#include<bits/stdc++.h>
#define int long long
using namespace std;
const int inf=INT_MAX;
int n,s;
bool safe(int i,int j){
return i>=0 && i<n && j>=0 && j<n;
}
int di[4]={0,0,-1,1};
int dj[4]={1,-1,0,0};
int32_t main(){
ios_base::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
cin>>n>>s;
char mat[n][n];
int dist1[n][n];
int dist2[n][n];
int homex,homey;
//vector<pair<int,int>>hives;
int honx,hony;
queue<pair<int,int>>q;
bool vis1[n][n];
bool vis2[n][n];
for(int i=0;i<n;i++){
for(int j=0;j<n;j++){
vis1[i][j]=false;
vis2[i][j]=false;
dist1[i][j]=inf;
dist2[i][j]=inf;
}
}
for(int i=0;i<n;i++){
for(int j=0;j<n;j++){
cin>>mat[i][j];
if(mat[i][j]=='M'){
honx=i;
hony=j;
}
if(mat[i][j]=='D'){
homex=i;
homey=j;
}
if(mat[i][j]=='H'){
q.push({i,j});
dist1[i][j]=0;
vis1[i][j]=true;
}
}
}
while(!q.empty()){
const auto &[i,j]=q.front();
q.pop();
for(int l=0;l<4;l++){
int x=i+di[l];
int y=j+dj[l];
if(safe(x,y) && !vis1[x][y] && (mat[x][y]=='G'||mat[x][y]=='M')){
dist1[x][y]=dist1[i][j]+1;
vis1[x][y]=true;
q.push({x,y});
}
}
}
bool reached=false;
int ll=0,rr=1e6;
while(ll+1<rr){
int mid=(ll+rr)/2;
for(int i=0;i<n;i++){
for(int j=0;j<n;j++){
vis2[i][j]=false;
dist2[i][j]=inf;
}
}
dist2[honx][hony]=mid;
if(dist2[honx][hony]<dist1[honx][hony]){
vis2[honx][hony]=true;
q.push({honx,hony});
}
while(!q.empty()){
const auto &[i,j]=q.front();
q.pop();
for(int l=0;l<4;l++){
int x=i+di[l];
int y=j+dj[l];
if(safe(x,y) && (mat[x][y]=='G'|| mat[x][y]=='D')&& !vis2[x][y] && (((dist2[i][j]+1)/s)<dist1[x][y])){
dist2[x][y]=dist2[i][j]+1;
vis2[x][y]=true;
q.push({x,y});
}
}
}
if(dist2[homex][homey]<inf){
reached=true;
ll=mid;
}
else{
rr=mid;
}
}
if(reached){
cout<<ll-2<<endl;
}
else{
cout<<-1<<endl;
}
}
Compilation message
mecho.cpp: In function 'int32_t main()':
mecho.cpp:53:21: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
53 | const auto &[i,j]=q.front();
| ^
mecho.cpp:82:21: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
82 | const auto &[i,j]=q.front();
| ^
mecho.cpp:76:26: warning: 'hony' may be used uninitialized in this function [-Wmaybe-uninitialized]
76 | dist2[honx][hony]=mid;
| ~~~~~~~~~~~~~~~~~^~~~
mecho.cpp:76:26: warning: 'honx' may be used uninitialized in this function [-Wmaybe-uninitialized]
mecho.cpp:96:26: warning: 'homex' may be used uninitialized in this function [-Wmaybe-uninitialized]
96 | if(dist2[homex][homey]<inf){
| ~~~~~~~~~~~~~~~~~~^
mecho.cpp:96:26: warning: 'homey' may be used uninitialized in this function [-Wmaybe-uninitialized]
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
0 ms |
344 KB |
Output isn't correct |
| 2 |
Incorrect |
0 ms |
600 KB |
Output isn't correct |
| 3 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
| 4 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
| 5 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
| 6 |
Correct |
0 ms |
348 KB |
Output is correct |
| 7 |
Incorrect |
66 ms |
13148 KB |
Output isn't correct |
| 8 |
Correct |
0 ms |
348 KB |
Output is correct |
| 9 |
Incorrect |
1 ms |
348 KB |
Output isn't correct |
| 10 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
| 11 |
Correct |
0 ms |
344 KB |
Output is correct |
| 12 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
| 13 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
| 14 |
Correct |
1 ms |
344 KB |
Output is correct |
| 15 |
Incorrect |
1 ms |
344 KB |
Output isn't correct |
| 16 |
Incorrect |
0 ms |
600 KB |
Output isn't correct |
| 17 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
| 18 |
Incorrect |
1 ms |
348 KB |
Output isn't correct |
| 19 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
| 20 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
| 21 |
Incorrect |
0 ms |
344 KB |
Output isn't correct |
| 22 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
| 23 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
| 24 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
| 25 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
| 26 |
Incorrect |
1 ms |
348 KB |
Output isn't correct |
