| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 58200 |
2018-07-17T06:33:50 Z |
gnoor |
Mecho (IOI09_mecho) |
C++17 |
|
329 ms |
9760 KB |
#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;
if (disBee[start.r][start.c]<=x) return false;
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=n*n;
int mid;
while (lo<hi) {
mid=(lo+hi+1)>>1;
if (check(mid)) {
lo=mid;
} else {
hi=mid-1;
}
}
if (check(lo)) printf("%d\n",lo);
else printf("-1\n");
return 0;
}
Compilation message
mecho.cpp: In function 'int main()':
mecho.cpp:51:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d",&n,&s);
~~~~~^~~~~~~~~~~~~~
mecho.cpp:58:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf(" %c",&x);
~~~~~^~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
9 ms |
8312 KB |
Output is correct |
| 2 |
Correct |
12 ms |
8312 KB |
Output is correct |
| 3 |
Correct |
9 ms |
8368 KB |
Output is correct |
| 4 |
Correct |
9 ms |
8444 KB |
Output is correct |
| 5 |
Correct |
11 ms |
8520 KB |
Output is correct |
| 6 |
Correct |
12 ms |
8552 KB |
Output is correct |
| 7 |
Correct |
200 ms |
9368 KB |
Output is correct |
| 8 |
Correct |
10 ms |
9368 KB |
Output is correct |
| 9 |
Correct |
11 ms |
9368 KB |
Output is correct |
| 10 |
Correct |
10 ms |
9368 KB |
Output is correct |
| 11 |
Correct |
11 ms |
9368 KB |
Output is correct |
| 12 |
Correct |
13 ms |
9368 KB |
Output is correct |
| 13 |
Correct |
14 ms |
9368 KB |
Output is correct |
| 14 |
Correct |
15 ms |
9368 KB |
Output is correct |
| 15 |
Correct |
10 ms |
9368 KB |
Output is correct |
| 16 |
Correct |
13 ms |
9368 KB |
Output is correct |
| 17 |
Correct |
10 ms |
9368 KB |
Output is correct |
| 18 |
Correct |
10 ms |
9368 KB |
Output is correct |
| 19 |
Correct |
9 ms |
9368 KB |
Output is correct |
| 20 |
Correct |
10 ms |
9368 KB |
Output is correct |
| 21 |
Correct |
10 ms |
9368 KB |
Output is correct |
| 22 |
Correct |
13 ms |
9368 KB |
Output is correct |
| 23 |
Correct |
12 ms |
9368 KB |
Output is correct |
| 24 |
Correct |
11 ms |
9368 KB |
Output is correct |
| 25 |
Correct |
15 ms |
9368 KB |
Output is correct |
| 26 |
Correct |
13 ms |
9368 KB |
Output is correct |
| 27 |
Correct |
11 ms |
9368 KB |
Output is correct |
| 28 |
Correct |
14 ms |
9368 KB |
Output is correct |
| 29 |
Correct |
13 ms |
9368 KB |
Output is correct |
| 30 |
Correct |
12 ms |
9368 KB |
Output is correct |
| 31 |
Correct |
14 ms |
9368 KB |
Output is correct |
| 32 |
Correct |
13 ms |
9368 KB |
Output is correct |
| 33 |
Correct |
24 ms |
9368 KB |
Output is correct |
| 34 |
Correct |
22 ms |
9368 KB |
Output is correct |
| 35 |
Correct |
84 ms |
9368 KB |
Output is correct |
| 36 |
Correct |
25 ms |
9368 KB |
Output is correct |
| 37 |
Correct |
38 ms |
9368 KB |
Output is correct |
| 38 |
Correct |
85 ms |
9368 KB |
Output is correct |
| 39 |
Correct |
31 ms |
9368 KB |
Output is correct |
| 40 |
Correct |
50 ms |
9368 KB |
