| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 629674 |
2022-08-14T21:37:47 Z |
54skyxenon |
Mecho (IOI09_mecho) |
Python 3 |
|
1000 ms |
27616 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')
bees_time = [[0] * n for _ in range(n)]
bees_visited = [[False] * 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
def mecho_reached(mecho_dis, bees_dis):
return mecho_dis // s < bees_dis
def ok(eating_time):
mecho_visited = [[False] * n for _ in range(n)]
mecho_time = [[0] * n for _ in range(n)]
Q = deque()
# 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):
if lo > hi:
return -1
mid = (lo + hi) // 2
if not ok(mid):
return bs(lo, mid - 1)
elif mid < hi and ok(mid + 1):
return bs(mid + 1, hi)
else:
return mid
print(bs(0, n ** 2))
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
17 ms |
3412 KB |
Output is correct |
| 2 |
Correct |
17 ms |
3412 KB |
Output is correct |
| 3 |
Correct |
17 ms |
3404 KB |
Output is correct |
| 4 |
Correct |
17 ms |
3412 KB |
Output is correct |
| 5 |
Correct |
29 ms |
3448 KB |
Output is correct |
| 6 |
Correct |
27 ms |
3404 KB |
Output is correct |
| 7 |
Execution timed out |
1076 ms |
15700 KB |
Time limit exceeded |
| 8 |
Correct |
19 ms |
3472 KB |
Output is correct |
| 9 |
Correct |
22 ms |
3420 KB |
Output is correct |
| 10 |
Correct |
23 ms |
3416 KB |
Output is correct |
| 11 |
Correct |
19 ms |
3440 KB |
Output is correct |
| 12 |
Correct |
28 ms |
3496 KB |
Output is correct |
| 13 |
Correct |
33 ms |
3452 KB |
Output is correct |
| 14 |
Correct |
43 ms |
3572 KB |
Output is correct |
| 15 |
Correct |
20 ms |
3412 KB |
Output is correct |
| 16 |
Correct |
25 ms |
3384 KB |
Output is correct |
| 17 |
Correct |
30 ms |
3388 KB |
Output is correct |
| 18 |
Correct |
26 ms |
3412 KB |
Output is correct |
| 19 |
Correct |
30 ms |
3384 KB |
Output is correct |
| 20 |
Correct |
31 ms |
3392 KB |
Output is correct |
| 21 |
Correct |
25 ms |
3540 KB |
Output is correct |
| 22 |
Correct |
26 ms |
3456 KB |
Output is correct |
| 23 |
Correct |
30 ms |
3444 KB |
Output is correct |
| 24 |
Correct |
34 ms |
3500 KB |
Output is correct |
| 25 |
Correct |
37 ms |
3516 KB |
Output is correct |
| 26 |
Correct |
45 ms |
3584 KB |
Output is correct |
| 27 |
Correct |
39 ms |
3608 KB |
Output is correct |
| 28 |
Correct |
53 ms |
3552 KB |
Output is correct |
| 29 |
Correct |
39 ms |
3532 KB |
Output is correct |
| 30 |
Correct |
52 ms |
3540 KB |
Output is correct |
| 31 |
Correct |
45 ms |
3680 KB |
Output is correct |
| 32 |
Correct |
66 ms |
3592 KB |
Output is correct |
| 33 |
Correct |
560 ms |
9880 KB |
Output is correct |
| 34 |
Correct |
696 ms |
10316 KB |
Output is correct |
| 35 |
Execution timed out |
1100 ms |
10924 KB |
Time limit exceeded |
| 36 |
Correct |
714 ms |
11836 KB |
Output is correct |
| 37 |
Correct |
994 ms |
12400 KB |
Output is correct |
| 38 |
Execution timed out |
1090 ms |
13480 KB |
Time limit exceeded |
| 39 |
Correct |
910 ms |
14196 KB |
Output is correct |
| 40 |
Execution timed out |
1091 ms |
14812 KB |
Time limit exceeded |
| 41 |
Execution timed out |
1072 ms |
16196 KB |
Time limit exceeded |
| 42 |
Execution timed out |
1089 ms |
16608 KB |
Time limit exceeded |
| 43 |
Execution timed out |
1093 ms |
17568 KB |
Time limit exceeded |
| 44 |
Execution timed out |
1099 ms |
18216 KB |
Time limit exceeded |
| 45 |
Execution timed out |
1091 ms |
19400 KB |