| 27 |
Incorrect |
0 ms |
464 KB |
Output isn't correct |
| 28 |
Incorrect |
1 ms |
348 KB |
Output isn't correct |
| 29 |
Incorrect |
1 ms |
348 KB |
Output isn't correct |
| 30 |
Incorrect |
1 ms |
456 KB |
Output isn't correct |
| 31 |
Incorrect |
1 ms |
348 KB |
Output isn't correct |
| 32 |
Incorrect |
1 ms |
348 KB |
Output isn't correct |
| 33 |
Incorrect |
5 ms |
2852 KB |
Output isn't correct |
| 34 |
Incorrect |
15 ms |
2648 KB |
Output isn't correct |
| 35 |
Incorrect |
12 ms |
2652 KB |
Output isn't correct |
| 36 |
Incorrect |
6 ms |
3420 KB |
Output isn't correct |
| 37 |
Incorrect |
16 ms |
3672 KB |
Output isn't correct |
| 38 |
Incorrect |
17 ms |
3416 KB |
Output isn't correct |
| 39 |
Incorrect |
9 ms |
4408 KB |
Output isn't correct |
| 40 |
Incorrect |
22 ms |
4188 KB |
Output isn't correct |
| 41 |
Incorrect |
25 ms |
4188 KB |
Output isn't correct |
| 42 |
Incorrect |
10 ms |
5212 KB |
Output isn't correct |
| 43 |
Incorrect |
39 ms |
5192 KB |
Output isn't correct |
| 44 |
Incorrect |
25 ms |
5212 KB |
Output isn't correct |
| 45 |
Incorrect |
11 ms |
6236 KB |
Output isn't correct |
| 46 |
Incorrect |
33 ms |
6236 KB |
Output isn't correct |
| 47 |
Incorrect |
27 ms |
6368 KB |
Output isn't correct |
| 48 |
Incorrect |
13 ms |
7260 KB |
Output isn't correct |
| 49 |
Incorrect |
49 ms |
7260 KB |
Output isn't correct |
| 50 |
Incorrect |
45 ms |
7492 KB |
Output isn't correct |
| 51 |
Incorrect |
17 ms |
8696 KB |
Output isn't correct |
| 52 |
Incorrect |
50 ms |
8540 KB |
Output isn't correct |
| 53 |
Incorrect |
62 ms |
8716 KB |
Output isn't correct |
| 54 |
Incorrect |
20 ms |
9820 KB |
Output isn't correct |
| 55 |
Incorrect |
68 ms |
9820 KB |
Output isn't correct |
| 56 |
Incorrect |
46 ms |
10028 KB |
Output isn't correct |
| 57 |
Incorrect |
20 ms |
11356 KB |
Output isn't correct |
| 58 |
Incorrect |
70 ms |
11352 KB |
Output isn't correct |
| 59 |
Incorrect |
61 ms |
11356 KB |
Output isn't correct |
| 60 |
Incorrect |
23 ms |
12840 KB |
Output isn't correct |
| 61 |
Incorrect |
63 ms |
12844 KB |
Output isn't correct |
| 62 |
Incorrect |
75 ms |
13216 KB |
Output isn't correct |
| 63 |
Incorrect |
86 ms |
12892 KB |
Output isn't correct |
| 64 |
Incorrect |
117 ms |
12984 KB |
Output isn't correct |
| 65 |
Incorrect |
149 ms |
12892 KB |
Output isn't correct |
| 66 |
Incorrect |
129 ms |
13140 KB |
Output isn't correct |
| 67 |
Correct |
98 ms |
12892 KB |
Output is correct |
| 68 |
Incorrect |
59 ms |
13020 KB |
Output isn't correct |
| 69 |
Incorrect |
49 ms |
12888 KB |
Output isn't correct |
| 70 |
Incorrect |
41 ms |
12892 KB |
Output isn't correct |
| 71 |
Incorrect |
42 ms |
12892 KB |
Output isn't correct |
| 72 |
Incorrect |
54 ms |
12888 KB |
Output isn't correct |
| 73 |
Runtime error |
37 ms |
26152 KB |
Execution killed with signal 11 |
| 74 |
Runtime error |
36 ms |
26288 KB |
Execution killed with signal 11 |
| 75 |
Incorrect |
57 ms |
13404 KB |
Output isn't correct |
| 76 |
Incorrect |
45 ms |
13404 KB |
Output isn't correct |
| 77 |
Runtime error |
56 ms |
26296 KB |
Execution killed with signal 11 |
| 78 |
Correct |
78 ms |
13456 KB |
Output is correct |
| 79 |
Incorrect |
120 ms |
13392 KB |
Output isn't correct |
| 80 |
Incorrect |
49 ms |
13400 KB |
Output isn't correct |
| 81 |
Incorrect |
63 ms |
13404 KB |
Output isn't correct |
| 82 |
Incorrect |
63 ms |
13404 KB |
Output isn't correct |
| 83 |
Correct |
85 ms |
13400 KB |
Output is correct |
| 84 |
Incorrect |
147 ms |
13144 KB |
Output isn't correct |
| 85 |
Incorrect |
52 ms |
13144 KB |
Output isn't correct |
| 86 |
Incorrect |
78 ms |
13148 KB |
Output isn't correct |
| 87 |
Incorrect |
77 ms |
13144 KB |
Output isn't correct |
| 88 |
Incorrect |
80 ms |
13144 KB |
Output isn't correct |
| 89 |
Incorrect |
77 ms |
13148 KB |
Output isn't correct |
| 90 |
Incorrect |
65 ms |
13144 KB |
Output isn't correct |
| 91 |
Incorrect |
81 ms |
13244 KB |
Output isn't correct |
| 92 |
Incorrect |
98 ms |
13464 KB |
Output isn't correct |
