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Submission #465153

# Submission time Handle Problem Language Result Execution time Memory
465153 2021-08-15T09:15:23 Z MohamedFaresNebili Mecho (IOI09_mecho) C++14
100 / 100
 267 ms 21696 KB 
#include <bits/stdc++.h>
using namespace std;
  int nx[4]={1, -1, 0, 0}, ny[4]={0, 0, 1, -1};
  char grid[2000][2000]; bool vis[2000][2000];
  int d[2000][2000]; int n, s, sx, sy, hx, hy;
  bool bfs(int v)
  {
    if(v*s>=d[sx][sy]) return false;
    memset(vis, 0, sizeof vis); 
    deque<pair<int, pair<int, int>>>q;
    q.push_back(make_pair(v*s, make_pair(sx, sy)));
    vis[sx][sy]=true;
    while(!q.empty()) {
      int dis=q.front().first;
      int a=q.front().second.first, b=q.front().second.second;
      q.pop_front();
      if(grid[a][b]=='D') return true;
      for(int l=0;l<4;l++) {
        int x=a+nx[l], y=b+ny[l];
        if(x>=0&&x<n&&y>=0&&y<n) {
          if(grid[x][y]!='T'&&dis+1<d[x][y]&&!vis[x][y]) {
            q.push_back(make_pair(dis+1, make_pair(x, y))); 
            vis[x][y]=true;
          }
        }
      }
    }
    return false;
  }
int main()
{
  cin>>n>>s;
  deque<pair<int, int>>q;
  memset(d, -1, sizeof(d));
  for(int l=0;l<n;l++) {
    for(int i=0;i<n;i++) 
    {
      cin>>grid[l][i];
      if(grid[l][i]=='H') {
        q.push_back(make_pair(l, i));
        d[l][i]=0;
      }
      else if(grid[l][i]=='M') {
        sx=l; sy=i; grid[l][i]='G';
      }
      else if(grid[l][i]=='D') {
        hx=l; hy=i;
      }
    }
  }
  while(!q.empty()) {
    int a=q.front().first, b=q.front().second; q.pop_front();
    for(int l=0;l<4;l++) {
      int x=a+nx[l], y=b+ny[l];
      if(x>=0&&x<n&&y>=0&&y<n&&grid[x][y]=='G'&&d[x][y]==-1) {
        d[x][y]=d[a][b]+s; q.push_back(make_pair(x, y));
      }
    }
  }
  d[hx][hy]=n*n*s;
  int lo=-1, hi=2*n*n;
  while(hi-lo>1) {
    int mid=(hi+lo)/2;
    if(bfs(mid)) lo=mid;
    else hi=mid;
  }
  cout<<lo<<'\n';
  return 0;
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 19788 KB Output is correct
2 Correct 11 ms 19764 KB Output is correct
3 Correct 12 ms 19804 KB Output is correct
4 Correct 11 ms 19808 KB Output is correct
5 Correct 12 ms 19860 KB Output is correct
6 Correct 11 ms 19780 KB Output is correct
7 Correct 141 ms 21516 KB Output is correct
8 Correct 11 ms 19788 KB Output is correct
9 Correct 10 ms 19788 KB Output is correct
10 Correct 13 ms 19904 KB Output is correct
11 Correct 10 ms 19788 KB Output is correct
12 Correct 11 ms 19916 KB Output is correct
13 Correct 10 ms 19916 KB Output is correct
14 Correct 11 ms 19880 KB Output is correct
15 Correct 11 ms 19788 KB Output is correct
16 Correct 11 ms 19788 KB Output is correct
17 Correct 11 ms 19912 KB Output is correct
18 Correct 11 ms 19916 KB Output is correct
19 Correct 11 ms 19916 KB Output is correct
20 Correct 11 ms 19860 KB Output is correct
21 Correct 11 ms 19884 KB Output is correct
22 Correct 11 ms 19916 KB Output is correct
23 Correct 11 ms 19916 KB Output is correct
24 Correct 11 ms 19968 KB Output is correct