Output is correct |
| 41 |
Correct |
96 ms |
9368 KB |
Output is correct |
| 42 |
Correct |
34 ms |
9368 KB |
Output is correct |
| 43 |
Correct |
43 ms |
9368 KB |
Output is correct |
| 44 |
Correct |
130 ms |
9368 KB |
Output is correct |
| 45 |
Correct |
58 ms |
9368 KB |
Output is correct |
| 46 |
Correct |
40 ms |
9368 KB |
Output is correct |
| 47 |
Correct |
114 ms |
9368 KB |
Output is correct |
| 48 |
Correct |
41 ms |
9368 KB |
Output is correct |
| 49 |
Correct |
67 ms |
9368 KB |
Output is correct |
| 50 |
Correct |
150 ms |
9368 KB |
Output is correct |
| 51 |
Correct |
58 ms |
9368 KB |
Output is correct |
| 52 |
Correct |
68 ms |
9368 KB |
Output is correct |
| 53 |
Correct |
225 ms |
9368 KB |
Output is correct |
| 54 |
Correct |
53 ms |
9368 KB |
Output is correct |
| 55 |
Correct |
58 ms |
9368 KB |
Output is correct |
| 56 |
Correct |
223 ms |
9368 KB |
Output is correct |
| 57 |
Correct |
63 ms |
9368 KB |
Output is correct |
| 58 |
Correct |
86 ms |
9368 KB |
Output is correct |
| 59 |
Correct |
231 ms |
9368 KB |
Output is correct |
| 60 |
Correct |
62 ms |
9368 KB |
Output is correct |
| 61 |
Correct |
76 ms |
9520 KB |
Output is correct |
| 62 |
Correct |
329 ms |
9520 KB |
Output is correct |
| 63 |
Correct |
197 ms |
9520 KB |
Output is correct |
| 64 |
Correct |
327 ms |
9520 KB |
Output is correct |
| 65 |
Correct |
300 ms |
9520 KB |
Output is correct |
| 66 |
Correct |
248 ms |
9520 KB |
Output is correct |
| 67 |
Correct |
228 ms |
9520 KB |
Output is correct |
| 68 |
Correct |
119 ms |
9520 KB |
Output is correct |
| 69 |
Correct |
109 ms |
9520 KB |
Output is correct |
| 70 |
Correct |
163 ms |
9520 KB |
Output is correct |
| 71 |
Correct |
122 ms |
9520 KB |
Output is correct |
| 72 |
Correct |
93 ms |
9520 KB |
Output is correct |
| 73 |
Correct |
135 ms |
9740 KB |
Output is correct |
| 74 |
Correct |
203 ms |
9740 KB |
Output is correct |
| 75 |
Correct |
222 ms |
9740 KB |
Output is correct |
| 76 |
Correct |
191 ms |
9740 KB |
Output is correct |
| 77 |
Correct |
234 ms |
9760 KB |
Output is correct |
| 78 |
Correct |
190 ms |
9760 KB |
Output is correct |
| 79 |
Correct |
117 ms |
9760 KB |
Output is correct |
| 80 |
Correct |
136 ms |
9760 KB |
Output is correct |
| 81 |
Correct |
166 ms |
9760 KB |
Output is correct |
| 82 |
Correct |
162 ms |
9760 KB |
Output is correct |
| 83 |
Correct |
179 ms |
9760 KB |
Output is correct |
| 84 |
Correct |
173 ms |
9760 KB |
Output is correct |
| 85 |
Correct |
194 ms |
9760 KB |
Output is correct |
| 86 |
Correct |
190 ms |
9760 KB |
Output is correct |
| 87 |
Correct |
227 ms |
9760 KB |
Output is correct |
| 88 |
Correct |
195 ms |
9760 KB |
Output is correct |
| 89 |
Correct |
254 ms |
9760 KB |
Output is correct |
| 90 |
Correct |
217 ms |
9760 KB |
Output is correct |
| 91 |
Correct |
227 ms |
9760 KB |
Output is correct |
| 92 |
Correct |
203 ms |
9760 KB |
Output is correct |
