oj.uz

Submission #567961

# Submission time Handle Problem Language Result Execution time Memory
567961 2022-05-24T12:07:42 Z Quan2003 Mecho (IOI09_mecho) C++17
100 / 100
 263 ms 15568 KB 
#include <bits/stdc++.h>
#include <iostream>
#include<queue>
#include<vector>
#include<utility>
using namespace std;
typedef long long ll;
const int sz=1005;
int n,s;
int d1[sz][sz];
int d0[sz][sz];
bool vis1[sz][sz];
bool vis0[sz][sz];
vector<pair<int,int>>hiv;
int px,py;
int dx,dy;
ll step[sz][sz];
int movex[4]={0,0,1,-1};
int movey[4]={-1,1,0,0};
char c[sz][sz];
void bfs(vector<pair<int,int>>&a,int d[sz][sz],bool visited[sz][sz]){
    queue<pair<int,int>>q;
    for (auto i:a){
        q.push(i);
        visited[i.first][i.second]=1;
    }
    while (!q.empty()){
        int x1=q.front().first;
        int y1=q.front().second;
        q.pop();
        for (int i=0;i<4;i++){
            int x2=x1+movex[i];
            int y2=y1+movey[i];
            if (x2<0 or x2>=n) continue;
            if (y2<0 or y2>=n) continue;
            if (c[x2][y2]=='D' or c[x2][y2]=='T' or visited[x2][y2]) continue;
            visited[x2][y2]=1;
            d[x2][y2]=d[x1][y1]+1;
            q.push({x2,y2}); 
        }
    } 
}
bool bsearch(int k){
    if (k==d0[px][py]) return 0;
    for (int i=0;i<n;i++){
       for(int j=0;j<n;j++){
           vis1[i][j]=0;
           d1[i][j]=0;
           step[i][j]=INT_MAX;
       }
    }
    queue<pair<int,int>>q;
    q.push({px,py});
    step[px][py]=k;
    while (!q.empty()){
        int sx=q.front().first;
        int sy=q.front().second;
        q.pop();
        for (int i=0;i<4;i++){
            int tx=sx+movex[i];
            int ty=sy+movey[i];
            if (tx<0 or tx>=n) continue;
            if (ty<0 or ty>=n) continue;
            if (c[tx][ty]=='H' or c[tx][ty]=='T' or vis1[tx][ty]) continue;
            d1[tx][ty]=d1[sx][sy]+1;
            int moves=k+d1[tx][ty]/s;
            if (moves>=d0[tx][ty]) continue;
            step[tx][ty]=moves+1;
            vis1[tx][ty]=1;
            q.push({tx,ty});
        }
    } for (int i=0;i<4;i++){
         int tx=dx+movex[i];
         int ty=dy+movey[i];
         if (tx<0 or tx>=n or ty<0 or ty>=n or c[tx][ty]=='T' or c[tx][ty]=='H') continue;
         if (step[tx][ty]<=d0[tx][ty]) return 1;
    } return 0;
}
int main(){
    cin>>n>>s;
    for (int i=0;i<n;i++){
        for(int j=0;j<n;j++){
             cin>>c[i][j];
             if (c[i][j]=='D'){
                 dx=i;dy=j;
             }
             if (c[i][j]=='M'){
                 px=i;py=j;
             } if (c[i][j]=='H'){
                 hiv.push_back({i,j});
             }
        }
    } 
      bfs(hiv,d0,vis0);
      int low=0;int high=1e9;
      while (high>low){
          int mid=low+(high-low+1)/2;
          if (bsearch(mid)) low=mid;
          else high=mid-1;
      } 
        if (!bsearch(low)) cout <<-1;
        else cout <<low;
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 0 ms 468 KB Output is correct
7 Correct 149 ms 15352 KB Output is correct
8 Correct 1 ms 468 KB Output is correct
9 Correct 0 ms 468 KB Output is correct
10 Correct 1 ms 468 KB Output is correct
11 Correct 1 ms 468 KB Output is correct
12 Correct 1 ms 1236 KB Output is correct
13 Correct 1 ms 980 KB Output is correct
14 Correct 1 ms 1236 KB Output is correct
15 Correct 1 ms 596 KB Output is correct
