oj.uz

Submission #495680

# Submission time Handle Problem Language Result Execution time Memory
495680 2021-12-20T01:35:52 Z chenwz Mecho (IOI09_mecho) C++14
100 / 100
 229 ms 22436 KB 
#include <bits/stdc++.h>
using namespace std;
const int NN = 2000 + 4, DX[4] = {1, -1, 0, 0}, DY[4] = {0, 0, 1, -1};
#define _for(i, a, b) for (int i = (a); i < (int)(b); ++i)
char G[NN][NN];
int N, S, B[NN][NN];
bool Vis[NN][NN];
struct Point {
  int x, y;
};
bool check(const Point& st, int delay) {
  if (delay * S >= B[st.x][st.y]) return false;
  memset(Vis, 0, sizeof(Vis));
  queue<pair<int, Point> > Q;
  Q.push({delay * S, st}), Vis[st.x][st.y] = true;
  while (!Q.empty()) {
    auto p = Q.front();
    Q.pop();
    int d = p.first, x = p.second.x, y = p.second.y;
    if (G[x][y] == 'D') return true;
    _for(i, 0, 4) {
      int nx = x + DX[i], ny = y + DY[i];
      if (nx < 0 || nx >= N || ny < 0 || ny >= N || G[nx][ny] == 'T' ||
          (d + 1) >= B[nx][ny] || Vis[nx][ny])
        continue;
      Q.push({d + 1, {nx, ny}}), Vis[nx][ny] = true;
    }
  }
  return false;
}
int main() {
  cin >> N >> S;
  queue<Point> Q;
  Point Honey, Home;
  memset(B, -1, sizeof(B));
  _for(i, 0, N) {
    cin >> ws;
    _for(j, 0, N) {
      char& c = G[i][j];
      cin >> c;
      if (c == 'H') Q.push({i, j}), B[i][j] = 0;
      if (c == 'M') Honey = {i, j}, c = 'G';
      if (c == 'D') Home = {i, j};
    }
  }
  while (!Q.empty()) {
    Point p = Q.front();
    Q.pop();
    _for(i, 0, 4) {
      Point np{p.x + DX[i], p.y + DY[i]};
      if (np.x < 0 || np.x >= N || np.y < 0 || np.y >= N ||
          G[np.x][np.y] != 'G' || B[np.x][np.y] != -1)
        continue;
      B[np.x][np.y] = B[p.x][p.y] + S, Q.push({np.x, np.y});
    }
  }
  B[Home.x][Home.y] = N * N * S;
  int L = -1, R = 2 * N * N;
  while (L + 1 < R) {
    int mid = (L + R) / 2;
    (check(Honey, mid) ? L : R) = mid;
  }
  cout << L << endl;
  return 0;
}

Compilation message

mecho.cpp: In function 'int main()':
mecho.cpp:57:21: warning: 'Home.Point::x' may be used uninitialized in this function [-Wmaybe-uninitialized]
   57 |   B[Home.x][Home.y] = N * N * S;
      |   ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~
mecho.cpp:57:21: warning: 'Home.Point::y' may be used uninitialized in this function [-Wmaybe-uninitialized]

