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Submission #1072179

# Submission time Handle Problem Language Result Execution time Memory
1072179 2024-08-23T15:15:50 Z 7again Mecho (IOI09_mecho) C++17
98 / 100
 407 ms 6480 KB 
#include <bits/stdc++.h>

using namespace std ;

const int N = 801 ;
int dx[]{0 , 0 , 1 , -1} ;
int dy[]{1 , -1 , 0 , 0} ;


int n , s ;
pair <int , int> Honey , Home ;
char a[N][N] ;

bool inside(int x , int y) {
    return (x >= 0 && y >= 0 && x < n && y < n && (a[x][y] == 'G' || a[x][y] == 'M')) ;
}
bool val(int x , int y) {
    return  x / s < y ;
}
int ok(int time) {

    int mn2[n + 1][n + 1] ;
    fill_n(&mn2[0][0] , (n + 1) * (n + 1) , 1e9) ;
    queue<pair <int , int>>  q2 ;
    for(int i = 0 ; i < n ; i++) {
        for(int j = 0 ; j < n ; j++) {
            if(a[i][j] == 'H') {
                q2.push({i, j}) ;
                mn2[i][j] = 0 ;
            }
        }
    }
    while(q2.size()) {
        pair <int , int> t = q2.front() ;
        q2.pop() ;
        for(int i = 0 ; i < 4 ; i++) {
            int x = t.first + dx[i] ;
            int y = t.second + dy[i] ;
            if(inside(x , y) &&  mn2[t.first][t.second] + 1 < mn2[x][y]) {
                mn2[x][y] = mn2[t.first][t.second] + 1 ;
                q2.push({x, y}) ;
            }
        }
    }

    int mn[n + 1][n + 1] ;
    fill_n(&mn[0][0] , (n + 1) * (n + 1) , 1e9 ) ;
    queue <pair <int , int>> q ;
    mn[Honey.first][Honey.second] = 0 ;
    if(mn2[Honey.first][Honey.second] > time)
        q.push(Honey) ;
    while(!q.empty()) {
        pair <int , int> t = q.front() ;
        q.pop() ;
        for(int i = 0 ; i < 4 ; i++) {
            int x = t.first + dx[i] ;
            int y = t.second + dy[i] ;
            if(val(mn[t.first][t.second] + 1 , mn2[x][y] - time) && inside(x , y) && mn[t.first][t.second] + 1 < mn[x][y]) {
                mn[x][y] = mn[t.first][t.second] + 1 ;
                q.push({x , y}) ;
            }
        }
    }
    for(int i = 0 ; i < 4 ; i++){
        int x = Home.first + dx[i] ;
        int y = Home.second + dy[i] ;
        if(inside(x , y) && val(mn[x][y] , mn2[x][y]  - time))
            return true ;
    }

    return  false ;
}
int main() {
    cin >> n >> s ;

    for(int i = 0 ; i < n ; i++) {
        for(int j = 0 ; j < n ; j++) {
            cin >> a[i][j] ;
            if(a[i][j] == 'M')
                Honey = {i , j} ;
            if(a[i][j] == 'D')
                Home = {i , j} ;
        }
    }

    int l = 0 , r = n * n + 1 ;
    while(l <= r) {
        int m = (l + r) / 2 ;
        if(ok(m))
            l = m + 1 ;
        else
            r = m - 1 ;
    }
    cout << l - 1 << endl ;
}

Subtask #1
98.0 / 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 Incorrect 0 ms 348 KB Output isn't correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 288 ms 6176 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 2 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 1 ms 344 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 1 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 1 ms 344 KB Output is correct
22 Correct 1 ms 348 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 1 ms 348 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 1 ms 348 KB Output is correct
27 Correct 1 ms 516 KB Output is correct
28 Correct 1 ms 344 KB Output is correct
29 Correct 1 ms 348 KB Output is correct
30 Correct 2 ms 348 KB Output is correct
31 Correct 2 ms 348 KB Output is correct
32 Correct 1 ms 348 KB Output is correct
33 Correct 22 ms 1628 KB Output is correct
34 Correct 22 ms 1628 KB Output is correct
35 Correct 41 ms 1624 KB Output is correct
36 Correct 53 ms 1884 KB Output is correct
37 Correct 37 ms 1884 KB Output is correct
38 Correct 53 ms 1884 KB Output is correct
39 Correct 35 ms 2140 KB Output is correct
40 Correct 39 ms 2140 KB Output is correct
41 Correct 83 ms 2140 KB Output is correct
42 Correct 45 ms 2652 KB Output is correct
43 Correct 45 ms 2652 KB Output is correct
44 Correct 92 ms 2772 KB Output is correct
45 Correct 58 ms 3164 KB Output is correct
46 Correct 56 ms 3220 KB Output is correct
47 Correct 111 ms 3220 KB Output is correct
48 Correct 72 ms 3676 KB Output is correct
49 Correct 66 ms 3672 KB Output is correct
50 Correct 125 ms 3676 KB Output is correct
51 Correct 89 ms 4232 KB Output is correct
52 Correct 78 ms 4188 KB Output is correct
53 Correct 158 ms 4176 KB Output is correct
54 Correct 97 ms 4624 KB Output is correct
55 Correct 91 ms 4800 KB Output is correct
56 Correct 184 ms 4688 KB Output is correct
57 Correct 104 ms 5264 KB Output is correct
58 Correct 107 ms 5208 KB Output is correct
59 Correct 223 ms 5268 KB Output is correct
60 Correct 125 ms 5972 KB Output is correct
61 Correct 117 ms 5976 KB Output is correct
62 Correct 251 ms 5968 KB Output is correct
63 Correct 322 ms 5972 KB Output is correct
64 Correct 407 ms 6052 KB Output is correct
65 Correct 357 ms 5868 KB Output is correct
66 Correct 334 ms 6064 KB Output is correct
67 Correct 332 ms 6056 KB Output is correct
68 Correct 310 ms 5972 KB Output is correct
69 Correct 330 ms 5972 KB Output is correct
70 Correct 302 ms 6092 KB Output is correct
71 Correct 333 ms 5972 KB Output is correct
72 Correct 304 ms 5972 KB Output is correct
73 Correct 289 ms 6344 KB Output is correct
74 Correct 293 ms 6156 KB Output is correct
75 Correct 313 ms 6132 KB Output is correct
76 Correct 293 ms 6228 KB Output is correct
77 Correct 288 ms 6344 KB Output is correct
78 Correct 290 ms 6116 KB Output is correct
79 Correct 266 ms 6264 KB Output is correct
80 Correct 293 ms 6480 KB Output is correct
81 Correct 273 ms 6224 KB Output is correct
82 Correct 284 ms 6152 KB Output is correct
83 Correct 280 ms 6276 KB Output is correct
84 Correct 290 ms 6228 KB Output is correct
85 Correct 303 ms 6260 KB Output is correct
86 Correct 323 ms 6276 KB Output is correct
87 Correct 322 ms 6048 KB Output is correct
88 Correct 320 ms 6228 KB Output is correct
89 Correct 319 ms 6228 KB Output is correct
90 Correct 287 ms 6228 KB Output is correct
91 Correct 283 ms 6224 KB Output is correct
92 Correct 314 ms 6224 KB Output is correct