#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;
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=n*n;
int ans=-1;
while(ll<=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;
}
}
if(mid<dist1[honx][hony]){
dist2[honx][hony]=0;
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];
double dss=dist2[i][j]+1;
dss/=s;
int ds=ceil(dss);
if(safe(x,y) && (mat[x][y]=='G'|| mat[x][y]=='D')&& !vis2[x][y] &&(ds<(dist1[x][y]-mid))){
dist2[x][y]=dist2[i][j]+1;
vis2[x][y]=true;
q.push({x,y});
}
}
}
bool reached=false;
for(int i=0;i<4;i++){
int x=homex+di[i];
int y=homey+dj[i];
if(safe(x,y) && vis2[x][y]){
double dss=dist2[x][y];
dss/=s;
int ds=ceil(dss);
if(ds<(dist1[x][y]-mid)){
reached=true;}
}
}
if(reached){
ans=mid;
ll=mid+1;
}
else{
//ans=mid;
rr=mid-1;
}
}
cout<<ll<<endl;
}
Compilation message
mecho.cpp: In function 'int32_t main()':
mecho.cpp:52:21: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
52 | const auto &[i,j]=q.front();
| ^
mecho.cpp:83:21: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
83 | const auto &[i,j]=q.front();
| ^
mecho.cpp:66:9: warning: variable 'ans' set but not used [-Wunused-but-set-variable]
66 | int ans=-1;
| ^~~
mecho.cpp:78:30: warning: 'hony' may be used uninitialized in this function [-Wmaybe-uninitialized]
78 | dist2[honx][hony]=0;
| ~~~~~~~~~~~~~~~~~^~
mecho.cpp:102:13: warning: 'homey' may be used uninitialized in this function [-Wmaybe-uninitialized]
102 | int y=homey+dj[i];
| ^
mecho.cpp:101:13: warning: 'homex' may be used uninitialized in this function [-Wmaybe-uninitialized]
101 | int x=homex+di[i];
| ^
mecho.cpp:78:30: warning: 'honx' may be used uninitialized in this function [-Wmaybe-uninitialized]
78 | dist2[honx][hony]=0;
| ~~~~~~~~~~~~~~~~~^~
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
0 ms |
344 KB |
Output isn't correct |
| 2 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
| 3 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
| 4 |
Incorrect |
0 ms |
600 KB |
Output isn't correct |
| 5 |
Correct |
0 ms |
348 KB |
Output is correct |
| 6 |
Correct |
0 ms |
348 KB |
Output is correct |
| 7 |
Correct |
101 ms |
12552 KB |
Output is correct |
| 8 |
Incorrect |
1 ms |
344 KB |
Output isn't 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 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
| 13 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
| 14 |
Incorrect |
1 ms |
348 KB |
Output isn't correct |
| 15 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
| 16 |
Correct |
1 ms |
348 KB |
Output is correct |
| 17 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
| 18 |
Correct |
0 ms |
348 KB |
Output is correct |
| 19 |
Incorrect |
1 ms |
348 KB |
Output isn't correct |
| 20 |
Correct |
0 ms |
348 KB |
Output is correct |
| 21 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
| 22 |
Correct |
1 ms |
348 KB |
Output is correct |
| 23 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
| 24 |
Correct |
0 ms |
348 KB |
Output is correct |
| 25 |
Incorrect |
0 ms |
344 KB |
Output isn't correct |
| 26 |
Correct |
0 ms |
348 KB |
Output is correct |
| 27 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
| 28 |
Correct |
0 ms |
348 KB |
Output is correct |
| 29 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
| 30 |
Correct |
1 ms |
348 KB |
Output is correct |
| 31 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
| 32 |
Correct |
1 ms |
344 KB |
Output is correct |
| 33 |
