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Submission #583984

# Submission time Handle Problem Language Result Execution time Memory
583984 2022-06-26T15:35:59 Z Omar_Elgedawy Mecho (IOI09_mecho) C++14
84 / 100
 214 ms 5828 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'&&!vis[x][y]){
        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')&&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]=='T')
        block[i][j]=-1;
      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();
  // for(int i=0;i<n;i++){
  //   for(int j=0;j<n;j++){
  //     cout<<block[i][j]<<' ';
  //   }cout<<el;
  // }
  int l=0,r=n*n;
  int mx=-1;
  while(l<=r){
    int m=(l+r)/2;
    // cout<<l<<' '<<m<<' '<<r<<el;
    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(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:106:15: warning: 'yst' may be used uninitialized in this function [-Wmaybe-uninitialized]
  106 |     int x=bfs2(xst,yst,m);
      |           ~~~~^~~~~~~~~~~
mecho.cpp:106:15: 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 110 ms 4732 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 0 ms 340 KB Output is correct
12 Incorrect 1 ms 596 KB Output isn't correct
13 Incorrect 1 ms 468 KB Output isn't correct
14 Correct 1 ms 596 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 0 ms 340 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 0 ms 340 KB Output is correct
21 Correct 1 ms 468 KB Output is correct
22 Correct 0 ms 468 KB Output is correct
23 Correct 1 ms 468 KB Output is correct
24 Correct 1 ms 468 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 596 KB Output is correct
30 Correct 1 ms 596 KB Output is correct
31 Correct 1 ms 672 KB Output is correct
32 Correct 1 ms 596 KB Output is correct
33 Correct 7 ms 1876 KB Output is correct
34 Correct 7 ms 1876 KB Output is correct
35 Correct 22 ms 1980 KB Output is correct
36 Correct 7 ms 2132 KB Output is correct
37 Correct 7 ms 2132 KB Output is correct
38 Correct 30 ms 2132 KB Output is correct
39 Correct 8 ms 2388 KB Output is correct
40 Correct 9 ms 2324 KB Output is correct
41 Correct 40 ms 2364 KB Output is correct
42 Correct 11 ms 2644 KB Output is correct
43 Correct 10 ms 2644 KB Output is correct
44 Correct 48 ms 2644 KB Output is correct
45 Correct 13 ms 2900 KB Output is correct
46 Correct 16 ms 2864 KB Output is correct
47 Correct 60 ms 3020 KB Output is correct
48 Correct 16 ms 3068 KB Output is correct
49 Correct 15 ms 3156 KB Output is correct
50 Correct 99 ms 3172 KB Output is correct
51 Correct 17 ms 3360 KB Output is correct
52 Correct 18 ms 3252 KB Output is correct
53 Correct 83 ms 3404 KB Output is correct
54 Correct 20 ms 3592 KB Output is correct
55 Correct 20 ms 3540 KB Output is correct
56 Correct 98 ms 3600 KB Output is correct
57 Correct 24 ms 3772 KB Output is correct
58 Correct 30 ms 3760 KB Output is correct
59 Correct 154 ms 3796 KB Output is correct
60 Correct 26 ms 4048 KB Output is correct
61 Correct 24 ms 4052 KB Output is correct
62 Correct 127 ms 4000 KB Output is correct
63 Correct 116 ms 4080 KB Output is correct
64 Correct 214 ms 3976 KB Output is correct
65 Correct 149 ms 3980 KB Output is correct
66 Correct 125 ms 4080 KB Output is correct
67 Correct 128 ms 4092 KB Output is correct
68 Correct 67 ms 4104 KB Output is correct
69 Correct 61 ms 4164 KB Output is correct
70 Correct 48 ms 4068 KB Output is correct
71 Correct 53 ms 4172 KB Output is correct
72 Incorrect 49 ms 4104 KB Output isn't correct
73 Incorrect 105 ms 5712 KB Output isn't correct
74 Correct 90 ms 5604 KB Output is correct
75 Correct 98 ms 5828 KB Output is correct
76 Correct 88 ms 5636 KB Output is correct
77 Correct 91 ms 5664 KB Output is correct
78 Correct 108 ms 5436 KB Output is correct
79 Correct 73 ms 5564 KB Output is correct
80 Correct 92 ms 5548 KB Output is correct
81 Correct 107 ms 5452 KB Output is correct
82 Correct 88 ms 5452 KB Output is correct
83 Correct 107 ms 5180 KB Output is correct
84 Correct 106 ms 5224 KB Output is correct
85 Correct 108 ms 5296 KB Output is correct
86 Correct 99 ms 5184 KB Output is correct
87 Correct 103 ms 5272 KB Output is correct
88 Correct 117 ms 4868 KB Output is correct
89 Correct 123 ms 4908 KB Output is correct
90 Correct 120 ms 4916 KB Output is correct
91 Correct 104 ms 4840 KB Output is correct
92 Correct 111 ms 4928 KB Output is correct