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Submission #1072233

# Submission time Handle Problem Language Result Execution time Memory
1072233 2024-08-23T15:50:14 Z 7again Mecho (IOI09_mecho) C++14
98 / 100
 397 ms 6384 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 + 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 0 ms 344 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 278 ms 6008 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 1 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 1 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 2 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 348 KB Output is correct
32 Correct 1 ms 348 KB Output is correct
33 Correct 21 ms 1684 KB Output is correct
34 Correct 20 ms 1628 KB Output is correct
35 Correct 42 ms 1628 KB Output is correct
36 Correct 27 ms 1880 KB Output is correct
37 Correct 28 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 2396 KB Output is correct
41 Correct 75 ms 2136 KB Output is correct
42 Correct 54 ms 2904 KB Output is correct
43 Correct 44 ms 2648 KB Output is correct
44 Correct 94 ms 2652 KB Output is correct
45 Correct 53 ms 3164 KB Output is correct
46 Correct 54 ms 3240 KB Output is correct
47 Correct 103 ms 3164 KB Output is correct
48 Correct 67 ms 3676 KB Output is correct
49 Correct 61 ms 3672 KB Output is correct
50 Correct 122 ms 3672 KB Output is correct
51 Correct 78 ms 4128 KB Output is correct
52 Correct 75 ms 4152 KB Output is correct
53 Correct 154 ms 4276 KB Output is correct
54 Correct 92 ms 4652 KB Output is correct
55 Correct 85 ms 4644 KB Output is correct
56 Correct 182 ms 4696 KB Output is correct
57 Correct 132 ms 5464 KB Output is correct
58 Correct 101 ms 5244 KB Output is correct
59 Correct 213 ms 5468 KB Output is correct
60 Correct 133 ms 5980 KB Output is correct
61 Correct 114 ms 5856 KB Output is correct
62 Correct 241 ms 5980 KB Output is correct
63 Correct 313 ms 6096 KB Output is correct
64 Correct 397 ms 6124 KB Output is correct
65 Correct 341 ms 5972 KB Output is correct
66 Correct 336 ms 5968 KB Output is correct
67 Correct 326 ms 5968 KB Output is correct
68 Correct 318 ms 6124 KB Output is correct
69 Correct 318 ms 6128 KB Output is correct
70 Correct 316 ms 5968 KB Output is correct
71 Correct 360 ms 5904 KB Output is correct
72 Correct 301 ms 6124 KB Output is correct
73 Correct 286 ms 6148 KB Output is correct
74 Correct 326 ms 6384 KB Output is correct
75 Correct 325 ms 6384 KB Output is correct
76 Correct 333 ms 6368 KB Output is correct
77 Correct 385 ms 6376 KB Output is correct
78 Correct 299 ms 6352 KB Output is correct
79 Correct 282 ms 6356 KB Output is correct
80 Correct 301 ms 6352 KB Output is correct
81 Correct 282 ms 6228 KB Output is correct
82 Correct 305 ms 6356 KB Output is correct
83 Correct 310 ms 6104 KB Output is correct
84 Correct 282 ms 6232 KB Output is correct
85 Correct 333 ms 6224 KB Output is correct
86 Correct 302 ms 6312 KB Output is correct
87 Correct 298 ms 6228 KB Output is correct
88 Correct 281 ms 6264 KB Output is correct
89 Correct 279 ms 6268 KB Output is correct
90 Correct 310 ms 6260 KB Output is correct
91 Correct 288 ms 6240 KB Output is correct
92 Correct 299 ms 6224 KB Output is correct