| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 629669 |
2022-08-14T21:31:28 Z |
54skyxenon |
Mecho (IOI09_mecho) |
PyPy 3 |
|
1000 ms |
65536 KB |
# https://oj.uz/problem/view/IOI09_mecho
from collections import deque
n, s = map(int, input().split())
forest = []
for _ in range(n):
forest.append(input())
start = None
end = None
hives = []
for i in range(n):
for j in range(n):
if forest[i][j] == 'M':
start = (i, j)
if forest[i][j] == 'D':
end = (i, j)
if forest[i][j] == 'H':
hives.append((i, j))
def valid_square(x, y):
return 0 <= x < n and 0 <= y < n and (forest[x][y] == 'G' or forest[x][y] == 'M')
def mecho_reached(mecho_dis, bees_dis):
return mecho_dis // s < bees_dis
def ok(eating_time):
bees_visited = [[False] * n for _ in range(n)]
mecho_visited = [[False] * n for _ in range(n)]
bees_time = [[0] * n for _ in range(n)]
mecho_time = [[0] * n for _ in range(n)]
Q = deque()
# move bees
for hive_x, hive_y in hives:
Q.append((hive_x, hive_y))
bees_visited[hive_x][hive_y] = True
while Q:
x, y = Q.popleft()
for nx, ny in [(x + 1, y), (x - 1, y), (x, y + 1), (x, y - 1)]:
if valid_square(nx, ny) and not bees_visited[nx][ny]:
bees_time[nx][ny] = bees_time[x][y] + 1
Q.append((nx, ny))
bees_visited[nx][ny] = True
# move Mecho
Q.append(start)
mecho_visited[start[0]][start[1]] = True
if bees_time[start[0]][start[1]] <= eating_time:
Q.popleft()
while Q:
x, y = Q.popleft()
for nx, ny in [(x + 1, y), (x - 1, y), (x, y + 1), (x, y - 1)]:
'''
check if mecho reaces node[x][y] before the bees by dividing the time mecho takes to reach a node by s, since mecho walks s steps at a time.
subtract the eating time from the time taken for the bees to reach the node, because that time was used by mecho for eating
'''
if valid_square(nx, ny) and not mecho_visited[nx][ny] and mecho_reached(mecho_time[x][y] + 1, bees_time[nx][ny] - eating_time):
mecho_visited[nx][ny] = True
Q.append((nx, ny))
mecho_time[nx][ny] = mecho_time[x][y] + 1
# check if mecho reached a node surrounding his cave before the bees
for nx, ny in [(end[0] + 1, end[1]), (end[0] - 1, end[1]), (end[0], end[1] + 1), (end[0], end[1] - 1)]:
if valid_square(nx, ny) and mecho_reached(mecho_time[nx][ny], bees_time[nx][ny] - eating_time) and mecho_visited[nx][ny]:
return True
return False
def bs(lo, hi):
while lo < hi:
mid = (lo + hi) // 2
if ok(mid):
lo = mid
else:
hi = mid - 1
if lo > hi:
return -1
return lo
print(bs(0, n ** 2))
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Execution timed out |
1086 ms |
29848 KB |
Time limit exceeded |
| 2 |
Execution timed out |
1089 ms |
29184 KB |
Time limit exceeded |
| 3 |
Correct |
42 ms |
18668 KB |
Output is correct |
| 4 |
Execution timed out |
1090 ms |
29480 KB |
Time limit exceeded |
| 5 |
Correct |
50 ms |
18544 KB |
Output is correct |
| 6 |
Execution timed out |
1083 ms |
30056 KB |
Time limit exceeded |
| 7 |
Runtime error |
640 ms |
65536 KB |
Execution killed with signal 9 |
| 8 |
Correct |
56 ms |
20008 KB |
Output is correct |
| 9 |
Execution timed out |
1095 ms |
31096 KB |
Time limit exceeded |
| 10 |
Execution timed out |
1088 ms |
30752 KB |
Time limit exceeded |
| 11 |
Correct |
61 ms |
20216 KB |
Output is correct |
| 12 |
Correct |
83 ms |
22184 KB |
Output is correct |
| 13 |
Correct |
69 ms |
21660 KB |
Output is correct |
| 14 |
Correct |
118 ms |
23552 KB |
Output is correct |
| 15 |
Correct |
58 ms |
20264 KB |
Output is correct |
| 16 |
Execution timed out |
1087 ms |
29860 KB |
Time limit exceeded |
| 17 |
Correct |
71 ms |
20820 KB |
Output is correct |
| 18 |
Execution timed out |
1090 ms |
30200 KB |
Time limit exceeded |
| 19 |
Correct |
70 ms |
20824 KB |
Output is correct |
| 20 |
Execution timed out |
1089 ms |
30076 KB |
Time limit exceeded |
| 21 |
Execution timed out |
1094 ms |
27720 KB |
Time limit exceeded |
| 22 |
Correct |
90 ms |
22884 KB |
Output is correct |
| 23 |
Execution timed out |
1094 ms |
27464 KB |
Time limit exceeded |
| 24 |
Correct |
91 ms |
22604 KB |
Output is correct |
| 25 |
Correct |
88 ms |
23868 KB |
Output is correct |
| 26 |
Execution timed out |
1095 ms |
27716 KB |
Time limit exceeded |
| 27 |
Execution timed out |
1089 ms |
27592 KB |
Time limit exceeded |
| 28 |
Correct |
87 ms |
23972 KB |
Output is correct |
| 29 |
Execution timed out |
1092 ms |
27840 KB |
Time limit exceeded |
| 30 |
Execution timed out |
1095 ms |
27856 KB |
Time limit exceeded |
| 31 |
