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Submission #1072222

# Submission time Handle Problem Language Result Execution time Memory
1072222 2024-08-23T15:44:04 Z 7again Mecho (IOI09_mecho) C++17
98 / 100
 461 ms 7008 KB 
#include <bits/stdc++.h>

using namespace std ;

const int N = 800 ;
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 + 4][n + 4] ;
    fill_n(&mn2[0][0] , (n + 4) * (n + 4) , 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 + 4][n + 4] ;
    fill_n(&mn[0][0] , (n + 4) * (n + 4) , 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 + 4 ;
    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 1 ms 596 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 0 ms 400 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 1 ms 348 KB Output is correct
7 Correct 306 ms 6588 KB Output is correct
8 Correct 1 ms 344 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 1 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 1 ms 344 KB Output is correct
16 Correct 1 ms 344 KB Output is correct
17 Correct 1 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 1 ms 344 KB Output is correct
21 Correct 1 ms 348 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 444 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 344 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 348 KB Output is correct
33 Correct 23 ms 1808 KB Output is correct
34 Correct 24 ms 1628 KB Output is correct
35 Correct 44 ms 1628 KB Output is correct
36 Correct 31 ms 1992 KB Output is correct
37 Correct 31 ms 2140 KB Output is correct
38 Correct 64 ms 2140 KB Output is correct
39 Correct 40 ms 2392 KB Output is correct
40 Correct 35 ms 2396 KB Output is correct
41 Correct 79 ms 2392 KB Output is correct
42 Correct 48 ms 2908 KB Output is correct
43 Correct 48 ms 3040 KB Output is correct
44 Correct 124 ms 2904 KB Output is correct
45 Correct 56 ms 3528 KB Output is correct
46 Correct 80 ms 3408 KB Output is correct
47 Correct 145 ms 3408 KB Output is correct
48 Correct 69 ms 3932 KB Output is correct
49 Correct 67 ms 3928 KB Output is correct
50 Correct 132 ms 4008 KB Output is correct
51 Correct 89 ms 4696 KB Output is correct
52 Correct 112 ms 4668 KB Output is correct
53 Correct 174 ms 4692 KB Output is correct
54 Correct 102 ms 5208 KB Output is correct
55 Correct 98 ms 5208 KB Output is correct
56 Correct 271 ms 5460 KB Output is correct
57 Correct 120 ms 5968 KB Output is correct
58 Correct 167 ms 6008 KB Output is correct
59 Correct 235 ms 6008 KB Output is correct
60 Correct 126 ms 6484 KB Output is correct
61 Correct 194 ms 6480 KB Output is correct
62 Correct 357 ms 6728 KB Output is correct
63 Correct 371 ms 6532 KB Output is correct
64 Correct 449 ms 6480 KB Output is correct
65 Correct 430 ms 6720 KB Output is correct
66 Correct 417 ms 6484 KB Output is correct
67 Correct 390 ms 6488 KB Output is correct
68 Correct 362 ms 6748 KB Output is correct
69 Correct 426 ms 6756 KB Output is correct
70 Correct 392 ms 6600 KB Output is correct
71 Correct 388 ms 6748 KB Output is correct
72 Correct 348 ms 6616 KB Output is correct
73 Correct 332 ms 7000 KB Output is correct
74 Correct 372 ms 6832 KB Output is correct
75 Correct 461 ms 7008 KB Output is correct
76 Correct 379 ms 7000 KB Output is correct
77 Correct 369 ms 7004 KB Output is correct
78 Correct 378 ms 6976 KB Output is correct
79 Correct 321 ms 7004 KB Output is correct
80 Correct 320 ms 6980 KB Output is correct
81 Correct 300 ms 6832 KB Output is correct
82 Correct 290 ms 6980 KB Output is correct
83 Correct 341 ms 6936 KB Output is correct
84 Correct 334 ms 6712 KB Output is correct
85 Correct 329 ms 6740 KB Output is correct
86 Correct 295 ms 6932 KB Output is correct
87 Correct 303 ms 6932 KB Output is correct
88 Correct 343 ms 6892 KB Output is correct
89 Correct 300 ms 6740 KB Output is correct
90 Correct 340 ms 6736 KB Output is correct
91 Correct 288 ms 6740 KB Output is correct
92 Correct 318 ms 6740 KB Output is correct