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Submission #583999

# Submission time Handle Problem Language Result Execution time Memory
583999 2022-06-26T16:08:26 Z Omar_Elgedawy Mecho (IOI09_mecho) C++14
84 / 100
 183 ms 9888 KB 
#include <bits/stdc++.h>
using namespace std;
#define cin(vec)        for(auto& i : vec) cin >> i
#define cout(vec)       for(auto& i : vec) cout << i << " "; cout << "\n";
#define fast            ios::sync_with_stdio(0);cin.tie(0);
#define loop(i,a,b)     for (int i = a; i < b; i++)
#define F               first
#define S               second
#define pb(n)           push_back(n)
#define pf(n)           push_front(n)
#define dci(d)          fixed<<setprecision(d)
#define sp              ' '
#define el              '\n'
#define all(v)          v.begin(),v.end()
#define int             long long
int dx[8]= {0,0,1,-1,-1,1,1,-1};
int dy[8]= {-1,1,0,0,-1,1,-1,1};
int const N=8e2+5,M=1e2+5,Mod=1e9;
char grid[N][N];
int block[N][N],n,s;
bool vis[N][N];
int valid(int i,int j){
  return (i>=0&&j>=0&&i<n&&j<n);
}
struct cell{
  int i;
  int j;
  int t;
};
queue<cell>q;
void bfs(){
  while(q.size()){
    int i=q.front().i;
    int j=q.front().j;
    int t=q.front().t;
    q.pop();
    if(block[i][j]<=t){
      continue;
    }
    block[i][j]=t;
    for(int k=0;k<4;k++){
      int x=dx[k]+i;
      int y=dy[k]+j;
      if(valid(x,y)&&(grid[x][y]=='G'||grid[x][y]=='M')){
        q.push({x,y,t+1});
      }
    }
  }
}
bool bfs2(int i,int j,int st){
  while(q.size())q.pop();
  q.push({i,j,0});
  vis[i][j]=1;
  int t;
  while(q.size()){
    i=q.front().i;
    j=q.front().j;
    t=q.front().t;
    q.pop();
    if(grid[i][j]=='D')return 1;
    for(int k=0;k<4;k++){
      int x=dx[k]+i;
      int y=dy[k]+j;
      if(valid(x,y)&&(grid[x][y]=='G'||grid[x][y]=='D'||grid[x][y]=='M')&&block[x][y]>st+(t+1)/s&&!vis[x][y]){
        q.push({x,y,t+1});
        vis[x][y]=1;
      }
    }
  }
  return 0;
}
void testcase(int h){
  cin>>n>>s;
  int xst,yst,xed,yed;
  for(int i=0;i<n;i++){
    for(int j=0;j<n;j++){
      block[i][j]=1e9;
    }
  }
  for(int i=0;i<n;i++){
    string s;cin>>s;
    for(int j=0;j<n;j++){
      grid[i][j]=s[j];
      if(s[j]=='H')q.push({i,j,0});
      if(s[j]=='M')xst=i,yst=j;
      if(s[j]=='D')xed=i,yed=j;
    }
  }
  bfs();
  int l=0,r=1e9;
  int mx=-1;
  while(l<=r){
    int m=(l+r)/2;
    for(int i=0;i<n;i++)
      for(int j=0;j<n;j++)
        vis[i][j]=0;
    int x=bfs2(xst,yst,m);
    if(x){
      mx=m;
      l=m+1;
    }
    else{
      r=m-1;
    }
  }
  cout<<mx<<el;
}
int32_t main()
{
  // fast
  testcase(1);
  // int tc;cin>>tc;for(int i=1;i<=tc;i++)testcase(i);
  return 0;
}

Compilation message

mecho.cpp: In function 'void testcase(long long int)':
mecho.cpp:74:15: warning: variable 'xed' set but not used [-Wunused-but-set-variable]
   74 |   int xst,yst,xed,yed;
      |               ^~~
mecho.cpp:74:19: warning: variable 'yed' set but not used [-Wunused-but-set-variable]
   74 |   int xst,yst,xed,yed;
      |                   ^~~
mecho.cpp:97:15: warning: 'yst' may be used uninitialized in this function [-Wmaybe-uninitialized]
   97 |     int x=bfs2(xst,yst,m);
      |           ~~~~^~~~~~~~~~~
mecho.cpp:97:15: warning: 'xst' may be used uninitialized in this function [-Wmaybe-uninitialized]