Execution timed out |
1051 ms |
27504 KB |
Time limit exceeded |
| 32 |
Execution timed out |
1056 ms |
27680 KB |
Time limit exceeded |
| 33 |
Execution timed out |
1077 ms |
31644 KB |
Time limit exceeded |
| 34 |
Correct |
322 ms |
31860 KB |
Output is correct |
| 35 |
Execution timed out |
1093 ms |
30988 KB |
Time limit exceeded |
| 36 |
Execution timed out |
1083 ms |
33928 KB |
Time limit exceeded |
| 37 |
Correct |
420 ms |
33952 KB |
Output is correct |
| 38 |
Execution timed out |
1099 ms |
33516 KB |
Time limit exceeded |
| 39 |
Correct |
439 ms |
36724 KB |
Output is correct |
| 40 |
Correct |
491 ms |
34444 KB |
Output is correct |
| 41 |
Execution timed out |
1046 ms |
37120 KB |
Time limit exceeded |
| 42 |
Execution timed out |
1095 ms |
39448 KB |
Time limit exceeded |
| 43 |
Correct |
587 ms |
39428 KB |
Output is correct |
| 44 |
Execution timed out |
1089 ms |
40424 KB |
Time limit exceeded |
| 45 |
Correct |
602 ms |
39920 KB |
Output is correct |
| 46 |
Execution timed out |
1101 ms |
41340 KB |
Time limit exceeded |
| 47 |
Execution timed out |
1089 ms |
43080 KB |
Time limit exceeded |
| 48 |
Execution timed out |
1089 ms |
43816 KB |
Time limit exceeded |
| 49 |
Execution timed out |
1100 ms |
46292 KB |
Time limit exceeded |
| 50 |
Execution timed out |
1086 ms |
46784 KB |
Time limit exceeded |
| 51 |
Correct |
891 ms |
43924 KB |
Output is correct |
| 52 |
Execution timed out |
1099 ms |
49244 KB |
Time limit exceeded |
| 53 |
Execution timed out |
1091 ms |
50648 KB |
Time limit exceeded |
| 54 |
Execution timed out |
1096 ms |
51520 KB |
Time limit exceeded |
| 55 |
Execution timed out |
1062 ms |
50492 KB |
Time limit exceeded |
| 56 |
Execution timed out |
1099 ms |
55044 KB |
Time limit exceeded |
| 57 |
Execution timed out |
1090 ms |
50376 KB |
Time limit exceeded |
| 58 |
Execution timed out |
1062 ms |
59536 KB |
Time limit exceeded |
| 59 |
Execution timed out |
1086 ms |
52888 KB |
Time limit exceeded |
| 60 |
Execution timed out |
1099 ms |
53860 KB |
Time limit exceeded |
| 61 |
Execution timed out |
1099 ms |
58392 KB |
Time limit exceeded |
| 62 |
Execution timed out |
1100 ms |
60804 KB |
Time limit exceeded |
| 63 |
Execution timed out |
1097 ms |
61312 KB |
Time limit exceeded |
| 64 |
Execution timed out |
1090 ms |
60244 KB |
Time limit exceeded |
| 65 |
Execution timed out |
1081 ms |
53948 KB |
Time limit exceeded |
| 66 |
Execution timed out |
1099 ms |
61528 KB |
Time limit exceeded |
| 67 |
Execution timed out |
1100 ms |
53416 KB |
Time limit exceeded |
| 68 |
Runtime error |
423 ms |
65536 KB |
Execution killed with signal 9 |
| 69 |
Runtime error |
481 ms |
65536 KB |
Execution killed with signal 9 |
| 70 |
Runtime error |
427 ms |
65536 KB |
Execution killed with signal 9 |
| 71 |
Runtime error |
433 ms |
65536 KB |
Execution killed with signal 9 |
| 72 |
Runtime error |
422 ms |
65536 KB |
Execution killed with signal 9 |
| 73 |
Execution timed out |
1094 ms |
65224 KB |
Time limit exceeded |
| 74 |
Execution timed out |
1094 ms |
65468 KB |
Time limit exceeded |
| 75 |
Execution timed out |
1088 ms |
65172 KB |
Time limit exceeded |
| 76 |
Execution timed out |
1083 ms |
65484 KB |
Time limit exceeded |
| 77 |
Execution timed out |
1083 ms |
65464 KB |
Time limit exceeded |
| 78 |
Runtime error |
959 ms |
65536 KB |
Execution killed with signal 9 |
| 79 |
Runtime error |
388 ms |
65536 KB |
Execution killed with signal 9 |
| 80 |
Execution timed out |
1098 ms |
65412 KB |
Time limit exceeded |
| 81 |
Runtime error |
917 ms |
65536 KB |
Execution killed with signal 9 |
| 82 |
Runtime error |
948 ms |
65536 KB |
Execution killed with signal 9 |
| 83 |
Execution timed out |
1075 ms |
65532 KB |
Time limit exceeded |
| 84 |
Runtime error |
408 ms |
65536 KB |
Execution killed with signal 9 |
| 85 |
Runtime error |
387 ms |
65536 KB |
Execution killed with signal 9 |
| 86 |
Execution timed out |
1095 ms |
65340 KB |
Time limit exceeded |
| 87 |
Execution timed out |
1099 ms |
65440 KB |
Time limit exceeded |
| 88 |
Runtime error |
375 ms |
65536 KB |
Execution killed with signal 9 |
| 89 |
Runtime error |
369 ms |
65536 KB |
Execution killed with signal 9 |
| 90 |
Execution timed out |
1095 ms |
65536 KB |
Time limit exceeded |
| 91 |
Runtime error |
562 ms |
65536 KB |
Execution killed with signal 9 |
| 92 |
Runtime error |
968 ms |
65536 KB |
Execution killed with signal 9 |
