oj.uz

Submission #767740

# Submission time Handle Problem Language Result Execution time Memory
767740 2023-06-27T06:26:59 Z mgl_diamond Mecho (IOI09_mecho) C++14
100 / 100
 398 ms 4408 KB 
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ii = pair<int, int>;
using il = pair<ll, ll>;

#define foru(i, l, r) for(int i=(l); i<=(r); ++i)
#define ford(i, l, r) for(int i=(l); i>=(r); --i)
#define fore(x, v) for(auto &x : v)
#define all(x) (x).begin(), (x).end()
#define fi first
#define se second

void setIO(string name) {
  ios::sync_with_stdio(0);
  cin.tie(0); cout.tie(0);
  if (!name.empty()) {
    freopen((name + ".in").c_str(), "r", stdin);
    freopen((name + ".out").c_str(), "w", stdout);
  }
}

const int dx[] = {0, 0, -1, 1}, dy[] = {-1, 1, 0, 0};
const int LIM = 1e9;
const int N = 808;

int n, s, vi[N][N];
ii st, en;
vector<ii> hives;
char a[N][N];

bool e(int i, int j) { return i >= 1 && i <= n && j >= 1 && j <= n; }

void propaganda(vector<ii> &lst, int xet, int dis) {
  queue<pair<ii, int>> bfs;
  for(auto x : lst) bfs.push({x, 0});
  lst.clear();
  
  while (!bfs.empty()) {
    auto at = bfs.front(); bfs.pop();
    int x = at.fi.fi, y = at.fi.se;

    if (vi[x][y] == 2 && xet == 1) {
      continue;
    }

    if (at.se == dis) {
      lst.emplace_back(at.fi);
      continue;
    }

    foru(d, 0, 3) {
      int nx = x+dx[d], ny = y+dy[d];
      if (!e(nx, ny) || a[nx][ny] == 'T') continue;
      if (xet == 2 && a[nx][ny] == 'D') continue;
      if (vi[nx][ny] != 0) {
        if (xet == 1) continue;
        if (vi[nx][ny] == 2) continue; 
      }
      vi[nx][ny] = xet;
      bfs.push({{nx, ny}, at.se+1});
    }
  }
}

void out() {
  foru(i, 1, n) {
    foru(j, 1, n) cout << vi[i][j] << " ";
    cout << "\n";
  }
  cout << "---------\n";
}

bool can(int eat_time) {
  memset(vi, 0, sizeof(vi));
  vector<ii> me, bees;
  me.emplace_back(st);
  bees = hives;
  propaganda(bees, 2, eat_time);
  while (!me.empty()) {
    propaganda(me, 1, s);
    propaganda(bees, 2, 1);
  }
  return vi[en.fi][en.se] == 1;
}

int main() {
  setIO("");

  cin >> n >> s;
  foru(i, 1, n)
    foru(j, 1, n) {
      cin >> a[i][j];
      if (a[i][j] == 'M') st = {i, j};
      else if (a[i][j] == 'D') en = {i, j};
      else if (a[i][j] == 'H') hives.emplace_back(i, j);
    }

  int ans = -1;
  for(int z=n*n; z>0; z>>=1) 
    while (ans+z <= n*n && can(ans+z))
      ans += z;
  
