Submission #583175

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
583175	2022-06-25T00:52:57 Z	HeyYouNotYouYou	Mecho (IOI09_mecho)	C++14	73 / 100	743 ms	16012 KB

mecho

#include <bits/stdc++.h>
#define int long long
#define endl '\n'
using namespace std;
const int N = 801,INF=1e12;
int n , o, srcx, srcy, destx, desty, ar[N][N];
int dx[4]={0,-1,1,0};
int dy[4]={-1,0,0,1};
struct node{
  int x, y, dist;
};
bool valid1(int x, int y){
  if(x>=0 && x<n && y>=0 && y<n && (x!=srcx || y!=srcy) && (x!=destx || y!=desty)) return true;
  return false;
}
bool valid(int x, int y){
  if(x>=0 && x<n && y>=0 && y<n) return true;
  return false;
}
bool check(int mins)
{
  vector<pair<int,int>>hives;
  int arr[n][n];
  for(int i = 0 ; i < n ; i ++)
    for(int j = 0 ; j < n ; j ++)
      {
        arr[i][j]=ar[i][j];
        if(arr[i][j]==1) hives.push_back({i,j});
      }
  queue<pair<int,int>>q;
  int vis[n][n];
  memset(vis,0,sizeof vis);
  for(auto e : hives){
    q.push({e.first,e.second});
    vis[e.first][e.second]=1;
  }

  while(!q.empty())
  {
    int curx=q.front().first;
    int cury=q.front().second;
    q.pop();
    for(int i = 0 ; i < 4; i ++)
    {
      int gox = curx+dx[i], goy = cury+dy[i];
      if(valid(gox,goy) && !vis[gox][goy] && !arr[gox][goy]){
        vis[gox][goy]=1;
        arr[gox][goy]=arr[curx][cury]+1;
        q.push({gox,goy});
      }
    }
  }

  memset(vis,0,sizeof vis);
  q.push({srcx,srcy});
  vis[srcx][srcy]=1;
  if(arr[srcx][srcy]<=mins) return false;
  arr[srcx][srcy]=1;
  while(!q.empty()){
    int curx=q.front().first;
    int cury=q.front().second;
    if(curx==destx&&cury==desty) return true;
    q.pop();
    for(int i = 0 ; i < 4; i ++)
    {
      int gox = curx+dx[i], goy = cury+dy[i];

      if(valid(gox,goy) && !vis[gox][goy] && arr[gox][goy]!=-1){
        if(((arr[curx][cury])/o+1) < arr[gox][goy] - mins){

          vis[gox][goy]=1;
          arr[gox][goy]=arr[curx][cury]+1;
          q.push({gox,goy});
        }
      }
    }
  }


  return false;
}
int32_t main()
{
  //freopen("abc.in", "r", stdin);
  cin >> n >> o;
  int id[n][n];
  for(int i = 0 ; i < n ; i ++){
    for(int j = 0 ; j < n ; j ++){
      char x; cin >> x;
      ar[i][j] = (x=='H'?1:((x=='G'||x=='D'||x=='M')?0:-1));
      if(x=='M') srcx=i, srcy=j;
      if(x=='D') destx=i, desty=j;
    }
  }
  int l = 0 , r = n*n;
  int ans=-1;
  while(l <= r)
  {
    int mid = (l+r)/2;
    if(check(mid))
    {
      l = mid+1;
      ans=mid;
    }
    else
    {
      r = mid-1;
    }
  }
  cout<<ans<<endl;
}

Compilation message

mecho.cpp: In function 'int32_t main()':
mecho.cpp:86:7: warning: unused variable 'id' [-Wunused-variable]
   86 |   int id[n][n];
      |       ^~

