/* Author : Mychecksdead */
#include<bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;
typedef long long int ll;
typedef long double ld;
#define MOD (1000000000+7)
#define MOD1 (998244353)
#define PI 3.1415926535
#define pb push_back
#define setp() cout << setprecision(15)
#define all(x) x.begin(), x.end()
#define debug(x) cerr << #x << " is " << x << '\n';
const int N = 1e6+100, M = 1e5+10, F = 2147483646, K = 20;
int n, S, ax, ay, bx, by, dist[1000][1000], d[1000][1000], arr[4][2] = {{0, 1}, {0, -1}, {1, 0}, {-1, 0}};
string s[N];
bool vis[1000][1000];
void solve(){
cin >> n >> S;
queue<array<int, 2>> q, q1;
for(int i = 0; i < n; ++i){
cin >> s[i];
for(int j = 0; j < n; ++j){
dist[i][j] = d[i][j] = MOD;
if(s[i][j] == 'H') q.push({i, j}), dist[i][j] = 0;
else if(s[i][j] == 'M') q1.push({i, j}), d[i][j] = 0, bx = i, by = j;
else if(s[i][j] == 'D') ax = i, ay = j;
}
}
while(!q.empty()){
int x = q.front()[0], y = q.front()[1];
q.pop();
for(int i = 0; i < 4; ++i){
int a = x + arr[i][0];
int b = y + arr[i][1];
if(a>=0&&a<n&&b>=0&&b<n&&s[a][b]=='D'){
dist[a][b] = min(dist[a][b], dist[x][y] + 1);
}
if(a<0||b<0||a==n||b==n||(s[a][b]!='G'&&s[a][b]!='M')) continue;
if(dist[a][b] > dist[x][y] + 1) {
dist[a][b] = dist[x][y] + 1;
q.push({a, b});
}
}
}
while(!q1.empty()){
int x = q1.front()[0], y = q1.front()[1];
q1.pop();
for(int i = 0; i < 4; ++i){
for(int f = 1; f <= S; ++f){
int a = x + f * arr[i][0];
int b = y + f * arr[i][1];
if(a<0||b<0||a>=n||b>=n||(s[a][b]!='G'&&s[a][b]!='M'&&s[a][b]!='D')||d[a][b] < d[x][y] + 1) break;
d[a][b] = d[x][y] + 1;
q1.push({a, b});
}
}
}
int l = 0, r = n*n, ans = -1;
while(l <= r){
int m = (l+r)>>1;
bool ok = 0;
for(int i = 0; i < n; ++i) for(int j = 0; j < n; ++j) vis[i][j] = 0;
q.push({ax, ay});
vis[ax][ay] = 1;
while(!q.empty()){
int x = q.front()[0], y = q.front()[1];
q.pop();
if(dist[x][y] - m <= d[x][y]){
continue;
}
if(x == bx && y == by){
ok = 1;
break;
}
for(int i = 0; i < 4; ++i){
for(int f = 1; f <= S; ++f){
int a = x + f * arr[i][0];
int b = y + f * arr[i][1];
if(a<0||b<0||a>=n||b>=n||(s[a][b]!='G'&&s[a][b]!='M')||vis[a][b]) break;
vis[a][b] = 1;
q.push({a, b});
}
}
}
if(ok){
ans = m;
l = m + 1;
}else r = m - 1;
}
cout << ans;
}
int main(){
cin.tie(0); ios::sync_with_stdio(0);
int T = 1, aa;
// cin >> T;aa=T;
while(T--){
// cout << "Case #" << aa-T << ": ";
solve();
cout << '\n';
}
return 0;
}
Compilation message
mecho.cpp: In function 'int main()':
mecho.cpp:105:16: warning: unused variable 'aa' [-Wunused-variable]
105 | int T = 1, aa;
| ^~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
19 ms |
31580 KB |
Output is correct |
| 2 |
Incorrect |
15 ms |
31640 KB |
Output isn't correct |
| 3 |
Correct |
16 ms |
31636 KB |
Output is correct |
| 4 |
Incorrect |