16 Correct 1 ms 596 KB Output is correct
17 Correct 1 ms 596 KB Output is correct
18 Correct 1 ms 596 KB Output is correct
19 Correct 1 ms 724 KB Output is correct
20 Correct 1 ms 724 KB Output is correct
21 Correct 1 ms 852 KB Output is correct
22 Correct 1 ms 852 KB Output is correct
23 Correct 1 ms 980 KB Output is correct
24 Correct 1 ms 980 KB Output is correct
25 Correct 1 ms 1236 KB Output is correct
26 Correct 1 ms 1236 KB Output is correct
27 Correct 1 ms 1236 KB Output is correct
28 Correct 1 ms 1236 KB Output is correct
29 Correct 2 ms 1364 KB Output is correct
30 Correct 1 ms 1364 KB Output is correct
31 Correct 2 ms 1364 KB Output is correct
32 Correct 2 ms 1364 KB Output is correct
33 Correct 14 ms 6484 KB Output is correct
34 Correct 15 ms 6372 KB Output is correct
35 Correct 32 ms 6476 KB Output is correct
36 Correct 18 ms 7508 KB Output is correct
37 Correct 18 ms 7508 KB Output is correct
38 Correct 41 ms 7508 KB Output is correct
39 Correct 21 ms 8532 KB Output is correct
40 Correct 22 ms 8532 KB Output is correct
41 Correct 50 ms 8472 KB Output is correct
42 Correct 25 ms 9648 KB Output is correct
43 Correct 26 ms 9592 KB Output is correct
44 Correct 68 ms 9660 KB Output is correct
45 Correct 34 ms 10612 KB Output is correct
46 Correct 32 ms 10536 KB Output is correct
47 Correct 86 ms 10596 KB Output is correct
48 Correct 40 ms 11500 KB Output is correct
49 Correct 40 ms 11476 KB Output is correct
50 Correct 131 ms 11468 KB Output is correct
51 Correct 50 ms 12376 KB Output is correct
52 Correct 51 ms 12392 KB Output is correct
53 Correct 129 ms 12456 KB Output is correct
54 Correct 65 ms 13356 KB Output is correct
55 Correct 65 ms 13328 KB Output is correct
56 Correct 144 ms 13392 KB Output is correct
57 Correct 73 ms 14320 KB Output is correct
58 Correct 72 ms 14328 KB Output is correct
59 Correct 175 ms 14304 KB Output is correct
60 Correct 82 ms 15228 KB Output is correct
61 Correct 91 ms 15256 KB Output is correct
62 Correct 204 ms 15256 KB Output is correct
63 Correct 179 ms 15260 KB Output is correct
64 Correct 263 ms 15224 KB Output is correct
65 Correct 259 ms 15348 KB Output is correct
66 Correct 200 ms 15260 KB Output is correct
67 Correct 185 ms 15260 KB Output is correct
68 Correct 107 ms 15284 KB Output is correct
69 Correct 119 ms 15232 KB Output is correct
70 Correct 107 ms 15284 KB Output is correct
71 Correct 96 ms 15236 KB Output is correct
72 Correct 92 ms 15252 KB Output is correct
73 Correct 99 ms 15552 KB Output is correct
74 Correct 129 ms 15552 KB Output is correct
75 Correct 131 ms 15500 KB Output is correct
76 Correct 125 ms 15556 KB Output is correct
77 Correct 129 ms 15552 KB Output is correct
78 Correct 136 ms 15516 KB Output is correct
79 Correct 127 ms 15568 KB Output is correct
80 Correct 128 ms 15516 KB Output is correct
81 Correct 127 ms 15520 KB Output is correct
82 Correct 121 ms 15416 KB Output is correct
83 Correct 139 ms 15476 KB Output is correct
84 Correct 136 ms 15384 KB Output is correct
85 Correct 138 ms 15436 KB Output is correct
86 Correct 155 ms 15436 KB Output is correct
87 Correct 142 ms 15476 KB Output is correct
88 Correct 142 ms 15292 KB Output is correct
89 Correct 150 ms 15396 KB Output is correct
90 Correct 151 ms 15416 KB Output is correct
91 Correct 148 ms 15432 KB Output is correct
92 Correct 160 ms 15416 KB Output is correct