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Submission #607762

# Submission time Handle Problem Language Result Execution time Memory
607762 2022-07-27T03:19:38 Z EthanKim8683 Mecho (IOI09_mecho) C++17
100 / 100
 227 ms 11520 KB 
#include <iostream>
#include <cstdio>
#include <queue>
#include <stack>
#include <tuple>
#include <algorithm>

using namespace std;

using I = int;
using C = char;
using B = bool;

const I N = 800;

C cels[N][N];
B tres[N][N];
B bees[N][N];
B viss[N][N];
queue<tuple<I, I, I>> bee_que;
stack<tuple<I, I, I>> rem_stk;
stack<tuple<I, I, I>> add_stk;
queue<tuple<I, I, I, I>> mec_que;
I n, s;
I mi, mj;
I di, dj;

B bnd(I i, I j) {
  return i >= 0 && i < n && j >= 0 && j < n;
}

void bee_vis(I i, I j, I tim) {
  if (!bnd(i, j))
    return;
  if (tres[i][j] || bees[i][j])
    return;
  if (i == di && j == dj)
    return;
  bees[i][j] = true;
  bee_que.push({i, j, tim});
  rem_stk.push({i, j, tim});
}

B mec_vis(I i, I j, I tim, I mid) {
  if (!bnd(i, j))
    return false;
  if (tres[i][j] || bees[i][j] || viss[i][j])
    return false;
  if (i == di && j == dj)
    return true;
  viss[i][j] = true;
  mec_que.push({i, j, tim + mid / s, mid % s});
  return false;
}

void set(I cur) {
  while (!rem_stk.empty()) {
    const auto [i, j, tim] = rem_stk.top();
    if (tim <= cur)
      break;
    rem_stk.pop();
    bees[i][j] = false;
    add_stk.push({i, j, tim});
  }
  while (!add_stk.empty()) {
    const auto [i, j, tim] = add_stk.top();
    if (tim > cur)
      break;
    add_stk.pop();
    bees[i][j] = true;
    rem_stk.push({i, j, tim});
  }
}

void fil() {
  while (!bee_que.empty()) {
    const auto [i, j, tim] = bee_que.front();
    bee_que.pop();
    bee_vis(i - 1, j, tim + 1);
    bee_vis(i + 1, j, tim + 1);
    bee_vis(i, j - 1, tim + 1);
    bee_vis(i, j + 1, tim + 1);
  }
}

B tes(I cur) {
  fill(&viss[0][0], &viss[0][0] + sizeof(viss) / sizeof(B), false);
  while (!mec_que.empty())
    mec_que.pop();
  set(cur);
  mec_vis(mi, mj, cur, 0);
  while (!mec_que.empty()) {
    const auto [i, j, tim, mid] = mec_que.front();
    mec_que.pop();
    if (cur != tim) {
      cur = tim;
      set(cur);
    }
    if (bees[i][j])
      continue;
    if (mec_vis(i - 1, j, tim, mid + 1))
      return true;
    if (mec_vis(i + 1, j, tim, mid + 1))
      return true;
    if (mec_vis(i, j - 1, tim, mid + 1))
      return true;
    if (mec_vis(i, j + 1, tim, mid + 1))
      return true;
  }
  return false;
}

I slv() {
  fil();
  I l = -1;
  I r = get<2>(rem_stk.top());
  while (l < r) {
    const I m = l + (r - l + 1) / 2;
    if (tes(m))
      l = m;
    else
      r = m - 1;
  }
  return l;
}

