oj.uz

Submission #895617

# Submission time Handle Problem Language Result Execution time Memory
895617 2023-12-30T11:47:15 Z lmkae Mecho (IOI09_mecho) C++14
18 / 100
 398 ms 22312 KB 
#include <bits/stdc++.h>
using namespace std;
#define int long long
 
const int INF = 9000372036854775800;
 
#define rep(i, a, b) for(int i = a; i < (b); ++i)
#define trav(a, x) for(auto& a : x)
#define all(x) x.begin(), x.end()
#define print(arr) for (auto i : arr) cout << i << " "; cout << endl;
typedef vector<vector<int>> vvi;
typedef vector<pair<int, int>> vpi;
typedef vector<int> vi;
typedef pair<int, int> pii;
 
void setFile(string name) {
  freopen((name + "in.txt").c_str(), "r", stdin);
  freopen((name + "out.txt").c_str(), "w", stdout);
}
 
int MOD = 1e9 + 7;
int n, s;

pii pot, home;

bool f(int sleep, vvi dists) {
  int n = dists.size();
  rep(i, 0, n) {
    rep(j, 0, n) {
      if (dists[i][j] == INF) continue;
      dists[i][j] -= sleep;
      if (dists[i][j] <= 0) dists[i][j] = INF;
    }
  }

  // check if valid path exists
  vector<vector<bool>> visited(n, vector<bool>(n, false));
  queue<vi> q;
  q.push({pot.first, pot.second});
  visited[pot.first][pot.second] = true;
  while (!q.empty()) {
    vi curr = q.front(); q.pop();
    if (abs(home.first - curr[0]) + abs(home.second - curr[1]) <= s) return true;
    vpi dir = {{1, 0}, {-1, 0}, {0, 1}, {0, -1}};
    trav(d, dir) {
      int x = curr[0] + d.first, y = curr[1] + d.second;
      if (x < 0 || x >= n || y < 0 || y >= n) continue;
      if (visited[x][y]) continue;
      if (dists[x][y] == INF) continue;
      visited[x][y] = true;
      q.push({x, y});
    }
  }
  return false;
}

int last_true_jump(int lo, int hi, vvi &dists) {
	lo--;
	for (int dif = hi - lo; dif > 0; dif /= 2) {
		while (lo + dif <= hi && f(lo + dif, dists)) { lo += dif; }
	}
	return lo;
}
 
signed main() {
  
  ios::sync_with_stdio(false);
  cin.tie(0);
  cin >> n >> s;
  queue<vi> hives;
  vector<vector<char>> grid(n, vector<char>(n));
  vvi beedist(n, vi(n, INF));
  rep(i, 0, n) {
    rep(j, 0, n) {
      cin >> grid[i][j];
      if (grid[i][j] == 'M') {
        pot = {i, j};
      } else if (grid[i][j] == 'D') {
        home = {i, j};
      } else if (grid[i][j] == 'H') {
        hives.push({i, j, 0});
        beedist[i][j] = 0;
      }
    }
  }

  vpi dir = {{1, 0}, {-1, 0}, {0, 1}, {0, -1}};
  while (!hives.empty()) {
    vi curr = hives.front(); hives.pop();
    trav(d, dir) {
      int x = curr[0] + d.first, y = curr[1] + d.second;
      if (x < 0 || x >= n || y < 0 || y >= n) continue;
      if (grid[x][y] == 'T' || grid[x][y] == 'D') continue;
      if (beedist[x][y] > curr[2] + 1) {
        beedist[x][y] = curr[2] + 1;
        hives.push({x, y, curr[2] + 1});
      }
    }
  }

  vvi mydist(n, vi(n, INF));
  queue<vi> q;
  q.push({pot.first, pot.second, 0});
  mydist[pot.first][pot.second] = 0;
  while (!q.empty()) {
    vi curr = q.front(); q.pop();
    trav(d, dir) {
      int x = curr[0] + d.first, y = curr[1] + d.second;
      if (x < 0 || x >= n || y < 0 || y >= n) continue;
      if (grid[x][y] == 'T') continue;
      if (mydist[x][y] > curr[2] + 1) {
        mydist[x][y] = curr[2] + 1;
        q.push({x, y, curr[2] + 1});
      }
    }
  }
  vvi dists(n, vi(n, INF));
  rep(i, 0, n) {
    rep(j, 0, n) {
      if (mydist[i][j] == INF) {
        dists[i][j] = INF;
        continue;
      } if (mydist[i][j] == 0) continue;
      
      if (mydist[i][j] % s == 0) {
        mydist[i][j] /= s;
      } else {
        mydist[i][j] /= s;
        mydist[i][j]++;
      }
      dists[i][j] = beedist[i][j] - mydist[i][j];
    }
  }

  // trav(row, dists) {
  //   trav(i, row) {
  //     if (i == INF) cout << "-1 ";
  //     else cout << i << " ";
  //   }
  //   cout << endl;
  // }

  int ans = last_true_jump(0, n*n, dists);
  cout << ans << endl;

  




  
  
