#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define MAXN (1000005)
int main(){
ios_base::sync_with_stdio(false);cin.tie(0);
ll N,S;
cin>>N>>S;
pair<ll,ll> start = {-1,-1};
pair<ll,ll> end = {-1,-1};
char arr[N][N];
for(ll i = 0;i < N;i++){
for(ll j = 0;j < N;j++){
cin>>arr[i][j];
if(arr[i][j] == 'M') start = {i,j};
if(arr[i][j] == 'D') end = {i,j};
}
}
queue<pair<ll,ll> > q;
ll fromhive[N][N];
for(ll i = 0;i < N;i++){
for(ll j = 0;j < N;j++){
fromhive[i][j] = 1e18;
if(arr[i][j] == 'H'){
q.push({i,j});
fromhive[i][j] = 0;
}
}
}
int Hy[] = {0,0,-1,1};
int Wx[] = {-1,1,0,0};
while(!q.empty()){
ll y = q.front().first;
ll x = q.front().second;
q.pop();
for(ll i = 0;i < 4;i++){
ll a = y + Hy[i];
ll b = x + Wx[i];
if(a < 0 || a >= N || b < 0 || b >= N || arr[a][b] == 'T' || arr[a][b] == 'D'){
continue;
}
if(fromhive[a][b] == 1e18){
q.push({a,b});
fromhive[a][b] = fromhive[y][x] + 1;
}
}
}
/*cout<<"FROMHIVE: "<<'\n';
for(ll i = 0;i < N;i++){
for(ll j = 0;j < N;j++){
cout<<fromhive[i][j]<<" ";
}
cout<<'\n';
}*/
ll high = 1e6 + 5;
ll low = -1;
while(high - low > 1){
ll mid = (high + low) / 2;
ll dist[N][N];
memset(dist,-1,sizeof(dist));
q.push(start);
dist[start.first][start.second] = 0;
ll time = max(0ll,mid);
//cout<<"MID: "<<mid<<'\n';
ll add = 0;
while(true){
queue<pair<ll,ll> > newq;
while(!q.empty()){
ll y = q.front().first;
ll x = q.front().second;
q.pop();
for(ll i = 0;i < 4;i++){
ll a = y + Hy[i];
ll b = x + Wx[i];
if(a < 0 || a >= N || b < 0 || b >= N || arr[a][b] == 'T'){
continue;
}
if(dist[a][b] == -1 && dist[y][x] + 1 <= S + add && time < fromhive[a][b]){
dist[a][b] = dist[y][x] + 1;
if(dist[a][b] == S){
for(ll ind = 0;ind < 4;ind++){
ll aa = a + Hy[ind];
ll bb = b + Wx[ind];
if(aa < 0 || aa >= N || bb < 0 || bb >= N || arr[aa][bb] == 'T'){
continue;
}
if(dist[aa][bb] == -1 && time + 1 < fromhive[aa][bb]){
newq.push({a,b});
break;
}
}
}else{
q.push({a,b});
}
}
}
}
//cout<<"CURTIME: "<<time<<'\n';
/*if(mid == 2){
cout<<"DIST: "<<'\n';
for(ll ii = 0;ii < N;ii++){
for(ll jj = 0;jj < N;jj++){
cout<<dist[ii][jj]<<" ";
}
cout<<'\n';
}
cout<<'\n';
}*/
time++;
add += S;
while(!newq.empty()){
q.push(newq.front());
//if(mid == 2) cout<<"NEWQ: "<<newq.front().first<<" "<<newq.front().second<<'\n';
newq.pop();
}
if(q.empty()){
break;
}
}
if(dist[end.first][end.second] == -1){
high = mid;
}else{
low = mid;
}
}
cout<<low<<'\n';
}
/*
-1 -1 -1 -1 -1 -1 -1
-1 5 5 5 5 5 -1
-1 4 4 4 4 4 -1
4 3 3 3 3 3 4
-1 2 2 2 2 2 -1
-1 1 1 1 1 1 -1
-1 0 0 0 0 0 -1
*/
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
1 ms |
336 KB |
Output isn't correct |
| 2 |
Incorrect |
1 ms |
336 KB |