Subtask #1
84.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 124 ms 7780 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Incorrect 1 ms 596 KB Output isn't correct
13 Incorrect 1 ms 596 KB Output isn't correct
14 Correct 1 ms 724 KB Output is correct
15 Correct 0 ms 340 KB Output is correct
16 Correct 0 ms 340 KB Output is correct
17 Correct 0 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 0 ms 468 KB Output is correct
20 Correct 0 ms 468 KB Output is correct
21 Correct 1 ms 468 KB Output is correct
22 Correct 1 ms 468 KB Output is correct
23 Correct 1 ms 596 KB Output is correct
24 Correct 1 ms 596 KB Output is correct
25 Correct 1 ms 596 KB Output is correct
26 Correct 1 ms 596 KB Output is correct
27 Correct 1 ms 596 KB Output is correct
28 Correct 1 ms 596 KB Output is correct
29 Correct 1 ms 724 KB Output is correct
30 Correct 1 ms 724 KB Output is correct
31 Correct 1 ms 724 KB Output is correct
32 Correct 1 ms 724 KB Output is correct
33 Correct 6 ms 3024 KB Output is correct
34 Correct 6 ms 3028 KB Output is correct
35 Correct 23 ms 3116 KB Output is correct
36 Correct 7 ms 3412 KB Output is correct
37 Correct 8 ms 3412 KB Output is correct
38 Correct 33 ms 3412 KB Output is correct
39 Correct 9 ms 3832 KB Output is correct
40 Correct 9 ms 3796 KB Output is correct
41 Correct 41 ms 3916 KB Output is correct
42 Correct 11 ms 4160 KB Output is correct
43 Correct 12 ms 4208 KB Output is correct
44 Correct 57 ms 4284 KB Output is correct
45 Correct 13 ms 4576 KB Output is correct
46 Correct 14 ms 4564 KB Output is correct
47 Correct 65 ms 4652 KB Output is correct
48 Correct 15 ms 4948 KB Output is correct
49 Correct 15 ms 4948 KB Output is correct
50 Correct 76 ms 5004 KB Output is correct
51 Correct 18 ms 5436 KB Output is correct
52 Correct 18 ms 5436 KB Output is correct
53 Correct 112 ms 5488 KB Output is correct
54 Correct 20 ms 5792 KB Output is correct
55 Correct 21 ms 5768 KB Output is correct
56 Correct 106 ms 5872 KB Output is correct
57 Correct 23 ms 6192 KB Output is correct
58 Correct 24 ms 6184 KB Output is correct
59 Correct 125 ms 6220 KB Output is correct
60 Correct 25 ms 6520 KB Output is correct
61 Correct 26 ms 6612 KB Output is correct
62 Correct 148 ms 6664 KB Output is correct
63 Correct 115 ms 6732 KB Output is correct
64 Correct 183 ms 6616 KB Output is correct
65 Correct 179 ms 6596 KB Output is correct
66 Correct 128 ms 6600 KB Output is correct
67 Correct 122 ms 6608 KB Output is correct
68 Correct 62 ms 6660 KB Output is correct
69 Correct 60 ms 6660 KB Output is correct
70 Correct 46 ms 6664 KB Output is correct
71 Correct 50 ms 6776 KB Output is correct
72 Incorrect 45 ms 6660 KB Output isn't correct
73 Incorrect 81 ms 9868 KB Output isn't correct
74 Correct 118 ms 9888 KB Output is correct
75 Correct 112 ms 9628 KB Output is correct
76 Correct 103 ms 9780 KB Output is correct
77 Correct 109 ms 9848 KB Output is correct
78 Correct 109 ms 9216 KB Output is correct
79 Correct 88 ms 9388 KB Output is correct
80 Correct 95 ms 9456 KB Output is correct
81 Correct 108 ms 9448 KB Output is correct
82 Correct 95 ms 9560 KB Output is correct
83 Correct 123 ms 9036 KB Output is correct
84 Correct 107 ms 8912 KB Output is correct
85 Correct 107 ms 8928 KB Output is correct
86 Correct 111 ms 8716 KB Output is correct
87 Correct 112 ms 8404 KB Output is correct
88 Correct 120 ms 8460 KB Output is correct
89 Correct 119 ms 8396 KB Output is correct
90 Correct 124 ms 8336 KB Output is correct
91 Correct 128 ms 8396 KB Output is correct
92 Correct 121 ms 8240 KB Output is correct