}

Compilation message

mecho.cpp: In function 'void setFile(std::string)':
mecho.cpp:17:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |   freopen((name + "in.txt").c_str(), "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mecho.cpp:18:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |   freopen((name + "out.txt").c_str(), "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
18.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 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 Incorrect 0 ms 348 KB Output isn't correct
6 Incorrect 0 ms 348 KB Output isn't correct
7 Incorrect 290 ms 22152 KB Output isn't correct
8 Correct 0 ms 348 KB Output is correct
9 Incorrect 1 ms 348 KB Output isn't correct
10 Incorrect 0 ms 348 KB Output isn't correct
11 Incorrect 0 ms 600 KB Output isn't correct
12 Incorrect 1 ms 348 KB Output isn't correct
13 Correct 1 ms 600 KB Output is correct
14 Incorrect 1 ms 348 KB Output isn't correct
15 Correct 1 ms 344 KB Output is correct
16 Incorrect 1 ms 344 KB Output isn't correct
17 Correct 1 ms 348 KB Output is correct
18 Incorrect 0 ms 348 KB Output isn't correct
19 Correct 1 ms 344 KB Output is correct
20 Incorrect 1 ms 348 KB Output isn't correct
21 Correct 1 ms 348 KB Output is correct
22 Incorrect 1 ms 348 KB Output isn't correct
23 Correct 1 ms 348 KB Output is correct
24 Incorrect 1 ms 460 KB Output isn't correct
25 Correct 1 ms 344 KB Output is correct
26 Incorrect 1 ms 348 KB Output isn't correct
27 Correct 1 ms 604 KB Output is correct
28 Incorrect 1 ms 604 KB Output isn't correct
29 Correct 1 ms 604 KB Output is correct
30 Incorrect 1 ms 600 KB Output isn't correct
31 Correct 1 ms 604 KB Output is correct
32 Incorrect 1 ms 604 KB Output isn't correct
33 Correct 13 ms 4440 KB Output is correct
34 Incorrect 15 ms 4444 KB Output isn't correct
35 Incorrect 19 ms 4444 KB Output isn't correct
36 Correct 18 ms 5724 KB Output is correct
37 Incorrect 18 ms 5976 KB Output isn't correct
38 Incorrect 25 ms 5668 KB Output isn't correct
39 Correct 22 ms 7316 KB Output is correct
40 Incorrect 22 ms 7260 KB Output isn't correct
41 Incorrect 32 ms 7252 KB Output isn't correct
42 Correct 27 ms 8824 KB Output is correct
43 Incorrect 29 ms 8772 KB Output isn't correct
44 Incorrect 35 ms 8848 KB Output isn't correct
45 Correct 33 ms 10588 KB Output is correct
46 Incorrect 34 ms 10668 KB Output isn't correct
47 Incorrect 50 ms 10580 KB Output isn't correct
48 Correct 39 ms 12376 KB Output is correct
49 Incorrect 41 ms 12380 KB Output isn't correct
50 Incorrect 78 ms 12624 KB Output isn't correct
51 Correct 49 ms 14684 KB Output is correct
52 Incorrect 57 ms 14676 KB Output isn't correct
53 Incorrect 73 ms 14728 KB Output isn't correct
54 Correct 53 ms 16976 KB Output is correct
55 Incorrect 57 ms 16724 KB Output isn't correct
56 Incorrect 83 ms 16896 KB Output isn't correct
57 Correct 65 ms 19336 KB Output is correct
58 Incorrect 64 ms 19284 KB Output isn't correct
59 Incorrect 81 ms 19428 KB Output isn't correct
60 Correct 82 ms 21812 KB Output is correct
61 Incorrect 69 ms 21840 KB Output isn't correct
62 Incorrect 117 ms 22096 KB Output isn't correct
63 Incorrect 257 ms 22040 KB Output isn't correct
64 Incorrect 70 ms 21840 KB Output isn't correct
65 Incorrect 398 ms 22192 KB Output isn't correct
66 Correct 371 ms 22024 KB Output is correct
67 Correct 293 ms 22076 KB Output is correct
68 Incorrect 173 ms 22044 KB Output isn't correct
69 Incorrect 77 ms 21820 KB Output isn't correct
70 Incorrect 172 ms 22244 KB Output isn't correct
71 Incorrect 199 ms 22072 KB Output isn't correct
72 Correct 174 ms 22044 KB Output is correct
73 Correct 127 ms 22112 KB Output is correct
74 Incorrect 144 ms 22128 KB Output isn't correct
75 Incorrect 243 ms 22192 KB Output isn't correct
76 Incorrect 230 ms 22092 KB Output isn't correct
77 Incorrect 194 ms 22132 KB Output isn't correct
78 Incorrect 253 ms 22212 KB Output isn't correct
79 Incorrect 158 ms 22104 KB Output isn't correct
80 Incorrect 227 ms 22312 KB Output isn't correct
81 Incorrect 255 ms 22092 KB Output isn't correct
82 Incorrect 193 ms 22072 KB Output isn't correct
83 Incorrect 268 ms 22068 KB Output isn't correct
84 Incorrect 144 ms 22084 KB Output isn't correct
85 Incorrect 253 ms 22012 KB Output isn't correct
86 Incorrect 243 ms 22096 KB Output isn't correct
87 Incorrect 248 ms 22040 KB Output isn't correct
88 Incorrect 272 ms 22088 KB Output isn't correct
89 Incorrect 132 ms 22152 KB Output isn't correct
90 Incorrect 283 ms 22068 KB Output isn't correct
91 Incorrect 236 ms 22092 KB Output isn't correct
92 Incorrect 257 ms 22256 KB Output isn't correct