  cout << ans;
}

Compilation message

mecho.cpp: In function 'void setIO(std::string)':
mecho.cpp:18:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |     freopen((name + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mecho.cpp:19:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |     freopen((name + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2772 KB Output is correct
2 Correct 2 ms 2772 KB Output is correct
3 Correct 2 ms 2772 KB Output is correct
4 Correct 2 ms 2772 KB Output is correct
5 Correct 1 ms 2772 KB Output is correct
6 Correct 2 ms 2772 KB Output is correct
7 Correct 330 ms 3856 KB Output is correct
8 Correct 2 ms 2772 KB Output is correct
9 Correct 2 ms 2772 KB Output is correct
10 Correct 2 ms 2772 KB Output is correct
11 Correct 2 ms 2772 KB Output is correct
12 Correct 2 ms 2900 KB Output is correct
13 Correct 2 ms 2932 KB Output is correct
14 Correct 3 ms 2900 KB Output is correct
15 Correct 2 ms 2772 KB Output is correct
16 Correct 2 ms 2900 KB Output is correct
17 Correct 2 ms 2900 KB Output is correct
18 Correct 2 ms 2900 KB Output is correct
19 Correct 2 ms 2900 KB Output is correct
20 Correct 2 ms 2900 KB Output is correct
21 Correct 2 ms 2900 KB Output is correct
22 Correct 2 ms 2900 KB Output is correct
23 Correct 3 ms 2900 KB Output is correct
24 Correct 2 ms 2900 KB Output is correct
25 Correct 3 ms 2900 KB Output is correct
26 Correct 3 ms 2900 KB Output is correct
27 Correct 3 ms 2900 KB Output is correct
28 Correct 3 ms 2900 KB Output is correct
29 Correct 3 ms 2900 KB Output is correct
30 Correct 3 ms 2900 KB Output is correct
31 Correct 3 ms 2944 KB Output is correct
32 Correct 3 ms 2900 KB Output is correct
33 Correct 34 ms 3160 KB Output is correct
34 Correct 27 ms 3028 KB Output is correct
35 Correct 35 ms 3168 KB Output is correct
36 Correct 47 ms 3180 KB Output is correct
37 Correct 35 ms 3156 KB Output is correct
38 Correct 45 ms 3208 KB Output is correct
39 Correct 58 ms 3156 KB Output is correct
40 Correct 43 ms 3156 KB Output is correct
41 Correct 58 ms 3248 KB Output is correct
42 Correct 79 ms 3256 KB Output is correct
43 Correct 58 ms 3156 KB Output is correct
44 Correct 84 ms 3276 KB Output is correct
45 Correct 87 ms 3296 KB Output is correct
46 Correct 71 ms 3284 KB Output is correct
47 Correct 85 ms 3284 KB Output is correct
48 Correct 106 ms 3284 KB Output is correct
49 Correct 78 ms 3348 KB Output is correct
50 Correct 105 ms 3352 KB Output is correct
51 Correct 125 ms 3376 KB Output is correct
52 Correct 100 ms 3376 KB Output is correct
53 Correct 122 ms 3408 KB Output is correct
54 Correct 154 ms 3412 KB Output is correct
55 Correct 104 ms 3412 KB Output is correct
56 Correct 146 ms 3436 KB Output is correct
57 Correct 176 ms 3456 KB Output is correct
58 Correct 149 ms 3464 KB Output is correct
59 Correct 170 ms 3488 KB Output is correct
60 Correct 186 ms 3500 KB Output is correct
61 Correct 144 ms 3412 KB Output is correct
62 Correct 195 ms 3540 KB Output is correct
63 Correct 282 ms 3508 KB Output is correct
64 Correct 273 ms 3512 KB Output is correct
65 Correct 287 ms 3520 KB Output is correct
66 Correct 357 ms 3520 KB Output is correct
67 Correct 279 ms 3512 KB Output is correct
68 Correct 294 ms 3568 KB Output is correct
69 Correct 242 ms 3568 KB Output is correct
70 Correct 286 ms 3616 KB Output is correct
71 Correct 266 ms 3556 KB Output is correct
72 Correct 398 ms 3556 KB Output is correct
73 Correct 233 ms 4408 KB Output is correct
74 Correct 329 ms 3980 KB Output is correct
75 Correct 358 ms 3968 KB Output is correct
76 Correct 384 ms 3960 KB Output is correct
77 Correct 311 ms 3972 KB Output is correct
78 Correct 286 ms 4236 KB Output is correct
79 Correct 301 ms 3924 KB Output is correct
80 Correct 331 ms 3924 KB Output is correct
81 Correct 325 ms 3924 KB Output is correct
82 Correct 338 ms 3888 KB Output is correct
83 Correct 310 ms 4252 KB Output is correct
84 Correct 319 ms 3832 KB Output is correct
85 Correct 322 ms 3832 KB Output is correct
86 Correct 330 ms 3928 KB Output is correct
87 Correct 323 ms 3844 KB Output is correct
88 Correct 306 ms 4000 KB Output is correct
89 Correct 339 ms 3760 KB Output is correct
90 Correct 305 ms 3880 KB Output is correct
91 Correct 335 ms 3916 KB Output is correct
92 Correct 328 ms 4060 KB Output is correct