oj.uz

Submission #386536

# Submission time Handle Problem Language Result Execution time Memory
386536 2021-04-06T18:39:51 Z tushar_2658 Mecho (IOI09_mecho) C++14
84 / 100
 336 ms 8936 KB 
#include "bits/stdc++.h"
using namespace std;

const int maxn = 805;

char s[maxn][maxn];
int n, S; 
int vis[maxn][maxn], dis[maxn][maxn], dis1[maxn][maxn];
int dx[] = {1, 0, -1, 0};
int dy[] = {0, 1, 0, -1};
int sx, sy, fx, fy;

void precalc(){
  using pii = pair<int, pair<int, int>>;
  priority_queue<pii, vector<pii>, greater<pii>> q;
  for(int i = 1; i <= n; ++i){
    for(int j = 1; j <= n; ++j){
      dis[i][j] = n * n;
      if(s[i][j] == 'H'){
        q.push({0, {i, j}});
        dis[i][j] = 0;
      }
    }
  }
  while(!q.empty()){
    pii src = q.top();
    q.pop();   
    for(int i = 0; i < 4; ++i){
      int newx = src.second.first + dx[i], newy = src.second.second + dy[i];
      if(newx <= n && newx > 0 && newy <= n && newy > 0){
        if(dis[src.second.first][src.second.second] + 1 < dis[newx][newy] && s[newx][newy] != 'T' && s[newx][newy] != 'D'){
          dis[newx][newy] = dis[src.second.first][src.second.second] + 1;
          q.push({dis[newx][newy], {newx, newy}});
        }
      }
    }
  }
}

bool can(int x){
  queue<pair<int, int>> q;
  for(int i = 1; i <= n; ++i){
    for(int j = 1; j <= n; ++j){
      dis1[i][j] = n * n;
      if(s[i][j] == 'T')vis[i][j] = 1;
      else if(s[i][j] == 'M'){
        vis[i][j] = 1;
        dis1[i][j] = 0;
        q.push({i, j});
      }else {
        vis[i][j] = 0;
      }
    }
  }
  while(!q.empty()){
    pair<int, int> src = q.front();
    q.pop();
    for(int i = 0; i < 4; ++i){
      int newx = src.first + dx[i], newy = src.second + dy[i];
      if(newx <= n && newx > 0 && newy <= n && newy > 0){
        if(s[newx][newy] != 'T' && !vis[newx][newy]){
          int cost = (dis1[src.first][src.second] + 1) / S + x; 
          if(cost < dis[newx][newy]){
            vis[newx][newy] = 1;
            dis1[newx][newy] = dis1[src.first][src.second] + 1;
            q.push({newx, newy});
          }
        }
      }
    }
  }
  if(vis[fx][fy])return 1;
  return 0;
}

int main(int argc, char const *argv[])
{
  ios::sync_with_stdio(false);
  cin.tie(0);

  cin >> n >> S;
  for(int i = 1; i <= n; ++i){
    for(int j = 1; j <= n; ++j){
      cin >> s[i][j];
      if(s[i][j] == 'M'){
        sx = i, sy = j;
      }else if(s[i][j] == 'D'){
        fx = i, fy = j;
      }
    }
  }
  precalc();
  int lo = 0, hi = n * n, ans = -1;
  while(lo <= hi){
    int mid = (lo + hi) >> 1;
    if(can(mid)){
      ans = mid;
      lo = mid + 1;
    }else {
      hi = mid - 1;
    }
  }
  cout << ans << '\n';