25 Correct 12 ms 19976 KB Output is correct
26 Correct 12 ms 19916 KB Output is correct
27 Correct 12 ms 19916 KB Output is correct
28 Correct 13 ms 19916 KB Output is correct
29 Correct 12 ms 19916 KB Output is correct
30 Correct 12 ms 20004 KB Output is correct
31 Correct 12 ms 19912 KB Output is correct
32 Correct 13 ms 19916 KB Output is correct
33 Correct 21 ms 20516 KB Output is correct
34 Correct 21 ms 20556 KB Output is correct
35 Correct 43 ms 20540 KB Output is correct
36 Correct 27 ms 20584 KB Output is correct
37 Correct 24 ms 20584 KB Output is correct
38 Correct 54 ms 20576 KB Output is correct
39 Correct 27 ms 20636 KB Output is correct
40 Correct 27 ms 20684 KB Output is correct
41 Correct 65 ms 20708 KB Output is correct
42 Correct 31 ms 20820 KB Output is correct
43 Correct 31 ms 20796 KB Output is correct
44 Correct 89 ms 20748 KB Output is correct
45 Correct 34 ms 20932 KB Output is correct
46 Correct 35 ms 20860 KB Output is correct
47 Correct 87 ms 20972 KB Output is correct
48 Correct 42 ms 21032 KB Output is correct
49 Correct 39 ms 20972 KB Output is correct
50 Correct 106 ms 21076 KB Output is correct
51 Correct 42 ms 21032 KB Output is correct
52 Correct 43 ms 21064 KB Output is correct
53 Correct 129 ms 21188 KB Output is correct
54 Correct 49 ms 21204 KB Output is correct
55 Correct 47 ms 21172 KB Output is correct
56 Correct 147 ms 21196 KB Output is correct
57 Correct 54 ms 21332 KB Output is correct
58 Correct 53 ms 21212 KB Output is correct
59 Correct 167 ms 21316 KB Output is correct
60 Correct 61 ms 21412 KB Output is correct
61 Correct 59 ms 21372 KB Output is correct
62 Correct 188 ms 21428 KB Output is correct
63 Correct 162 ms 21508 KB Output is correct
64 Correct 267 ms 21420 KB Output is correct
65 Correct 208 ms 21320 KB Output is correct
66 Correct 179 ms 21444 KB Output is correct
67 Correct 172 ms 21356 KB Output is correct
68 Correct 97 ms 21444 KB Output is correct
69 Correct 96 ms 21444 KB Output is correct
70 Correct 82 ms 21372 KB Output is correct
71 Correct 88 ms 21480 KB Output is correct
72 Correct 74 ms 21444 KB Output is correct
73 Correct 76 ms 21628 KB Output is correct
74 Correct 110 ms 21696 KB Output is correct
75 Correct 126 ms 21636 KB Output is correct
76 Correct 119 ms 21612 KB Output is correct
77 Correct 114 ms 21588 KB Output is correct
78 Correct 127 ms 21572 KB Output is correct
79 Correct 95 ms 21604 KB Output is correct
80 Correct 111 ms 21572 KB Output is correct
81 Correct 126 ms 21680 KB Output is correct
82 Correct 108 ms 21584 KB Output is correct
83 Correct 134 ms 21632 KB Output is correct
84 Correct 119 ms 21632 KB Output is correct
85 Correct 133 ms 21572 KB Output is correct
86 Correct 130 ms 21568 KB Output is correct
87 Correct 131 ms 21636 KB Output is correct
88 Correct 131 ms 21468 KB Output is correct
89 Correct 138 ms 21584 KB Output is correct
90 Correct 138 ms 21580 KB Output is correct
91 Correct 139 ms 21572 KB Output is correct
92 Correct 146 ms 21508 KB Output is correct