Output isn't correct |
| 3 |
Incorrect |
1 ms |
336 KB |
Output isn't correct |
| 4 |
Incorrect |
1 ms |
336 KB |
Output isn't correct |
| 5 |
Incorrect |
1 ms |
336 KB |
Output isn't correct |
| 6 |
Incorrect |
1 ms |
504 KB |
Output isn't correct |
| 7 |
Incorrect |
34 ms |
11080 KB |
Output isn't correct |
| 8 |
Correct |
1 ms |
336 KB |
Output is correct |
| 9 |
Correct |
1 ms |
336 KB |
Output is correct |
| 10 |
Incorrect |
1 ms |
336 KB |
Output isn't correct |
| 11 |
Incorrect |
1 ms |
336 KB |
Output isn't correct |
| 12 |
Incorrect |
1 ms |
336 KB |
Output isn't correct |
| 13 |
Incorrect |
1 ms |
500 KB |
Output isn't correct |
| 14 |
Correct |
1 ms |
336 KB |
Output is correct |
| 15 |
Incorrect |
1 ms |
336 KB |
Output isn't correct |
| 16 |
Correct |
1 ms |
336 KB |
Output is correct |
| 17 |
Incorrect |
1 ms |
336 KB |
Output isn't correct |
| 18 |
Correct |
1 ms |
336 KB |
Output is correct |
| 19 |
Incorrect |
1 ms |
336 KB |
Output isn't correct |
| 20 |
Correct |
1 ms |
336 KB |
Output is correct |
| 21 |
Incorrect |
1 ms |
504 KB |
Output isn't correct |
| 22 |
Correct |
2 ms |
336 KB |
Output is correct |
| 23 |
Incorrect |
1 ms |
336 KB |
Output isn't correct |
| 24 |
Correct |
1 ms |
336 KB |
Output is correct |
| 25 |
Incorrect |
1 ms |
336 KB |
Output isn't correct |
| 26 |
Correct |
1 ms |
336 KB |
Output is correct |
| 27 |
Incorrect |
1 ms |
336 KB |
Output isn't correct |
| 28 |
Correct |
1 ms |
336 KB |
Output is correct |
| 29 |
Incorrect |
1 ms |
336 KB |
Output isn't correct |
| 30 |
Correct |
1 ms |
336 KB |
Output is correct |
| 31 |
Incorrect |
1 ms |
336 KB |
Output isn't correct |
| 32 |
Correct |
1 ms |
336 KB |
Output is correct |
| 33 |
Incorrect |
5 ms |
2384 KB |
Output isn't correct |
| 34 |
Correct |
6 ms |
2384 KB |
Output is correct |
| 35 |
Incorrect |
12 ms |
2500 KB |
Output isn't correct |
| 36 |
Incorrect |
7 ms |
2896 KB |
Output isn't correct |
| 37 |
Correct |
8 ms |
2896 KB |
Output is correct |
| 38 |
Incorrect |
22 ms |
2896 KB |
Output isn't correct |
| 39 |
Incorrect |
9 ms |
3664 KB |
Output isn't correct |
| 40 |
Correct |
9 ms |
3664 KB |
Output is correct |
| 41 |
Incorrect |
22 ms |
3664 KB |
Output isn't correct |
| 42 |
Incorrect |
11 ms |
4604 KB |
Output isn't correct |
| 43 |
Correct |
10 ms |
4432 KB |
Output is correct |
| 44 |
Incorrect |
30 ms |
4432 KB |
Output isn't correct |
| 45 |
Incorrect |
13 ms |
5456 KB |
Output isn't correct |
| 46 |
Correct |
12 ms |
5424 KB |
Output is correct |
| 47 |
Incorrect |
33 ms |
5456 KB |
Output isn't correct |
| 48 |
Incorrect |
15 ms |
6224 KB |
Output isn't correct |