I main(void) {
  cin.tie(0)->sync_with_stdio(0);
  cin >> n >> s;
  for (I i = 0; i < n; i++)
    cin >> cels[i];
  for (I i = 0; i < n; i++) {
    for (I j = 0; j < n; j++) {
      const C cel = cels[i][j];
      if (cel == 'T')
        tres[i][j] = true;
      else if (cel == 'M') {
        mi = i;
        mj = j;
      } else if (cel == 'D') {
        di = i;
        dj = j;
      } else if (cel == 'H')
        bee_vis(i, j, 0);
    }
  }
  printf("%i\n", slv());
  return 0;
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 852 KB Output is correct
2 Correct 1 ms 852 KB Output is correct
3 Correct 1 ms 852 KB Output is correct
4 Correct 1 ms 852 KB Output is correct
5 Correct 1 ms 980 KB Output is correct
6 Correct 1 ms 980 KB Output is correct
7 Correct 113 ms 11420 KB Output is correct
8 Correct 1 ms 980 KB Output is correct
9 Correct 1 ms 980 KB Output is correct
10 Correct 1 ms 968 KB Output is correct
11 Correct 1 ms 980 KB Output is correct
12 Correct 2 ms 1108 KB Output is correct
13 Correct 2 ms 1108 KB Output is correct
14 Correct 2 ms 1108 KB Output is correct
15 Correct 1 ms 980 KB Output is correct
16 Correct 1 ms 980 KB Output is correct
17 Correct 1 ms 976 KB Output is correct
18 Correct 1 ms 980 KB Output is correct
19 Correct 1 ms 980 KB Output is correct
20 Correct 1 ms 972 KB Output is correct
21 Correct 1 ms 980 KB Output is correct
22 Correct 1 ms 972 KB Output is correct
23 Correct 1 ms 980 KB Output is correct
24 Correct 1 ms 1108 KB Output is correct
25 Correct 1 ms 1108 KB Output is correct
26 Correct 1 ms 1100 KB Output is correct
27 Correct 1 ms 1108 KB Output is correct
28 Correct 1 ms 1108 KB Output is correct
29 Correct 1 ms 1108 KB Output is correct
30 Correct 2 ms 1108 KB Output is correct
31 Correct 1 ms 1108 KB Output is correct
32 Correct 1 ms 1100 KB Output is correct
33 Correct 4 ms 2644 KB Output is correct
34 Correct 5 ms 2644 KB Output is correct
35 Correct 22 ms 3028 KB Output is correct
36 Correct 6 ms 3028 KB Output is correct
37 Correct 5 ms 3032 KB Output is correct
38 Correct 30 ms 3524 KB Output is correct
39 Correct 7 ms 3412 KB Output is correct
40 Correct 7 ms 3540 KB Output is correct
41 Correct 40 ms 4140 KB Output is correct
42 Correct 7 ms 3924 KB Output is correct
43 Correct 9 ms 3948 KB Output is correct
44 Correct 46 ms 4736 KB Output is correct
45 Correct 10 ms 4456 KB Output is correct
46 Correct 10 ms 4436 KB Output is correct
47 Correct 59 ms 5392 KB Output is correct
48 Correct 13 ms 4972 KB Output is correct
49 Correct 12 ms 4976 KB Output is correct
50 Correct 71 ms 6212 KB Output is correct
51 Correct 12 ms 5488 KB Output is correct
52 Correct 13 ms 5504 KB Output is correct
53 Correct 84 ms 6904 KB Output is correct
54 Correct 16 ms 6072 KB Output is correct
55 Correct 17 ms 6076 KB Output is correct
56 Correct 101 ms 7628 KB Output is correct
57 Correct 15 ms 6652 KB Output is correct
58 Correct 16 ms 6740 KB Output is correct
59 Correct 105 ms 8556 KB Output is correct
60 Correct 18 ms 7356 KB Output is correct
61 Correct 19 ms 7348 KB Output is correct
62 Correct 134 ms 9568 KB Output is correct
63 Correct 142 ms 8272 KB Output is correct
64 Correct 178 ms 8272 KB Output is correct
65 Correct 227 ms 8228 KB Output is correct
66 Correct 158 ms 8208 KB Output is correct
67 Correct 143 ms 8260 KB Output is correct
68 Correct 95 ms 8248 KB Output is correct
69 Correct 44 ms 8160 KB Output is correct
70 Correct 67 ms 8268 KB Output is correct
71 Correct 59 ms 8276 KB Output is correct
72 Correct 38 ms 8100 KB Output is correct
73 Correct 62 ms 11444 KB Output is correct
74 Correct 104 ms 11228 KB Output is correct
75 Correct 102 ms 11204 KB Output is correct
76 Correct 118 ms 11232 KB Output is correct
77 Correct 79 ms 11228 KB Output is correct
78 Correct 121 ms 11520 KB Output is correct
79 Correct 65 ms 11216 KB Output is correct
80 Correct 83 ms 11280 KB Output is correct
81 Correct 100 ms 11356 KB Output is correct
82 Correct 76 ms 11228 KB Output is correct
83 Correct 137 ms 11416 KB Output is correct
84 Correct 80 ms 11184 KB Output is correct
85 Correct 79 ms 11164 KB Output is correct
86 Correct 95 ms 11328 KB Output is correct
87 Correct 114 ms 11212 KB Output is correct
88 Correct 141 ms 11484 KB Output is correct
89 Correct 101 ms 11264 KB Output is correct
90 Correct 100 ms 11272 KB Output is correct
91 Correct 93 ms 11264 KB Output is correct
92 Correct 137 ms 11492 KB Output is correct