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Submission #1072194

# Submission time Handle Problem Language Result Execution time Memory
1072194 2024-08-23T15:28:57 Z 7again Mecho (IOI09_mecho) C++17
98 / 100
 378 ms 6484 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() {
    ios_base::sync_with_stdio(0) ;
    cin.tie(0) ;
    
    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 + 777 ;
    while(l <= r) {
        int m = (l + r) / 2 ;
        if(ok(m))
            l = m + 1 ;
        else
            r = m - 1 ;
    }
    cout << l - 1 << "\n" ;
}

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 1 ms 596 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 282 ms 6196 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 1 ms 344 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 344 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 1 ms 348 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 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 0 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 348 KB Output is correct
28 Correct 1 ms 348 KB Output is correct
29 Correct 1 ms 548 KB Output is correct
30 Correct 1 ms 348 KB Output is correct
31 Correct 1 ms 348 KB Output is correct
32 Correct 1 ms 344 KB Output is correct
33 Correct 19 ms 1628 KB Output is correct
34 Correct 18 ms 1628 KB Output is correct
35 Correct 38 ms 1628 KB Output is correct
36 Correct 27 ms 1880 KB Output is correct
37 Correct 25 ms 1880 KB Output is correct
38 Correct 49 ms 1884 KB Output is correct
39 Correct 31 ms 2392 KB Output is correct
40 Correct 30 ms 2396 KB Output is correct
41 Correct 67 ms 2648 KB Output is correct
42 Correct 40 ms 2652 KB Output is correct
43 Correct 46 ms 2652 KB Output is correct
44 Correct 83 ms 2804 KB Output is correct
45 Correct 47 ms 3164 KB Output is correct
46 Correct 47 ms 3160 KB Output is correct
47 Correct 98 ms 3108 KB Output is correct
48 Correct 60 ms 3676 KB Output is correct
49 Correct 58 ms 3672 KB Output is correct
50 Correct 129 ms 3672 KB Output is correct
51 Correct 77 ms 4188 KB Output is correct
52 Correct 68 ms 4184 KB Output is correct
53 Correct 144 ms 4184 KB Output is correct
54 Correct 81 ms 4828 KB Output is correct
55 Correct 78 ms 4836 KB Output is correct
56 Correct 168 ms 4700 KB Output is correct
57 Correct 90 ms 5208 KB Output is correct
58 Correct 88 ms 5212 KB Output is correct
59 Correct 190 ms 5468 KB Output is correct
60 Correct 103 ms 5980 KB Output is correct
61 Correct 107 ms 5976 KB Output is correct
62 Correct 223 ms 6084 KB Output is correct
63 Correct 299 ms 6064 KB Output is correct
64 Correct 378 ms 5976 KB Output is correct
65 Correct 331 ms 5968 KB Output is correct
66 Correct 314 ms 5968 KB Output is correct
67 Correct 305 ms 5972 KB Output is correct
68 Correct 292 ms 5976 KB Output is correct
69 Correct 302 ms 5972 KB Output is correct
70 Correct 283 ms 5968 KB Output is correct
71 Correct 303 ms 5980 KB Output is correct
72 Correct 279 ms 6116 KB Output is correct
73 Correct 264 ms 6228 KB Output is correct
74 Correct 266 ms 6232 KB Output is correct
75 Correct 307 ms 6224 KB Output is correct
76 Correct 273 ms 6236 KB Output is correct
77 Correct 282 ms 6224 KB Output is correct
78 Correct 268 ms 6344 KB Output is correct
79 Correct 253 ms 6340 KB Output is correct
80 Correct 262 ms 6232 KB Output is correct
81 Correct 259 ms 6232 KB Output is correct
82 Correct 257 ms 6236 KB Output is correct
83 Correct 275 ms 6480 KB Output is correct
84 Correct 264 ms 6304 KB Output is correct
85 Correct 292 ms 6296 KB Output is correct
86 Correct 263 ms 6236 KB Output is correct
87 Correct 287 ms 6300 KB Output is correct
88 Correct 274 ms 6232 KB Output is correct
89 Correct 269 ms 6484 KB Output is correct
90 Correct 270 ms 6232 KB Output is correct
91 Correct 269 ms 6236 KB Output is correct
92 Correct 282 ms 6232 KB Output is correct