| 49 |
Correct |
13 ms |
6224 KB |
Output is correct |
| 50 |
Incorrect |
35 ms |
6444 KB |
Output isn't correct |
| 51 |
Incorrect |
17 ms |
7248 KB |
Output isn't correct |
| 52 |
Correct |
16 ms |
7248 KB |
Output is correct |
| 53 |
Incorrect |
44 ms |
7248 KB |
Output isn't correct |
| 54 |
Incorrect |
20 ms |
8528 KB |
Output isn't correct |
| 55 |
Correct |
20 ms |
8540 KB |
Output is correct |
| 56 |
Incorrect |
50 ms |
8372 KB |
Output isn't correct |
| 57 |
Incorrect |
23 ms |
9808 KB |
Output isn't correct |
| 58 |
Correct |
21 ms |
9808 KB |
Output is correct |
| 59 |
Incorrect |
61 ms |
9800 KB |
Output isn't correct |
| 60 |
Incorrect |
25 ms |
11088 KB |
Output isn't correct |
| 61 |
Correct |
23 ms |
10980 KB |
Output is correct |
| 62 |
Incorrect |
69 ms |
11088 KB |
Output isn't correct |
| 63 |
Incorrect |
32 ms |
11088 KB |
Output isn't correct |
| 64 |
Incorrect |
62 ms |
11092 KB |
Output isn't correct |
| 65 |
Incorrect |
32 ms |
11260 KB |
Output isn't correct |
| 66 |
Incorrect |
32 ms |
11232 KB |
Output isn't correct |
| 67 |
Correct |
32 ms |
11088 KB |
Output is correct |
| 68 |
Incorrect |
34 ms |
11080 KB |
Output isn't correct |
| 69 |
Incorrect |
37 ms |
11080 KB |
Output isn't correct |
| 70 |
Incorrect |
34 ms |
11088 KB |
Output isn't correct |
| 71 |
Incorrect |
36 ms |
11080 KB |
Output isn't correct |
| 72 |
Incorrect |
37 ms |
10984 KB |
Output isn't correct |
| 73 |
Incorrect |
38 ms |
11592 KB |
Output isn't correct |
| 74 |
Correct |
54 ms |
11472 KB |
Output is correct |
| 75 |
Incorrect |
33 ms |
11592 KB |
Output isn't correct |
| 76 |
Incorrect |
32 ms |
11600 KB |
Output isn't correct |
| 77 |
Incorrect |
33 ms |
11524 KB |
Output isn't correct |
| 78 |
Correct |
32 ms |
11592 KB |
Output is correct |
| 79 |
Correct |
48 ms |
11444 KB |
Output is correct |
| 80 |
Incorrect |
30 ms |
11592 KB |
Output isn't correct |
| 81 |
Incorrect |
33 ms |
11568 KB |
Output isn't correct |
| 82 |
Incorrect |
30 ms |
11600 KB |
Output isn't correct |
| 83 |
Incorrect |
30 ms |
11344 KB |
Output isn't correct |
| 84 |
Correct |
68 ms |
11364 KB |
Output is correct |
| 85 |
Incorrect |
32 ms |
11344 KB |
Output isn't correct |
| 86 |
Incorrect |
30 ms |
11372 KB |
Output isn't correct |
| 87 |
Incorrect |
30 ms |
11344 KB |
Output isn't correct |
| 88 |
Incorrect |
30 ms |
11344 KB |
Output isn't correct |
| 89 |
Correct |
67 ms |
11280 KB |
Output is correct |
| 90 |
Incorrect |
33 ms |
11336 KB |
Output isn't correct |
| 91 |
Incorrect |
35 ms |
11336 KB |
Output isn't correct |
| 92 |
Incorrect |
31 ms |
11336 KB |
Output isn't correct |