16 ms |
31700 KB |
Output isn't correct |
| 5 |
Incorrect |
16 ms |
31612 KB |
Output isn't correct |
| 6 |
Incorrect |
15 ms |
31700 KB |
Output isn't correct |
| 7 |
Runtime error |
171 ms |
65536 KB |
Execution killed with signal 9 |
| 8 |
Runtime error |
202 ms |
65536 KB |
Execution killed with signal 9 |
| 9 |
Correct |
17 ms |
31788 KB |
Output is correct |
| 10 |
Incorrect |
17 ms |
31784 KB |
Output isn't correct |
| 11 |
Correct |
16 ms |
31700 KB |
Output is correct |
| 12 |
Incorrect |
18 ms |
32100 KB |
Output isn't correct |
| 13 |
Correct |
16 ms |
32092 KB |
Output is correct |
| 14 |
Correct |
26 ms |
32508 KB |
Output is correct |
| 15 |
Correct |
16 ms |
31700 KB |
Output is correct |
| 16 |
Correct |
16 ms |
31828 KB |
Output is correct |
| 17 |
Correct |
15 ms |
31828 KB |
Output is correct |
| 18 |
Incorrect |
16 ms |
31764 KB |
Output isn't correct |
| 19 |
Correct |
16 ms |
31828 KB |
Output is correct |
| 20 |
Correct |
15 ms |
31836 KB |
Output is correct |
| 21 |
Correct |
16 ms |
31956 KB |
Output is correct |
| 22 |
Incorrect |
16 ms |
31956 KB |
Output isn't correct |
| 23 |
Correct |
16 ms |
32084 KB |
Output is correct |
| 24 |
Incorrect |
16 ms |
32084 KB |
Output isn't correct |
| 25 |
Correct |
19 ms |
32176 KB |
Output is correct |
| 26 |
Incorrect |
17 ms |
32080 KB |
Output isn't correct |
| 27 |
Correct |
16 ms |
32212 KB |
Output is correct |
| 28 |
Incorrect |
16 ms |
32212 KB |
Output isn't correct |
| 29 |
Correct |
16 ms |
32340 KB |
Output is correct |
| 30 |
Incorrect |
16 ms |
32260 KB |
Output isn't correct |
| 31 |
Correct |
16 ms |
32272 KB |
Output is correct |
| 32 |
Incorrect |
16 ms |
32212 KB |
Output isn't correct |
| 33 |
Correct |
20 ms |
34848 KB |
Output is correct |
| 34 |
Correct |
21 ms |
34768 KB |
Output is correct |
| 35 |
Incorrect |
30 ms |
35520 KB |
Output isn't correct |
| 36 |
Correct |
23 ms |
35316 KB |
Output is correct |
| 37 |
Incorrect |
29 ms |
35288 KB |
Output isn't correct |
| 38 |
Incorrect |
33 ms |
36276 KB |
Output isn't correct |
| 39 |
Correct |
23 ms |
35796 KB |
Output is correct |
| 40 |
Incorrect |
25 ms |
35828 KB |
Output isn't correct |
| 41 |
Correct |
31 ms |
37112 KB |
Output is correct |
| 42 |
Correct |
24 ms |
36308 KB |
Output is correct |
| 43 |
Correct |
25 ms |
36272 KB |
Output is correct |
| 44 |
Incorrect |
32 ms |
37780 KB |
Output isn't correct |
| 45 |
Correct |
33 ms |
36692 KB |
Output is correct |
| 46 |
Correct |
34 ms |
36756 KB |
Output is correct |
| 47 |
Incorrect |
36 ms |
38612 KB |
Output isn't correct |
| 48 |
Correct |
27 ms |
37224 KB |
Output is correct |
| 49 |
Incorrect |
29 ms |
37244 KB |
Output isn't correct |
| 50 |
Incorrect |
41 ms |
39452 KB |
Output isn't correct |
