oj.uz

Submission #583474

# Submission time Handle Problem Language Result Execution time Memory
583474 2022-06-25T11:47:24 Z HeyYouNotYouYou Mecho (IOI09_mecho) C++14
100 / 100
 270 ms 16572 KB 
#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],arr[N][N],arr2[N][N];
int dx[4]={0,-1,1,0};
int dy[4]={-1,0,0,1};
bool vis[N][N];
bool valid(int x, int y){
  if(x>=0 && x<n && y>=0 && y<n) return true;
  return false;
}

bool check(int mins)
{

  memset(vis,0,sizeof vis);
  memset(arr2,0,sizeof arr2);
  queue<pair<int,int>>qq;
  qq.push({srcx,srcy});
  vis[srcx][srcy]=1;
  if(arr[srcx][srcy]<=mins) return false;
  arr2[srcx][srcy]=0;
  while(!qq.empty()){
    int curx=qq.front().first;
    int cury=qq.front().second;
    qq.pop();
    for(int i = 0 ; i < 4; i ++)
    {
      int gox = curx+dx[i], goy = cury+dy[i];

      if(valid(gox,goy) && !vis[gox][goy] && ar[gox][goy]!=-1){
        if(arr[gox][goy] > floor((double)(arr2[curx][cury]+1)/(double)o)+mins){
        //  cout<<curx<<" "<<cury<<" "<<gox<<" "<<goy<<" "<<arr2[curx][cury]<<" "<<arr[gox][goy]-mins<<" "<<c<<" "<<arr2[curx][cury]+(c%o==0&&c>0)<<endl;
          vis[gox][goy]=1;
          arr2[gox][goy]=arr2[curx][cury]+1;
          if(gox==destx&&goy==desty) return true;
          qq.push({gox,goy});
        }
      }
    }
  }


  return false;
}

void bfs(){
  queue<pair<int,int>>q;
  memset(vis,0,sizeof vis);
  for(int i = 0 ; i < n ; i ++)
    for(int j = 0 ; j < n ; j ++)
      {
        if(ar[i][j]==1){
          q.push({i,j});
          vis[i][j]=1;
          arr[i][j]=0;
        }
      }

  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] && ar[gox][goy]!=-1 && (destx!=gox || desty!=goy)){
        vis[gox][goy]=1;
        arr[gox][goy]=arr[curx][cury]+1;
        q.push({gox,goy});
      }
    }
  }

