9080 KB Output is correct
58 Correct 23 ms 9044 KB Output is correct
59 Correct 85 ms 9052 KB Output is correct
60 Correct 20 ms 9084 KB Output is correct
61 Correct 20 ms 9136 KB Output is correct
62 Correct 97 ms 9152 KB Output is correct
63 Correct 85 ms 9184 KB Output is correct
64 Correct 157 ms 9184 KB Output is correct
65 Correct 117 ms 9172 KB Output is correct
66 Correct 97 ms 9172 KB Output is correct
67 Correct 93 ms 9188 KB Output is correct
68 Correct 40 ms 9108 KB Output is correct
69 Correct 39 ms 9172 KB Output is correct
70 Correct 30 ms 9112 KB Output is correct
71 Correct 36 ms 9104 KB Output is correct
72 Correct 27 ms 9164 KB Output is correct
73 Correct 29 ms 9484 KB Output is correct
74 Correct 48 ms 9472 KB Output is correct
75 Correct 62 ms 9452 KB Output is correct
76 Correct 53 ms 9464 KB Output is correct
77 Correct 49 ms 9356 KB Output is correct
78 Correct 62 ms 9420 KB Output is correct
79 Correct 43 ms 9324 KB Output is correct
80 Correct 49 ms 9440 KB Output is correct
81 Correct 58 ms 9444 KB Output is correct
82 Correct 54 ms 9448 KB Output is correct
83 Correct 73 ms 9396 KB Output is correct
84 Correct 57 ms 9396 KB Output is correct
85 Correct 63 ms 9396 KB Output is correct
86 Correct 60 ms 9292 KB Output is correct
87 Correct 76 ms 9396 KB Output is correct
88 Correct 64 ms 9348 KB Output is correct
89 Correct 65 ms 9348 KB Output is correct
90 Correct 77 ms 9300 KB Output is correct
91 Correct 72 ms 9364 KB Output is correct
92 Correct 75 ms 9244 KB Output is correct