| 51 |
Correct |
28 ms |
37716 KB |
Output is correct |
| 52 |
Correct |
35 ms |
37848 KB |
Output is correct |
| 53 |
Correct |
48 ms |
40416 KB |
Output is correct |
| 54 |
Correct |
35 ms |
38220 KB |
Output is correct |
| 55 |
Correct |
34 ms |
38288 KB |
Output is correct |
| 56 |
Incorrect |
50 ms |
41296 KB |
Output isn't correct |
| 57 |
Correct |
34 ms |
38732 KB |
Output is correct |
| 58 |
Incorrect |
33 ms |
38760 KB |
Output isn't correct |
| 59 |
Incorrect |
51 ms |
41428 KB |
Output isn't correct |
| 60 |
Correct |
36 ms |
39244 KB |
Output is correct |
| 61 |
Correct |
41 ms |
39340 KB |
Output is correct |
| 62 |
Incorrect |
61 ms |
42400 KB |
Output isn't correct |
| 63 |
Incorrect |
78 ms |
39304 KB |
Output isn't correct |
| 64 |
Incorrect |
145 ms |
39348 KB |
Output isn't correct |
| 65 |
Incorrect |
157 ms |
39364 KB |
Output isn't correct |
| 66 |
Incorrect |
93 ms |
39280 KB |
Output isn't correct |
| 67 |
Correct |
59 ms |
39348 KB |
Output is correct |
| 68 |
Incorrect |
57 ms |
39480 KB |
Output isn't correct |
| 69 |
Incorrect |
60 ms |
39492 KB |
Output isn't correct |
| 70 |
Incorrect |
58 ms |
39364 KB |
Output isn't correct |
| 71 |
Incorrect |
70 ms |
39360 KB |
Output isn't correct |
| 72 |
Correct |
69 ms |
39372 KB |
Output is correct |
| 73 |
Runtime error |
191 ms |
65536 KB |
Execution killed with signal 9 |
| 74 |
Incorrect |
99 ms |
43288 KB |
Output isn't correct |
| 75 |
Runtime error |
181 ms |
65536 KB |
Execution killed with signal 9 |
| 76 |
Runtime error |
192 ms |
65536 KB |
Execution killed with signal 9 |
| 77 |
Runtime error |
228 ms |
65536 KB |
Execution killed with signal 9 |
| 78 |
Runtime error |
208 ms |
65536 KB |
Execution killed with signal 9 |
| 79 |
Incorrect |
87 ms |
43060 KB |
Output isn't correct |
| 80 |
Runtime error |
239 ms |
65536 KB |
Execution killed with signal 9 |
| 81 |
Runtime error |
176 ms |
65536 KB |
Execution killed with signal 9 |
| 82 |
Runtime error |
210 ms |
65536 KB |
Execution killed with signal 9 |
| 83 |
Runtime error |
216 ms |
65536 KB |
Execution killed with signal 9 |
| 84 |
Incorrect |
105 ms |
42724 KB |
Output isn't correct |
| 85 |
Runtime error |
216 ms |
65536 KB |
Execution killed with signal 9 |
| 86 |
Runtime error |
204 ms |
65536 KB |
Execution killed with signal 9 |
| 87 |
Runtime error |
447 ms |
65536 KB |
Execution killed with signal 9 |
| 88 |
Runtime error |
225 ms |
65536 KB |
Execution killed with signal 9 |
| 89 |
Incorrect |
125 ms |
43612 KB |
Output isn't correct |
| 90 |
Runtime error |
246 ms |
65536 KB |
Execution killed with signal 9 |
| 91 |
Incorrect |
196 ms |
43560 KB |
Output isn't correct |
| 92 |
Runtime error |
238 ms |
65536 KB |
Execution killed with signal 9 |