}


int32_t main()
{
  //freopen("abc.in", "r", stdin);
  cin >> n >> o;
  for(int i = 0 ; i < n ; i ++){
    for(int j = 0 ; j < n ; j ++){
      char x; cin >> x;
      arr[i][j]=1e9;
      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;
    }
  }
  bfs();
  int l = 0 , r = 1e9;
  int ans=-1;
  while(l <= r)
  {
    int mid = l + (r - l) / 2;;
  //  cout<<mid<<endl;
    if(check(mid))
    {
      l = mid+1;
      ans=mid;
    }
    else
    {
      r = mid-1;
    }
  }
  cout<<ans<<endl;
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 5972 KB Output is correct
2 Correct 10 ms 5992 KB Output is correct
3 Correct 11 ms 5972 KB Output is correct
4 Correct 15 ms 6012 KB Output is correct
5 Correct 14 ms 6004 KB Output is correct
6 Correct 12 ms 5980 KB Output is correct
7 Correct 165 ms 16184 KB Output is correct
8 Correct 8 ms 5972 KB Output is correct
9 Correct 9 ms 6080 KB Output is correct
10 Correct 9 ms 5972 KB Output is correct
11 Correct 19 ms 6080 KB Output is correct
12 Correct 15 ms 6488 KB Output is correct
13 Correct 14 ms 6356 KB Output is correct
14 Correct 14 ms 6484 KB Output is correct
15 Correct 12 ms 6100 KB Output is correct
16 Correct 11 ms 6100 KB Output is correct
17 Correct 11 ms 6164 KB Output is correct
18 Correct 12 ms 6100 KB Output is correct
19 Correct 19 ms 6100 KB Output is correct
20 Correct 10 ms 6212 KB Output is correct
21 Correct 9 ms 6228 KB Output is correct
22 Correct 9 ms 6228 KB Output is correct
23 Correct 11 ms 6392 KB Output is correct
24 Correct 10 ms 6356 KB Output is correct
25 Correct 10 ms 6476 KB Output is correct
26 Correct 9 ms 6488 KB Output is correct
27 Correct 12 ms 6536 KB Output is correct
28 Correct 9 ms 6484 KB Output is correct
29 Correct 9 ms 6484 KB Output is correct
30 Correct 9 ms 6484 KB Output is correct
31 Correct 10 ms 6612 KB Output is correct
32 Correct 9 ms 6616 KB Output is correct
33 Correct 20 ms 10316 KB Output is correct
34 Correct 20 ms 10452 KB Output is correct
35 Correct 48 ms 10316 KB Output is correct
36 Correct 28 ms 10896 KB Output is correct
37 Correct 26 ms 10964 KB Output is correct
38 Correct 59 ms 10964 KB Output is correct
39 Correct 30 ms 11476 KB Output is correct
40 Correct 26 ms 11488 KB Output is correct
41 Correct 62 ms 11580 KB Output is correct
42 Correct 26 ms 12116 KB Output is correct
43 Correct 28 ms 12116 KB Output is correct
44 Correct 74 ms 12216 KB Output is correct
45 Correct 40 ms 12768 KB Output is correct
46 Correct 35 ms 12748 KB Output is correct
47 Correct 94 ms 12884 KB Output is correct
48 Correct 36 ms 13552 KB Output is correct
49 Correct 36 ms 13356 KB Output is correct
50 Correct 108 ms 13476 KB Output is correct
51 Correct 40 ms 14188 KB Output is correct
52 Correct 40 ms 14036 KB Output is correct
53 Correct 131 ms 14104 KB Output is correct
54 Correct 49 ms 14668 KB Output is correct
55 Correct 53 ms 14712 KB Output is correct
56 Correct 145 ms 14732 KB Output is correct
57 Correct 49 ms 15340 KB Output is correct
58 Correct 51 ms 15328 KB Output is correct
59 Correct 179 ms 15356 KB Output is correct
60 Correct 63 ms 15944 KB Output is correct
61 Correct 59 ms 15964 KB Output is correct
62 Correct 184 ms 15952 KB Output is correct
63 Correct 160 ms 15968 KB Output is correct
64 Correct 246 ms 16056 KB Output is correct
65 Correct 270 ms 15968 KB Output is correct
66 Correct 177 ms 15892 KB Output is correct
67 Correct 174 ms 16092 KB Output is correct
68 Correct 110 ms 16032 KB Output is correct
69 Correct 119 ms 15960 KB Output is correct
70 Correct 85 ms 15948 KB Output is correct
71 Correct 85 ms 16140 KB Output is correct
72 Correct 81 ms 15948 KB Output is correct
73 Correct 118 ms 16444 KB Output is correct
74 Correct 131 ms 16424 KB Output is correct
75 Correct 119 ms 16532 KB Output is correct
76 Correct 140 ms 16460 KB Output is correct
77 Correct 146 ms 16336 KB Output is correct
78 Correct 135 ms 16432 KB Output is correct
79 Correct 119 ms 16444 KB Output is correct
80 Correct 111 ms 16348 KB Output is correct
81 Correct 141 ms 16572 KB Output is correct
82 Correct 121 ms 16460 KB Output is correct
83 Correct 133 ms 16332 KB Output is correct
84 Correct 123 ms 16332 KB Output is correct
85 Correct 123 ms 16364 KB Output is correct
86 Correct 129 ms 16268 KB Output is correct
87 Correct 136 ms 16376 KB Output is correct
88 Correct 125 ms 16176 KB Output is correct
89 Correct 134 ms 16192 KB Output is correct
90 Correct 140 ms 16204 KB Output is correct
91 Correct 138 ms 16284 KB Output is correct
92 Correct 149 ms 16288 KB Output is correct