Incorrect |
5 ms |
2652 KB |
Output isn't correct |
| 34 |
Correct |
6 ms |
2652 KB |
Output is correct |
| 35 |
Correct |
20 ms |
2648 KB |
Output is correct |
| 36 |
Incorrect |
6 ms |
3420 KB |
Output isn't correct |
| 37 |
Correct |
7 ms |
3420 KB |
Output is correct |
| 38 |
Correct |
28 ms |
3420 KB |
Output is correct |
| 39 |
Incorrect |
8 ms |
4176 KB |
Output isn't correct |
| 40 |
Correct |
9 ms |
4184 KB |
Output is correct |
| 41 |
Correct |
36 ms |
4188 KB |
Output is correct |
| 42 |
Incorrect |
10 ms |
4952 KB |
Output isn't correct |
| 43 |
Correct |
12 ms |
5212 KB |
Output is correct |
| 44 |
Correct |
44 ms |
5152 KB |
Output is correct |
| 45 |
Incorrect |
12 ms |
5980 KB |
Output isn't correct |
| 46 |
Correct |
14 ms |
6072 KB |
Output is correct |
| 47 |
Correct |
51 ms |
5976 KB |
Output is correct |
| 48 |
Incorrect |
15 ms |
7000 KB |
Output isn't correct |
| 49 |
Correct |
15 ms |
7000 KB |
Output is correct |
| 50 |
Correct |
81 ms |
7384 KB |
Output is correct |
| 51 |
Incorrect |
18 ms |
8280 KB |
Output isn't correct |
| 52 |
Correct |
19 ms |
8308 KB |
Output is correct |
| 53 |
Correct |
82 ms |
8304 KB |
Output is correct |
| 54 |
Incorrect |
20 ms |
9304 KB |
Output isn't correct |
| 55 |
Correct |
21 ms |
9304 KB |
Output is correct |
| 56 |
Correct |
91 ms |
9560 KB |
Output is correct |
| 57 |
Incorrect |
22 ms |
10844 KB |
Output isn't correct |
| 58 |
Correct |
26 ms |
10844 KB |
Output is correct |
| 59 |
Correct |
116 ms |
10840 KB |
Output is correct |
| 60 |
Incorrect |
25 ms |
12120 KB |
Output isn't correct |
| 61 |
Correct |
29 ms |
12124 KB |
Output is correct |
| 62 |
Correct |
122 ms |
12340 KB |
Output is correct |
| 63 |
Correct |
87 ms |
12120 KB |
Output is correct |
| 64 |
Correct |
170 ms |
12336 KB |
Output is correct |
| 65 |
Correct |
125 ms |
12120 KB |
Output is correct |
| 66 |
Incorrect |
108 ms |
12124 KB |
Output isn't correct |
| 67 |
Incorrect |
103 ms |
12124 KB |
Output isn't correct |
| 68 |
Correct |
52 ms |
12896 KB |
Output is correct |
| 69 |
Correct |
41 ms |
12388 KB |
Output is correct |
| 70 |
Correct |
42 ms |
12380 KB |
Output is correct |
| 71 |
Correct |
39 ms |
12376 KB |
Output is correct |
| 72 |
Incorrect |
32 ms |
12380 KB |
Output isn't correct |
| 73 |
Runtime error |
37 ms |
25648 KB |
Execution killed with signal 11 |
| 74 |
Runtime error |
34 ms |
25652 KB |
Execution killed with signal 11 |
| 75 |
Correct |
75 ms |
12892 KB |
Output is correct |
| 76 |
Correct |
65 ms |
12892 KB |
Output is correct |
| 77 |
Runtime error |
63 ms |
25656 KB |
Execution killed with signal 11 |
| 78 |
Incorrect |
81 ms |
12636 KB |
Output isn't correct |
| 79 |
Correct |
48 ms |
12632 KB |
Output is correct |
| 80 |
Correct |
58 ms |
12632 KB |
Output is correct |
| 81 |
Correct |
77 ms |
12632 KB |
Output is correct |
| 82 |
Correct |
58 ms |
12636 KB |
Output is correct |
| 83 |
Correct |
75 ms |
12744 KB |
Output is correct |
| 84 |
Correct |
72 ms |
12752 KB |
Output is correct |
| 85 |
Correct |
89 ms |
12636 KB |
Output is correct |
| 86 |
Correct |
80 ms |
12756 KB |
Output is correct |
| 87 |
Correct |
71 ms |
12632 KB |
Output is correct |
| 88 |
Correct |
76 ms |
12636 KB |
Output is correct |
| 89 |
Correct |
83 ms |
12664 KB |
Output is correct |
| 90 |
Correct |
87 ms |
12632 KB |
Output is correct |
| 91 |
Correct |
83 ms |
12648 KB |
Output is correct |
| 92 |
Correct |
84 ms |
12652 KB |
Output is correct |
