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Submission #1072189

# Submission time Handle Problem Language Result Execution time Memory
1072189 2024-08-23T15:21:30 Z 7again Mecho (IOI09_mecho) C++17
98 / 100
 405 ms 6336 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 ;
    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 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 277 ms 5968 KB Output is correct
8 Correct 0 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 0 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 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 0 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 1 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 0 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 348 KB Output is correct
30 Correct 1 ms 348 KB Output is correct
31 Correct 1 ms 344 KB Output is correct
32 Correct 1 ms 348 KB Output is correct
33 Correct 27 ms 1668 KB Output is correct
34 Correct 20 ms 1676 KB Output is correct
35 Correct 40 ms 1624 KB Output is correct
36 Correct 27 ms 2136 KB Output is correct
37 Correct 27 ms 1884 KB Output is correct
38 Correct 52 ms 1884 KB Output is correct
39 Correct 34 ms 2140 KB Output is correct
40 Correct 35 ms 2140 KB Output is correct
41 Correct 71 ms 2360 KB Output is correct
42 Correct 44 ms 2652 KB Output is correct
43 Correct 42 ms 2772 KB Output is correct
44 Correct 88 ms 2776 KB Output is correct
45 Correct 59 ms 3160 KB Output is correct
46 Correct 52 ms 3164 KB Output is correct
47 Correct 103 ms 3220 KB Output is correct
48 Correct 63 ms 3712 KB Output is correct
49 Correct 63 ms 3708 KB Output is correct
50 Correct 125 ms 3676 KB Output is correct
51 Correct 77 ms 4188 KB Output is correct
52 Correct 76 ms 4188 KB Output is correct
53 Correct 152 ms 4188 KB Output is correct
54 Correct 88 ms 4808 KB Output is correct
55 Correct 87 ms 4808 KB Output is correct
56 Correct 184 ms 4696 KB Output is correct
57 Correct 102 ms 5212 KB Output is correct
58 Correct 100 ms 5412 KB Output is correct
59 Correct 203 ms 5424 KB Output is correct
60 Correct 120 ms 5968 KB Output is correct
61 Correct 113 ms 6060 KB Output is correct
62 Correct 234 ms 6060 KB Output is correct
63 Correct 326 ms 5968 KB Output is correct
64 Correct 405 ms 5968 KB Output is correct
65 Correct 345 ms 5868 KB Output is correct
66 Correct 329 ms 5996 KB Output is correct
67 Correct 315 ms 5972 KB Output is correct
68 Correct 321 ms 5968 KB Output is correct
69 Correct 333 ms 5980 KB Output is correct
70 Correct 300 ms 6096 KB Output is correct
71 Correct 321 ms 6048 KB Output is correct
72 Correct 288 ms 5968 KB Output is correct
73 Correct 265 ms 6236 KB Output is correct
74 Correct 281 ms 6236 KB Output is correct
75 Correct 319 ms 6228 KB Output is correct
76 Correct 353 ms 6336 KB Output is correct
77 Correct 306 ms 6228 KB Output is correct
78 Correct 277 ms 6312 KB Output is correct
79 Correct 258 ms 6224 KB Output is correct
80 Correct 272 ms 6224 KB Output is correct
81 Correct 272 ms 6224 KB Output is correct
82 Correct 280 ms 6224 KB Output is correct
83 Correct 282 ms 6228 KB Output is correct
84 Correct 271 ms 6224 KB Output is correct
85 Correct 293 ms 6224 KB Output is correct
86 Correct 278 ms 6276 KB Output is correct
87 Correct 274 ms 6228 KB Output is correct
88 Correct 277 ms 6220 KB Output is correct
89 Correct 281 ms 6128 KB Output is correct
90 Correct 282 ms 6228 KB Output is correct
91 Correct 280 ms 6036 KB Output is correct
92 Correct 291 ms 6224 KB Output is correct