Time limit exceeded |
| 46 |
Execution timed out |
1098 ms |
20552 KB |
Time limit exceeded |
| 47 |
Execution timed out |
1097 ms |
18616 KB |
Time limit exceeded |
| 48 |
Execution timed out |
1087 ms |
22352 KB |
Time limit exceeded |
| 49 |
Execution timed out |
1097 ms |
23808 KB |
Time limit exceeded |
| 50 |
Execution timed out |
1088 ms |
15964 KB |
Time limit exceeded |
| 51 |
Execution timed out |
1094 ms |
25648 KB |
Time limit exceeded |
| 52 |
Execution timed out |
1094 ms |
24928 KB |
Time limit exceeded |
| 53 |
Execution timed out |
1090 ms |
16592 KB |
Time limit exceeded |
| 54 |
Execution timed out |
1079 ms |
27616 KB |
Time limit exceeded |
| 55 |
Execution timed out |
1088 ms |
20700 KB |
Time limit exceeded |
| 56 |
Execution timed out |
1097 ms |
17876 KB |
Time limit exceeded |
| 57 |
Execution timed out |
1094 ms |
21164 KB |
Time limit exceeded |
| 58 |
Execution timed out |
1096 ms |
21124 KB |
Time limit exceeded |
| 59 |
Execution timed out |
1085 ms |
19000 KB |
Time limit exceeded |
| 60 |
Execution timed out |
1090 ms |
22188 KB |
Time limit exceeded |
| 61 |
Execution timed out |
1088 ms |
21748 KB |
Time limit exceeded |
| 62 |
Execution timed out |
1092 ms |
19808 KB |
Time limit exceeded |
| 63 |
Execution timed out |
1088 ms |
21448 KB |
Time limit exceeded |
| 64 |
Execution timed out |
1085 ms |
21184 KB |
Time limit exceeded |
| 65 |
Execution timed out |
1091 ms |
21348 KB |
Time limit exceeded |
| 66 |
Execution timed out |
1090 ms |
20980 KB |
Time limit exceeded |
| 67 |
Execution timed out |
1096 ms |
21044 KB |
Time limit exceeded |
| 68 |
Execution timed out |
1079 ms |
14688 KB |
Time limit exceeded |
| 69 |
Execution timed out |
1065 ms |
14620 KB |
Time limit exceeded |
| 70 |
Execution timed out |
1089 ms |
14684 KB |
Time limit exceeded |
| 71 |
Execution timed out |
1089 ms |
14628 KB |
Time limit exceeded |
| 72 |
Execution timed out |
1084 ms |
14860 KB |
Time limit exceeded |
| 73 |
Execution timed out |
1081 ms |
18360 KB |
Time limit exceeded |
| 74 |
Execution timed out |
1081 ms |
18380 KB |
Time limit exceeded |
| 75 |
Execution timed out |
1084 ms |
18336 KB |
Time limit exceeded |
| 76 |
Execution timed out |
1091 ms |
18288 KB |
Time limit exceeded |
| 77 |
Execution timed out |
1085 ms |
18328 KB |
Time limit exceeded |
| 78 |
Execution timed out |
1087 ms |
17284 KB |
Time limit exceeded |
| 79 |
Execution timed out |
1058 ms |
17256 KB |
Time limit exceeded |
| 80 |
Execution timed out |
1060 ms |
17368 KB |
Time limit exceeded |
| 81 |
Execution timed out |
1082 ms |
17628 KB |
Time limit exceeded |
| 82 |
Execution timed out |
1090 ms |
17336 KB |
Time limit exceeded |
| 83 |
Execution timed out |
1088 ms |
17252 KB |
Time limit exceeded |
| 84 |
Execution timed out |
1085 ms |
17172 KB |
Time limit exceeded |
| 85 |
Execution timed out |
1094 ms |
17152 KB |
Time limit exceeded |
| 86 |
Execution timed out |
1086 ms |
17288 KB |
Time limit exceeded |
| 87 |
Execution timed out |
1091 ms |
17184 KB |
Time limit exceeded |
| 88 |
Execution timed out |
1090 ms |
16432 KB |
Time limit exceeded |
| 89 |
Execution timed out |
1090 ms |
16492 KB |
Time limit exceeded |
| 90 |
Execution timed out |
1090 ms |
16708 KB |
Time limit exceeded |
| 91 |
Execution timed out |
1092 ms |
16412 KB |
Time limit exceeded |
| 92 |
Execution timed out |
1098 ms |
16524 KB |
Time limit exceeded |
