#include <cstdio>
#include <algorithm>
#include <vector>
#include <queue>
#include <cstring>
using namespace std;
struct cell {
int r,c;
};
queue<cell> bee;
queue<cell> bear;
bool wall[1010][1010];
int disBear[1010][1010];
int disBee[1010][1010];
cell home;
cell start;
int di[4][2]={{0,-1},{0,1},{-1,0},{1,0}};
int n,s;
bool check(int x) {
memset(disBear,63,sizeof(disBear));
disBear[start.r][start.c]=x*s;
bear.push(start);
int nowr,nowc,nextr,nextc;
while (!bear.empty()) {
nowr=bear.front().r;
nowc=bear.front().c;
bear.pop();
for (int i=0;i<4;i++) {
nextr=nowr+di[i][0];
nextc=nowc+di[i][1];
if (nextc<0||nextc>=n||nextr<0||nextr>=n) continue;
if (wall[nextr][nextc]) continue;
if (disBear[nextr][nextc]<=disBear[nowr][nowc]+1) continue;
if (disBee[nextr][nextc]<=(disBear[nowr][nowc]+1)/s) continue;
disBear[nextr][nextc]=disBear[nowr][nowc]+1;
bear.push(cell{nextr,nextc});
}
}
return disBear[home.r][home.c]!=0x3f3f3f3f;
}
int main () {
scanf("%d%d",&n,&s);
char x;
memset(disBee,63,sizeof(disBee));
for (int i=0;i<n;i++) {
for (int j=0;j<n;j++) {
scanf(" %c",&x);
if (x=='T') wall[i][j]=true;
else if (x=='M'){
start=cell{i,j};
}
else if (x=='D') home=cell{i,j};
else if (x=='H') {
bee.push(cell{i,j});
disBee[i][j]=0;
}
}
}
int nowr,nowc;
int nextr,nextc;
while (!bee.empty()) {
nowr=bee.front().r;
nowc=bee.front().c;
bee.pop();
for (int i=0;i<4;i++) {
nextr=nowr+di[i][0];
nextc=nowc+di[i][1];
if (nextc<0||nextc>=n||nextr<0||nextr>=n) continue;
if (wall[nextr][nextc]) continue;
if (nextr==home.r&&nextc==home.c) continue;
if (disBee[nextr][nextc]<=disBee[nowr][nowc]+1) continue;
disBee[nextr][nextc]=disBee[nowr][nowc]+1;
bee.push(cell{nextr,nextc});
}
}
int lo=0;
int hi=2*n;
int mid;
while (lo<hi) {
mid=(lo+hi+1)>>1;
if (check(mid)) {
lo=mid;
} else {
hi=mid-1;
}
}
printf("%d\n",lo);
return 0;
}
Compilation message
mecho.cpp: In function 'int main()':
mecho.cpp:50:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d",&n,&s);
~~~~~^~~~~~~~~~~~~~
mecho.cpp:57:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf(" %c",&x);
~~~~~^~~~~~~~~~
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
11 ms |
8312 KB |
Output is correct |
| 2 |
Correct |
8 ms |
8424 KB |
Output is correct |
| 3 |
Correct |
8 ms |
8424 KB |
Output is correct |
| 4 |
Correct |
8 ms |
8424 KB |
Output is correct |
| 5 |
Correct |
11 ms |
8424 KB |
Output is correct |
| 6 |
Correct |
12 ms |
8424 KB |
Output is correct |
| 7 |
Correct |
166 ms |
9332 KB |
Output is correct |
| 8 |
Incorrect |
10 ms |
9332 KB |
Output isn't correct |
| 9 |
Correct |
10 ms |
9332 KB |
Output is correct |
| 10 |
Correct |
11 ms |
9332 KB |
Output is correct |
| 11 |
Correct |
9 ms |
9332 KB |
Output is correct |
| 12 |
Incorrect |
9 ms |
9332 KB |
Output isn't correct |
| 13 |
Incorrect |
10 ms |
9332 KB |
Output isn't correct |
| 14 |
Incorrect |
9 ms |
9332 KB |
Output isn't correct |
| 15 |
Incorrect |
10 ms |
9332 KB |
Output isn't correct |
| 16 |
Incorrect |
12 ms |
9332 KB |
Output isn't correct |
| 17 |
Incorrect |
10 ms |
9332 KB |
Output isn't correct |
| 18 |
Incorrect |
11 ms |
9332 KB |
Output isn't correct |
| 19 |
Incorrect |
9 ms |
9332 KB |
Output isn't correct |
| 20 |
Incorrect |
9 ms |
9332 KB |
Output isn't correct |
| 21 |
Incorrect |
10 ms |
9332 KB |
Output isn't correct |
| 22 |
Incorrect |
9 ms |
9332 KB |
Output isn't correct |
| 23 |
Incorrect |
12 ms |
9332 KB |
Output isn't correct |
| 24 |
Incorrect |
12 ms |
9332 KB |
Output isn't correct |
| 25 |
Incorrect |
12 ms |
9332 KB |
Output isn't correct |
| 26 |
Incorrect |
13 ms |
9332 KB |
Output isn't correct |
| 27 |
Incorrect |
10 ms |
9332 KB |
Output isn't correct |
| 28 |
Incorrect |
10 ms |
9332 KB |
Output isn't correct |
