oj.uz

Submission #583983

# Submission time Handle Problem Language Result Execution time Memory
583983 2022-06-26T15:32:34 Z Omar_Elgedawy Mecho (IOI09_mecho) C++14
84 / 100
 209 ms 5164 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();
    vis[i][j]=1;
    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});
        vis[x][y]=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:76:15: warning: variable 'xed' set but not used [-Wunused-but-set-variable]
   76 |   int xst,yst,xed,yed;
      |               ^~~
mecho.cpp:76:19: warning: variable 'yed' set but not used [-Wunused-but-set-variable]
   76 |   int xst,yst,xed,yed;
      |                   ^~~
mecho.cpp:108:15: warning: 'yst' may be used uninitialized in this function [-Wmaybe-uninitialized]
  108 |     int x=bfs2(xst,yst,m);
      |           ~~~~^~~~~~~~~~~
mecho.cpp:108:15: 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 95 ms 4812 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 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 0 ms 340 KB Output is correct
16 Correct 0 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 0 ms 468 KB Output is correct
21 Correct 0 ms 468 KB Output is correct
22 Correct 1 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 596 KB Output is correct
32 Correct 1 ms 596 KB Output is correct
33 Correct 6 ms 1876 KB Output is correct
34 Correct 6 ms 1876 KB Output is correct
35 Correct 27 ms 2124 KB Output is correct
36 Correct 8 ms 2132 KB Output is correct
37 Correct 7 ms 2204 KB Output is correct
38 Correct 28 ms 2360 KB Output is correct
39 Correct 9 ms 2388 KB Output is correct
40 Correct 8 ms 2388 KB Output is correct
41 Correct 50 ms 2652 KB Output is correct
42 Correct 11 ms 2660 KB Output is correct
43 Correct 11 ms 2612 KB Output is correct
44 Correct 55 ms 2912 KB Output is correct
45 Correct 12 ms 2900 KB Output is correct
46 Correct 15 ms 2812 KB Output is correct
47 Correct 52 ms 3172 KB Output is correct
48 Correct 14 ms 3052 KB Output is correct
49 Correct 13 ms 3156 KB Output is correct
50 Correct 67 ms 3504 KB Output is correct
51 Correct 16 ms 3284 KB Output is correct
52 Correct 18 ms 3352 KB Output is correct
53 Correct 85 ms 3796 KB Output is correct
54 Correct 19 ms 3540 KB Output is correct
55 Correct 18 ms 3612 KB Output is correct
56 Correct 92 ms 3996 KB Output is correct
57 Correct 20 ms 3860 KB Output is correct
58 Correct 24 ms 3760 KB Output is correct
59 Correct 110 ms 4408 KB Output is correct
60 Correct 23 ms 3980 KB Output is correct
61 Correct 23 ms 3992 KB Output is correct
62 Correct 121 ms 4716 KB Output is correct
63 Correct 122 ms 3968 KB Output is correct
64 Correct 209 ms 4076 KB Output is correct
65 Correct 145 ms 4044 KB Output is correct
66 Correct 124 ms 4080 KB Output is correct
67 Correct 122 ms 4080 KB Output is correct
68 Correct 67 ms 4120 KB Output is correct
69 Correct 54 ms 4116 KB Output is correct
70 Correct 44 ms 4056 KB Output is correct
71 Correct 47 ms 4120 KB Output is correct
72 Incorrect 41 ms 4052 KB Output isn't correct
73 Incorrect 83 ms 5116 KB Output isn't correct
74 Correct 85 ms 5120 KB Output is correct
75 Correct 82 ms 5112 KB Output is correct
76 Correct 69 ms 5076 KB Output is correct
77 Correct 69 ms 5080 KB Output is correct
78 Correct 87 ms 5164 KB Output is correct
79 Correct 54 ms 5076 KB Output is correct
80 Correct 74 ms 5080 KB Output is correct
81 Correct 81 ms 5032 KB Output is correct
82 Correct 71 ms 5160 KB Output is correct
83 Correct 85 ms 4900 KB Output is correct
84 Correct 76 ms 5020 KB Output is correct
85 Correct 83 ms 4992 KB Output is correct
86 Correct 99 ms 5008 KB Output is correct
87 Correct 90 ms 5008 KB Output is correct
88 Correct 95 ms 4832 KB Output is correct
89 Correct 88 ms 4940 KB Output is correct
90 Correct 93 ms 4940 KB Output is correct
91 Correct 122 ms 5020 KB Output is correct
92 Correct 100 ms 4868 KB Output is correct