Subtask #1

73.0 / 100.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	212 KB	Output is correct
2	Incorrect	0 ms	212 KB	Output isn't correct
3	Correct	0 ms	212 KB	Output is correct
4	Incorrect	0 ms	212 KB	Output isn't correct
5	Correct	0 ms	212 KB	Output is correct
6	Incorrect	1 ms	340 KB	Output isn't correct
7	Incorrect	496 ms	15556 KB	Output isn't correct
8	Correct	1 ms	340 KB	Output is correct
9	Correct	1 ms	340 KB	Output is correct
10	Correct	1 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	2 ms	468 KB	Output isn't correct
14	Correct	3 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	1 ms	340 KB	Output is correct
19	Correct	1 ms	340 KB	Output is correct
20	Correct	1 ms	340 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	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	2 ms	596 KB	Output is correct
27	Correct	2 ms	664 KB	Output is correct
28	Correct	2 ms	596 KB	Output is correct
29	Correct	1 ms	596 KB	Output is correct
30	Correct	2 ms	596 KB	Output is correct
31	Correct	2 ms	724 KB	Output is correct
32	Correct	2 ms	724 KB	Output is correct
33	Correct	44 ms	4316 KB	Output is correct
34	Correct	44 ms	4392 KB	Output is correct
35	Correct	79 ms	4308 KB	Output is correct
36	Correct	46 ms	5212 KB	Output is correct
37	Correct	57 ms	5292 KB	Output is correct
38	Correct	77 ms	5204 KB	Output is correct
39	Correct	65 ms	6316 KB	Output is correct
40	Correct	73 ms	6268 KB	Output is correct
41	Correct	122 ms	6296 KB	Output is correct
42	Correct	77 ms	7256 KB	Output is correct
43	Correct	78 ms	7324 KB	Output is correct
44	Correct	178 ms	7348 KB	Output is correct
45	Correct	99 ms	8396 KB	Output is correct
46	Correct	99 ms	8460 KB	Output is correct
47	Correct	173 ms	8480 KB	Output is correct
48	Correct	118 ms	9684 KB	Output is correct
49	Correct	134 ms	9676 KB	Output is correct
50	Correct	215 ms	9612 KB	Output is correct
51	Correct	146 ms	10968 KB	Output is correct
52	Correct	176 ms	10968 KB	Output is correct
53	Correct	341 ms	10984 KB	Output is correct
54	Correct	159 ms	12340 KB	Output is correct
55	Correct	186 ms	12336 KB	Output is correct
56	Correct	334 ms	12352 KB	Output is correct
57	Correct	204 ms	13780 KB	Output is correct
58	Correct	196 ms	13788 KB	Output is correct
59	Correct	413 ms	13920 KB	Output is correct
60	Correct	238 ms	15308 KB	Output is correct
61	Correct	218 ms	15316 KB	Output is correct
62	Correct	587 ms	15328 KB	Output is correct
63	Correct	501 ms	15332 KB	Output is correct
64	Correct	626 ms	15336 KB	Output is correct
65	Correct	571 ms	15436 KB	Output is correct
66	Correct	552 ms	15336 KB	Output is correct
67	Correct	508 ms	15456 KB	Output is correct
68	Correct	597 ms	15392 KB	Output is correct
69	Correct	646 ms	15388 KB	Output is correct
70	Correct	628 ms	15392 KB	Output is correct
71	Correct	645 ms	15512 KB	Output is correct
72	Incorrect	590 ms	15512 KB	Output isn't correct
73	Incorrect	572 ms	15940 KB	Output isn't correct
74	Correct	661 ms	15940 KB	Output is correct
75	Correct	688 ms	15940 KB	Output is correct
76	Correct	558 ms	15940 KB	Output is correct
77	Correct	743 ms	15932 KB	Output is correct
78	Correct	526 ms	16012 KB	Output is correct
79	Correct	593 ms	15968 KB	Output is correct
80	Correct	525 ms	15936 KB	Output is correct
81	Correct	492 ms	15848 KB	Output is correct
82	Correct	537 ms	15856 KB	Output is correct
83	Correct	560 ms	15772 KB	Output is correct
84	Correct	605 ms	15820 KB	Output is correct
85	Correct	516 ms	15808 KB	Output is correct
86	Correct	691 ms	15772 KB	Output is correct
87	Correct	560 ms	15776 KB	Output is correct
88	Correct	552 ms	15624 KB	Output is correct
89	Correct	618 ms	15656 KB	Output is correct
90	Correct	536 ms	15600 KB	Output is correct
91	Correct	577 ms	15792 KB	Output is correct
92	Correct	577 ms	15664 KB	Output is correct