| 29 |
Incorrect |
13 ms |
9332 KB |
Output isn't correct |
| 30 |
Incorrect |
10 ms |
9332 KB |
Output isn't correct |
| 31 |
Incorrect |
13 ms |
9332 KB |
Output isn't correct |
| 32 |
Incorrect |
10 ms |
9332 KB |
Output isn't correct |
| 33 |
Incorrect |
26 ms |
9332 KB |
Output isn't correct |
| 34 |
Incorrect |
66 ms |
9332 KB |
Output isn't correct |
| 35 |
Correct |
69 ms |
9332 KB |
Output is correct |
| 36 |
Incorrect |
36 ms |
9332 KB |
Output isn't correct |
| 37 |
Incorrect |
42 ms |
9332 KB |
Output isn't correct |
| 38 |
Correct |
51 ms |
9332 KB |
Output is correct |
| 39 |
Incorrect |
38 ms |
9332 KB |
Output isn't correct |
| 40 |
Incorrect |
49 ms |
9332 KB |
Output isn't correct |
| 41 |
Correct |
65 ms |
9332 KB |
Output is correct |
| 42 |
Incorrect |
44 ms |
9332 KB |
Output isn't correct |
| 43 |
Incorrect |
62 ms |
9332 KB |
Output isn't correct |
| 44 |
Correct |
81 ms |
9332 KB |
Output is correct |
| 45 |
Incorrect |
77 ms |
9332 KB |
Output isn't correct |
| 46 |
Incorrect |
73 ms |
9332 KB |
Output isn't correct |
| 47 |
Correct |
91 ms |
9332 KB |
Output is correct |
| 48 |
Incorrect |
83 ms |
9332 KB |
Output isn't correct |
| 49 |
Incorrect |
85 ms |
9332 KB |
Output isn't correct |
| 50 |
Correct |
145 ms |
9332 KB |
Output is correct |
| 51 |
Incorrect |
91 ms |
9332 KB |
Output isn't correct |
| 52 |
Incorrect |
97 ms |
9332 KB |
Output isn't correct |
| 53 |
Correct |
217 ms |
9340 KB |
Output is correct |
| 54 |
Incorrect |
109 ms |
9340 KB |
Output isn't correct |
| 55 |
Incorrect |
143 ms |
9340 KB |
Output isn't correct |
| 56 |
Correct |
199 ms |
9360 KB |
Output is correct |
| 57 |
Incorrect |
92 ms |
9360 KB |
Output isn't correct |
| 58 |
Incorrect |
135 ms |
9360 KB |
Output isn't correct |
| 59 |
Correct |
197 ms |
9360 KB |
Output is correct |
| 60 |
Incorrect |
102 ms |
9360 KB |
Output isn't correct |
| 61 |
Incorrect |
171 ms |
9396 KB |
Output isn't correct |
| 62 |
Correct |
278 ms |
9516 KB |
Output is correct |
| 63 |
Correct |
175 ms |
9516 KB |
Output is correct |
| 64 |
Correct |
293 ms |
9516 KB |
Output is correct |
| 65 |
Correct |
336 ms |
9516 KB |
Output is correct |
| 66 |
Correct |
276 ms |
9516 KB |
Output is correct |
| 67 |
Incorrect |
271 ms |
9640 KB |
Output isn't correct |
| 68 |
Correct |
116 ms |
9640 KB |
Output is correct |
| 69 |
Correct |
91 ms |
9640 KB |
Output is correct |
| 70 |
Correct |
108 ms |
9640 KB |
Output is correct |
| 71 |
Correct |
96 ms |
9640 KB |
Output is correct |
| 72 |
Incorrect |
91 ms |
9640 KB |
Output isn't correct |
| 73 |
Incorrect |
88 ms |
9640 KB |
Output isn't correct |
| 74 |
Correct |
128 ms |
9640 KB |
Output is correct |
| 75 |
Correct |
125 ms |
9720 KB |
Output is correct |
| 76 |
Correct |
113 ms |
9720 KB |
Output is correct |
| 77 |
Correct |
132 ms |
9720 KB |
Output is correct |
| 78 |
Incorrect |
168 ms |
9720 KB |
Output isn't correct |
| 79 |
Correct |
117 ms |
9720 KB |
Output is correct |
| 80 |
Correct |
161 ms |
9720 KB |
Output is correct |
| 81 |
Correct |
188 ms |
9720 KB |
Output is correct |
| 82 |
Correct |
163 ms |
9720 KB |
Output is correct |
| 83 |
Correct |
151 ms |
9720 KB |
Output is correct |
| 84 |
Correct |
137 ms |
9720 KB |
Output is correct |
| 85 |
Correct |
183 ms |
9720 KB |
Output is correct |
| 86 |
Correct |
223 ms |
9720 KB |
Output is correct |
| 87 |
Correct |
172 ms |
9720 KB |
Output is correct |
| 88 |
Correct |
151 ms |
9720 KB |
Output is correct |
| 89 |
Correct |
170 ms |
9720 KB |
Output is correct |
| 90 |
Correct |
163 ms |
9720 KB |
Output is correct |
| 91 |
Correct |
169 ms |
9720 KB |
Output is correct |
| 92 |
Correct |
187 ms |
9720 KB |
Output is correct |