  return 0;
}

Subtask #1
84.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 492 KB Output is correct
6 Correct 1 ms 492 KB Output is correct
7 Correct 213 ms 8716 KB Output is correct
8 Correct 1 ms 492 KB Output is correct
9 Correct 1 ms 492 KB Output is correct
10 Correct 1 ms 492 KB Output is correct
11 Correct 1 ms 492 KB Output is correct
12 Incorrect 1 ms 1004 KB Output isn't correct
13 Incorrect 2 ms 876 KB Output isn't correct
14 Correct 2 ms 1004 KB Output is correct
15 Correct 1 ms 620 KB Output is correct
16 Correct 1 ms 620 KB Output is correct
17 Correct 1 ms 640 KB Output is correct
18 Correct 1 ms 620 KB Output is correct
19 Correct 1 ms 620 KB Output is correct
20 Correct 1 ms 620 KB Output is correct
21 Correct 1 ms 748 KB Output is correct
22 Correct 1 ms 748 KB Output is correct
23 Correct 1 ms 876 KB Output is correct
24 Correct 1 ms 876 KB Output is correct
25 Correct 1 ms 1004 KB Output is correct
26 Correct 2 ms 1004 KB Output is correct
27 Correct 2 ms 1004 KB Output is correct
28 Correct 2 ms 1004 KB Output is correct
29 Correct 2 ms 1132 KB Output is correct
30 Correct 2 ms 1132 KB Output is correct
31 Correct 2 ms 1132 KB Output is correct
32 Correct 2 ms 1132 KB Output is correct
33 Correct 10 ms 3948 KB Output is correct
34 Correct 11 ms 3948 KB Output is correct
35 Correct 38 ms 3948 KB Output is correct
36 Correct 12 ms 4460 KB Output is correct
37 Correct 14 ms 4460 KB Output is correct
38 Correct 49 ms 4460 KB Output is correct
39 Correct 15 ms 4972 KB Output is correct
40 Correct 17 ms 4972 KB Output is correct
41 Correct 65 ms 4972 KB Output is correct
42 Correct 18 ms 5484 KB Output is correct
43 Correct 21 ms 5484 KB Output is correct
44 Correct 83 ms 5484 KB Output is correct
45 Correct 24 ms 5996 KB Output is correct
46 Correct 32 ms 6076 KB Output is correct
47 Correct 98 ms 5996 KB Output is correct
48 Correct 26 ms 6508 KB Output is correct
49 Correct 36 ms 6508 KB Output is correct
50 Correct 121 ms 6636 KB Output is correct
51 Correct 30 ms 7020 KB Output is correct
52 Correct 33 ms 7148 KB Output is correct
53 Correct 146 ms 7020 KB Output is correct
54 Correct 34 ms 7532 KB Output is correct
55 Correct 40 ms 7532 KB Output is correct
56 Correct 170 ms 7532 KB Output is correct
57 Correct 38 ms 8044 KB Output is correct
58 Correct 44 ms 8096 KB Output is correct
59 Correct 234 ms 8044 KB Output is correct
60 Correct 43 ms 8556 KB Output is correct
61 Correct 58 ms 8684 KB Output is correct
62 Correct 218 ms 8684 KB Output is correct
63 Correct 228 ms 8556 KB Output is correct
64 Correct 336 ms 8684 KB Output is correct
65 Correct 275 ms 8684 KB Output is correct
66 Correct 246 ms 8556 KB Output is correct
67 Correct 237 ms 8556 KB Output is correct
68 Correct 176 ms 8704 KB Output is correct
69 Correct 184 ms 8684 KB Output is correct
70 Correct 157 ms 8812 KB Output is correct
71 Correct 168 ms 8764 KB Output is correct
72 Incorrect 150 ms 8740 KB Output isn't correct
73 Incorrect 157 ms 8668 KB Output isn't correct
74 Correct 180 ms 8668 KB Output is correct
75 Correct 197 ms 8800 KB Output is correct
76 Correct 181 ms 8664 KB Output is correct
77 Correct 182 ms 8800 KB Output is correct
78 Correct 203 ms 8712 KB Output is correct
79 Correct 168 ms 8720 KB Output is correct
80 Correct 185 ms 8712 KB Output is correct
81 Correct 185 ms 8684 KB Output is correct
82 Correct 180 ms 8720 KB Output is correct
83 Correct 204 ms 8936 KB Output is correct
84 Correct 190 ms 8640 KB Output is correct
85 Correct 204 ms 8864 KB Output is correct
86 Correct 204 ms 8640 KB Output is correct
87 Correct 199 ms 8808 KB Output is correct
88 Correct 205 ms 8704 KB Output is correct
89 Correct 248 ms 8704 KB Output is correct
90 Correct 210 ms 8704 KB Output is correct
91 Correct 212 ms 8704 KB Output is correct
92 Correct 230 ms 8736 KB Output is correct