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 19916 KB Output is correct
2 Correct 9 ms 19880 KB Output is correct
3 Correct 9 ms 19856 KB Output is correct
4 Correct 9 ms 19880 KB Output is correct
5 Correct 9 ms 19968 KB Output is correct
6 Correct 9 ms 19916 KB Output is correct
7 Correct 112 ms 22280 KB Output is correct
8 Correct 8 ms 19916 KB Output is correct
9 Correct 8 ms 19884 KB Output is correct
10 Correct 9 ms 19916 KB Output is correct
11 Correct 9 ms 19880 KB Output is correct
12 Correct 9 ms 20056 KB Output is correct
13 Correct 9 ms 19984 KB Output is correct
14 Correct 9 ms 20064 KB Output is correct
15 Correct 9 ms 19904 KB Output is correct
16 Correct 9 ms 20044 KB Output is correct
17 Correct 10 ms 19916 KB Output is correct
18 Correct 9 ms 19916 KB Output is correct
19 Correct 10 ms 19916 KB Output is correct
20 Correct 9 ms 19888 KB Output is correct
21 Correct 12 ms 20008 KB Output is correct
22 Correct 9 ms 19916 KB Output is correct
23 Correct 9 ms 20044 KB Output is correct
24 Correct 10 ms 20036 KB Output is correct
25 Correct 9 ms 19960 KB Output is correct
26 Correct 10 ms 20044 KB Output is correct
27 Correct 12 ms 20044 KB Output is correct
28 Correct 10 ms 20044 KB Output is correct
29 Correct 11 ms 20044 KB Output is correct
30 Correct 10 ms 20044 KB Output is correct
31 Correct 11 ms 20104 KB Output is correct
32 Correct 10 ms 20044 KB Output is correct
33 Correct 18 ms 20664 KB Output is correct
34 Correct 19 ms 20676 KB Output is correct
35 Correct 37 ms 20736 KB Output is correct
36 Correct 21 ms 20784 KB Output is correct
37 Correct 21 ms 20864 KB Output is correct
38 Correct 38 ms 20840 KB Output is correct
39 Correct 24 ms 20904 KB Output is correct
40 Correct 24 ms 20932 KB Output is correct
41 Correct 51 ms 21020 KB Output is correct
42 Correct 26 ms 21040 KB Output is correct
43 Correct 26 ms 21060 KB Output is correct
44 Correct 65 ms 21060 KB Output is correct
45 Correct 31 ms 21288 KB Output is correct
46 Correct 31 ms 21264 KB Output is correct
47 Correct 66 ms 21316 KB Output is correct
48 Correct 36 ms 21444 KB Output is correct
49 Correct 33 ms 21444 KB Output is correct
50 Correct 82 ms 21432 KB Output is correct
51 Correct 38 ms 21572 KB Output is correct
52 Correct 36 ms 21548 KB Output is correct
53 Correct 92 ms 21556 KB Output is correct
54 Correct 43 ms 21756 KB Output is correct
55 Correct 46 ms 21844 KB Output is correct
56 Correct 116 ms 21788 KB Output is correct
57 Correct 49 ms 21864 KB Output is correct
58 Correct 47 ms 21936 KB Output is correct
59 Correct 134 ms 21916 KB Output is correct
60 Correct 55 ms 22244 KB Output is correct
61 Correct 51 ms 22048 KB Output is correct
62 Correct 139 ms 22048 KB Output is correct
63 Correct 135 ms 22088 KB Output is correct
64 Correct 229 ms 22148 KB Output is correct
65 Correct 186 ms 22172 KB Output is correct
66 Correct 142 ms 22044 KB Output is correct
67 Correct 157 ms 22016 KB Output is correct
68 Correct 85 ms 22100 KB Output is correct
69 Correct 86 ms 22128 KB Output is correct
70 Correct 69 ms 22072 KB Output is correct
71 Correct 78 ms 22044 KB Output is correct
72 Correct 61 ms 22084 KB Output is correct
73 Correct 64 ms 22316 KB Output is correct
74 Correct 94 ms 22308 KB Output is correct
75 Correct 93 ms 22316 KB Output is correct
76 Correct 89 ms 22356 KB Output is correct
77 Correct 88 ms 22340 KB Output is correct
78 Correct 111 ms 22428 KB Output is correct
79 Correct 80 ms 22340 KB Output is correct
80 Correct 93 ms 22376 KB Output is correct
81 Correct 96 ms 22340 KB Output is correct
82 Correct 93 ms 22436 KB Output is correct
83 Correct 111 ms 22272 KB Output is correct
84 Correct 95 ms 22340 KB Output is correct
85 Correct 101 ms 22216 KB Output is correct
86 Correct 101 ms 22336 KB Output is correct
87 Correct 101 ms 22320 KB Output is correct
88 Correct 104 ms 22212 KB Output is correct
89 Correct 111 ms 22212 KB Output is correct
90 Correct 119 ms 22340 KB Output is correct
91 Correct 110 ms 22180 KB Output is correct
92 Correct 115 ms 22244 KB Output is correct