oj.uz

Submission #870685

# Submission time Handle Problem Language Result Execution time Memory
870685 2023-11-08T19:58:40 Z Essa2006 Mecho (IOI09_mecho) C++14
100 / 100
 193 ms 6552 KB 
#include<bits/stdc++.h>
using namespace std;
#define ll long long 
#define endl '\n'
#define FF first
#define SS second
#define all(a) a.begin(), a.end()
#define mod (ll)(1000000007)
const int inf=1e9;
int n, s, Md, can;
array<int, 2>Str, End;
vector<string>A;
vector<vector<int>>Pri;
queue<array<int, 2>>q, qu;
int dx[]={0, 0, 1, -1};
int dy[]={1, -1, 0, 0}; 
 
void pre(){
    A.clear(), Pri.clear();
    A.resize(n), Pri.resize(n, vector<int>(n, inf));
}
 
bool valid(int i, int j){
    return !(i<0 || i>=n || j<0 || j>=n);
}
 
void bfs(){
    while(!q.empty()){
        array<int, 2>u=q.front();
        q.pop();
        int i=u[0], j=u[1];
        for(int f=0;f<4;f++){
            int ii=i+dx[f], jj=j+dy[f];
            if(valid(ii, jj) && A[ii][jj]!='D' && Pri[i][j]+1<Pri[ii][jj])
                Pri[ii][jj]=Pri[i][j]+1, q.push({ii, jj});
        }
    }
}
 
void check(){
    vector<vector<int>>Dis(n, vector<int>(n, inf));
    Dis[Str[0]][Str[1]]=0;
    while(!qu.empty()){
        array<int, 2>u=qu.front();
        qu.pop();
        int i=u[0], j=u[1];
        if(Md+Dis[i][j]/s>=Pri[i][j]){
            continue;
        }
        if(i==End[0] && j==End[1]){
            can=1;
            continue;
        }
        
        for(int f=0;f<4;f++){
            int ii=i+dx[f], jj=j+dy[f];
            if(valid(ii, jj) && Dis[i][j]+1<Dis[ii][jj]){
                Dis[ii][jj]=Dis[i][j]+1, qu.push({ii, jj});
            }
        }
    }
}
int main(){
    ios_base::sync_with_stdio(0);cin.tie(0);
    cin>>n>>s;
    pre();
    for(int i=0;i<n;i++){
        cin>>A[i];
    }
    for(int i=0;i<n;i++){
        for(int j=0;j<n;j++){
            if(A[i][j]=='H')
                q.push({i, j}), Pri[i][j]=0;
            else if(A[i][j]=='M')
                Str[0]=i, Str[1]=j;
            else if(A[i][j]=='D')
                End[0]=i, End[1]=j;
            else if(A[i][j]=='T')
                Pri[i][j]=0;
        }
    }
    bfs();
    int l=0, r=n*n, ans=-1;
    while(l<=r){
        int md=(l+r)/2;
        Md=md;
        can=0;
        qu.push({Str[0], Str[1]});
        check();
        if(can)
            ans=md, l=md+1;
        else
            r=md-1;
    }
    cout<<ans; 
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 1 ms 344 KB Output is correct
6 Correct 0 ms 600 KB Output is correct
7 Correct 81 ms 6420 KB Output is correct
8 Correct 0 ms 344 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 1 ms 600 KB Output is correct
14 Correct 1 ms 344 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 0 ms 344 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 1 ms 348 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 1 ms 344 KB Output is correct
23 Correct 0 ms 348 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 0 ms 348 KB Output is correct
26 Correct 0 ms 600 KB Output is correct
27 Correct 0 ms 348 KB Output is correct
28 Correct 1 ms 420 KB Output is correct
29 Correct 0 ms 600 KB Output is correct
30 Correct 0 ms 348 KB Output is correct
31 Correct 0 ms 348 KB Output is correct
32 Correct 0 ms 344 KB Output is correct
33 Correct 5 ms 1568 KB Output is correct
34 Correct 5 ms 1572 KB Output is correct
35 Correct 20 ms 1584 KB Output is correct
36 Correct 7 ms 1884 KB Output is correct
37 Correct 7 ms 1896 KB Output is correct
38 Correct 24 ms 1884 KB Output is correct
39 Correct 8 ms 2348 KB Output is correct
40 Correct 10 ms 2268 KB Output is correct
41 Correct 37 ms 2360 KB Output is correct
42 Correct 10 ms 2780 KB Output is correct
43 Correct 11 ms 2776 KB Output is correct
44 Correct 41 ms 2788 KB Output is correct
45 Correct 12 ms 3180 KB Output is correct
46 Correct 13 ms 3192 KB Output is correct
47 Correct 52 ms 3200 KB Output is correct
48 Correct 14 ms 3780 KB Output is correct
49 Correct 17 ms 3772 KB Output is correct
50 Correct 55 ms 3740 KB Output is correct
51 Correct 23 ms 4328 KB Output is correct
52 Correct 20 ms 4188 KB Output is correct
53 Correct 75 ms 4184 KB Output is correct
54 Correct 20 ms 4912 KB Output is correct
55 Correct 22 ms 4920 KB Output is correct
56 Correct 84 ms 4904 KB Output is correct
57 Correct 22 ms 5576 KB Output is correct
58 Correct 26 ms 5572 KB Output is correct
59 Correct 96 ms 5548 KB Output is correct
60 Correct 26 ms 6268 KB Output is correct
61 Correct 33 ms 6260 KB Output is correct
62 Correct 109 ms 6236 KB Output is correct
63 Correct 103 ms 6228 KB Output is correct
64 Correct 193 ms 6232 KB Output is correct
65 Correct 146 ms 6216 KB Output is correct
66 Correct 120 ms 6224 KB Output is correct
67 Correct 117 ms 6472 KB Output is correct
68 Correct 49 ms 6300 KB Output is correct
69 Correct 50 ms 6284 KB Output is correct
70 Correct 38 ms 6260 KB Output is correct
71 Correct 45 ms 6292 KB Output is correct
72 Correct 33 ms 6288 KB Output is correct
73 Correct 36 ms 6256 KB Output is correct
74 Correct 49 ms 6276 KB Output is correct
75 Correct 62 ms 6288 KB Output is correct
76 Correct 54 ms 6292 KB Output is correct
77 Correct 60 ms 6252 KB Output is correct
78 Correct 63 ms 6260 KB Output is correct
79 Correct 48 ms 6316 KB Output is correct
80 Correct 55 ms 6552 KB Output is correct
81 Correct 57 ms 6248 KB Output is correct
82 Correct 51 ms 6292 KB Output is correct
83 Correct 63 ms 6284 KB Output is correct
84 Correct 57 ms 6264 KB Output is correct
85 Correct 69 ms 6336 KB Output is correct
86 Correct 61 ms 6308 KB Output is correct
87 Correct 61 ms 6256 KB Output is correct
88 Correct 74 ms 6268 KB Output is correct
89 Correct 84 ms 6276 KB Output is correct
90 Correct 74 ms 6380 KB Output is correct
91 Correct 66 ms 6304 KB Output is correct
92 Correct 71 ms 6292 KB Output is correct